The constitutional rights of 'benefactor children' and 'saviour siblings' to bodily intergrity and autonomy
- Authors: Du Plessis, Emma Kate
- Date: 2011
- Subjects: Children's rights , Civil rights , Genetic engineering
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10283 , http://hdl.handle.net/10948/d1010420 , Children's rights , Civil rights , Genetic engineering
- Description: In modern society, children are acknowledged as bearers of both children‟s rights and all other rights in the Bill of Rights which generally apply to children. One important right, outside of section 28, is that of bodily integrity or the right to control and decide what happens to their body. Therefore, children theoretically have the right to consent to medical treatment and surgery. However, children are generally deemed to lack the necessary maturity to make decisions of this nature and require parental consent before any medical procedure may be performed. Following the enactment of the Children‟s Act 38 of 2005, the age of consent for medical intervention was lowered to the uniform age of twelve. Children above the age of twelve are recognised as having the capacity to make their own decisions in respect of bodily integrity, whereas those under twelve still require parental consent. While this may be a positive evelopment, it is potentially problematic for two groups of children, known as „benefactor children‟ and „saviour siblings‟. In the last 50 years, there has been a noticeable advancement in the field of genetic research. One such development is the possibility of creating one child to save the life of another through tissue or organ donation. This has provided options to parents of children with life threatening conditions where before, there was little hope of a cure. Now, at the request of these parents, children can be specifically “genetically engineered” as an embryo, to become a tissue or organ match to a sick sibling. These children are known as „saviour siblings‟. Another group of children has emerged. While not the result of “genetic engineering”, they serve a similar purpose in being potential life-saving donors to an ill sibling and are known as „benefactor children‟. Both categories of children enjoy the protection of fundamental rights. For those who are under twelve years of age however, the right to bodily integrity can be infringed upon by the proposed surgical removal of organs or tissue for the benefit of a sick sibling, based purely on a parent‟s consent. At stake too, is the right to reproductive autonomy. Parents bear children for a number of different reasons, which can include raising a child to save the life of another. As they have the right to reproductive autonomy, adults are able to decide when they want children and for what reason they want children, which can include the various techniques used to bring about „saviour siblings‟. However, as rights are mutually interrelated and nterdependent, they cannot be viewed in isolation. Therefore, it must be asked: does a person‟s right to reproductive autonomy, as guaranteed by the Constitution, justify interference with an embryo? As an embryo is not recognised in South African law as a legal subject, it will be difficult to justify interference with this right on this basis. The right to consent to medical intervention only from age twelve was described as potentially problematic for „benefactor children‟ and „saviour siblings‟, as parents with seriously ill children may become so emotionally burdened, that they place the welfare of the sick child over that of the healthy child. Thus, it is possible that parents will consent to any and all procedures on the „benefactor child‟ or „saviour sibling‟, regardless of the implications to the health and suffering of the healthy child. Section 28(2) of the Constitution states that the child‟s best interests are of paramount importance but, it must be asked, whose best interests are more important when more than one child is involved? As this is a decision parents are incapable of making at that time, the decision should be made by a neutral, impartial and unemotional third party such as the Court, which can be assisted by the Family Advocate and an ombudsman, who are experts in assisting children and promoting their best interests. Presently, South African law does not expressly address „saviour siblings‟. However, with few changes to the National Health Act and other Regulations, this is an area which could be regulated in time. These changes could include finalising the draft regulations as well as providing a list of the medical and dental purposes for which blood and tissue can be removed and should make specific reference to the removal of tissue, blood or blood products to treat a sick sibling. It is also imperative that South Africa regulates these matters now, as „saviour siblings‟ are no longer simply a matter for the future. Furthermore, legislation needs to be amended and enacted to prevent the law from becoming out-dated and redundant, leaving „benefactor children‟ and „saviour siblings‟ vulnerable while law is being drafted. In that international law is silent on the matter, South Africa would be well advised to consider foreign law such as the United Kingdom, in developing its law. As the United Kingdom has developed a National Board, so too should South Africa, as this would assist in regulating „saviour siblings‟ by allowing members to review each proposed case of „saviour siblings‟. This is merely one recommendation of several which could facilitate a smooth, controlled regulation of a highly emotional topic. Children remain one of the most vulnerable groups in society and their rights are often susceptible to infringement or abuse. It is incumbent on the law to ensure that, wherever possible, these rights are protected, especially as science continues to advance and it becomes more difficult to determine what is morally correct.
- Full Text:
- Date Issued: 2011
- Authors: Du Plessis, Emma Kate
- Date: 2011
- Subjects: Children's rights , Civil rights , Genetic engineering
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10283 , http://hdl.handle.net/10948/d1010420 , Children's rights , Civil rights , Genetic engineering
- Description: In modern society, children are acknowledged as bearers of both children‟s rights and all other rights in the Bill of Rights which generally apply to children. One important right, outside of section 28, is that of bodily integrity or the right to control and decide what happens to their body. Therefore, children theoretically have the right to consent to medical treatment and surgery. However, children are generally deemed to lack the necessary maturity to make decisions of this nature and require parental consent before any medical procedure may be performed. Following the enactment of the Children‟s Act 38 of 2005, the age of consent for medical intervention was lowered to the uniform age of twelve. Children above the age of twelve are recognised as having the capacity to make their own decisions in respect of bodily integrity, whereas those under twelve still require parental consent. While this may be a positive evelopment, it is potentially problematic for two groups of children, known as „benefactor children‟ and „saviour siblings‟. In the last 50 years, there has been a noticeable advancement in the field of genetic research. One such development is the possibility of creating one child to save the life of another through tissue or organ donation. This has provided options to parents of children with life threatening conditions where before, there was little hope of a cure. Now, at the request of these parents, children can be specifically “genetically engineered” as an embryo, to become a tissue or organ match to a sick sibling. These children are known as „saviour siblings‟. Another group of children has emerged. While not the result of “genetic engineering”, they serve a similar purpose in being potential life-saving donors to an ill sibling and are known as „benefactor children‟. Both categories of children enjoy the protection of fundamental rights. For those who are under twelve years of age however, the right to bodily integrity can be infringed upon by the proposed surgical removal of organs or tissue for the benefit of a sick sibling, based purely on a parent‟s consent. At stake too, is the right to reproductive autonomy. Parents bear children for a number of different reasons, which can include raising a child to save the life of another. As they have the right to reproductive autonomy, adults are able to decide when they want children and for what reason they want children, which can include the various techniques used to bring about „saviour siblings‟. However, as rights are mutually interrelated and nterdependent, they cannot be viewed in isolation. Therefore, it must be asked: does a person‟s right to reproductive autonomy, as guaranteed by the Constitution, justify interference with an embryo? As an embryo is not recognised in South African law as a legal subject, it will be difficult to justify interference with this right on this basis. The right to consent to medical intervention only from age twelve was described as potentially problematic for „benefactor children‟ and „saviour siblings‟, as parents with seriously ill children may become so emotionally burdened, that they place the welfare of the sick child over that of the healthy child. Thus, it is possible that parents will consent to any and all procedures on the „benefactor child‟ or „saviour sibling‟, regardless of the implications to the health and suffering of the healthy child. Section 28(2) of the Constitution states that the child‟s best interests are of paramount importance but, it must be asked, whose best interests are more important when more than one child is involved? As this is a decision parents are incapable of making at that time, the decision should be made by a neutral, impartial and unemotional third party such as the Court, which can be assisted by the Family Advocate and an ombudsman, who are experts in assisting children and promoting their best interests. Presently, South African law does not expressly address „saviour siblings‟. However, with few changes to the National Health Act and other Regulations, this is an area which could be regulated in time. These changes could include finalising the draft regulations as well as providing a list of the medical and dental purposes for which blood and tissue can be removed and should make specific reference to the removal of tissue, blood or blood products to treat a sick sibling. It is also imperative that South Africa regulates these matters now, as „saviour siblings‟ are no longer simply a matter for the future. Furthermore, legislation needs to be amended and enacted to prevent the law from becoming out-dated and redundant, leaving „benefactor children‟ and „saviour siblings‟ vulnerable while law is being drafted. In that international law is silent on the matter, South Africa would be well advised to consider foreign law such as the United Kingdom, in developing its law. As the United Kingdom has developed a National Board, so too should South Africa, as this would assist in regulating „saviour siblings‟ by allowing members to review each proposed case of „saviour siblings‟. This is merely one recommendation of several which could facilitate a smooth, controlled regulation of a highly emotional topic. Children remain one of the most vulnerable groups in society and their rights are often susceptible to infringement or abuse. It is incumbent on the law to ensure that, wherever possible, these rights are protected, especially as science continues to advance and it becomes more difficult to determine what is morally correct.
- Full Text:
- Date Issued: 2011
Effects of selected modes of digital distribution on music consumerism, with reference to the album format
- Authors: Du Preez, Liska
- Date: 2011
- Subjects: Sound -- Recording and reproducing -- Digital techniques , Music -- Technological innovations , Music and the Internet
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8504 , http://hdl.handle.net/10948/1427 , Sound -- Recording and reproducing -- Digital techniques , Music -- Technological innovations , Music and the Internet
- Description: In this digital age many listeners of music now purchase albums from online digital music stores instead of buying a physical album from the record store. This has created a concern with many regarding the future of the album as a physical medium. This study investigates the impact of the possible death of the album on certain listening habits, the activity of record collecting, the creation of large-scale musical works, music consumerism, and its implications for the creative process on music as art and sound-recording quality. Three realisations have led to the problem statement. Firstly, the album might not have a future in the digital age. Secondly, downloadable songs might not be able to recreate an album experience. The third realisation is that the possible death of the album could create new, exciting challenges to artists as they strive to create art. This study is exploratory in nature - and no hypothesis was generated. The research necessitates qualitative, exploratory, descriptive and contextual approaches. Furthermore, the investigation has led to the collection of mostly new data, constituting a “primary data design” through the implementation of qualitative listening experiments and a focus group, using full-time NMMU students between 18 and 25 years of age. It is herein argued that digital distribution might possibly have an effect on the perception of the album format and might possibly still be a relevant listening experience, valued by young people. Singles and albums are collectable; and good albums are considered artistic and comparable to the large-scale musical works of the past. If the concept of an album does not die out, then high fidelity formats should be able to re-invent the album experience. Listening experiences other than the album experience do exist, and they could generate new ways for artists to create musical art.
- Full Text:
- Date Issued: 2011
- Authors: Du Preez, Liska
- Date: 2011
- Subjects: Sound -- Recording and reproducing -- Digital techniques , Music -- Technological innovations , Music and the Internet
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8504 , http://hdl.handle.net/10948/1427 , Sound -- Recording and reproducing -- Digital techniques , Music -- Technological innovations , Music and the Internet
- Description: In this digital age many listeners of music now purchase albums from online digital music stores instead of buying a physical album from the record store. This has created a concern with many regarding the future of the album as a physical medium. This study investigates the impact of the possible death of the album on certain listening habits, the activity of record collecting, the creation of large-scale musical works, music consumerism, and its implications for the creative process on music as art and sound-recording quality. Three realisations have led to the problem statement. Firstly, the album might not have a future in the digital age. Secondly, downloadable songs might not be able to recreate an album experience. The third realisation is that the possible death of the album could create new, exciting challenges to artists as they strive to create art. This study is exploratory in nature - and no hypothesis was generated. The research necessitates qualitative, exploratory, descriptive and contextual approaches. Furthermore, the investigation has led to the collection of mostly new data, constituting a “primary data design” through the implementation of qualitative listening experiments and a focus group, using full-time NMMU students between 18 and 25 years of age. It is herein argued that digital distribution might possibly have an effect on the perception of the album format and might possibly still be a relevant listening experience, valued by young people. Singles and albums are collectable; and good albums are considered artistic and comparable to the large-scale musical works of the past. If the concept of an album does not die out, then high fidelity formats should be able to re-invent the album experience. Listening experiences other than the album experience do exist, and they could generate new ways for artists to create musical art.
- Full Text:
- Date Issued: 2011
An analysis of the elements of genocide with reference to the South African farmer's case
- Authors: Du Toit, Johanna Helena
- Date: 2011
- Subjects: Genocide -- South Africa , Human rights -- South Africa , Farmers -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10168 , http://hdl.handle.net/10948/1568 , Genocide -- South Africa , Human rights -- South Africa , Farmers -- South Africa
- Description: The definition of genocide encompasses not only the killing of a protected group as is so often erroneously believed, but also inter alia the causing of serious bodily and mental harm to a group and deliberately inflicting conditions of life on a group calculated to bring about its destruction in whole or in part. Eight stages have been identified through which conventional genocide goes. There is a closed list of four groups named in the Genocide Convention in respect of which genocide can be perpetrated. Problems have been experienced with the classification and the determination whether a group should qualify or not. In answer to this problem, the definition of the groups should be seen cohesively and attempts should preferably not be made to compartmentalise any group suspected of being targeted for genocide. The special intent required for genocide sets it apart from other crimes against humanity. The intention that needs to be proven is the desire to exterminate a group as such in whole or in part. The mention of “in part” opens the door for genocide to be perpetrated against a small sub-group which conforms to the definition of a group. The white Afrikaner farmer forms part of the larger white Afrikaner group residing in South Africa. Incitement to genocide is an inchoate crime and is regarded as a lesser crime reflected in lower sentences being passed for incitement than for genocide itself. The requirements are that the incitement must be direct and public. The required intention to incite must also be proven for a conviction to follow. The farmer who laid the complaint with the International Criminal Court, did so in the hope that the Prosecutor would utilise his or her proprio motu powers to instigate an investigation in South Africa regarding white Afrikaner farmers. The complaint and petition as well as the statistics used by the farmer paint the picture of incitement to genocide and possible genocide. The allegations are not specific and will have to be proven in a court of law for any such finding to follow. , Abstract
- Full Text:
- Date Issued: 2011
- Authors: Du Toit, Johanna Helena
- Date: 2011
- Subjects: Genocide -- South Africa , Human rights -- South Africa , Farmers -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10168 , http://hdl.handle.net/10948/1568 , Genocide -- South Africa , Human rights -- South Africa , Farmers -- South Africa
- Description: The definition of genocide encompasses not only the killing of a protected group as is so often erroneously believed, but also inter alia the causing of serious bodily and mental harm to a group and deliberately inflicting conditions of life on a group calculated to bring about its destruction in whole or in part. Eight stages have been identified through which conventional genocide goes. There is a closed list of four groups named in the Genocide Convention in respect of which genocide can be perpetrated. Problems have been experienced with the classification and the determination whether a group should qualify or not. In answer to this problem, the definition of the groups should be seen cohesively and attempts should preferably not be made to compartmentalise any group suspected of being targeted for genocide. The special intent required for genocide sets it apart from other crimes against humanity. The intention that needs to be proven is the desire to exterminate a group as such in whole or in part. The mention of “in part” opens the door for genocide to be perpetrated against a small sub-group which conforms to the definition of a group. The white Afrikaner farmer forms part of the larger white Afrikaner group residing in South Africa. Incitement to genocide is an inchoate crime and is regarded as a lesser crime reflected in lower sentences being passed for incitement than for genocide itself. The requirements are that the incitement must be direct and public. The required intention to incite must also be proven for a conviction to follow. The farmer who laid the complaint with the International Criminal Court, did so in the hope that the Prosecutor would utilise his or her proprio motu powers to instigate an investigation in South Africa regarding white Afrikaner farmers. The complaint and petition as well as the statistics used by the farmer paint the picture of incitement to genocide and possible genocide. The allegations are not specific and will have to be proven in a court of law for any such finding to follow. , Abstract
- Full Text:
- Date Issued: 2011
The principal factor : examining the role of principals in the success of their schools
- Authors: Dubula, Nomvuyo Mildred
- Date: 2011
- Subjects: School principals -- Training of -- South Africa -- Eastern Cape , School improvement programs -- South Africa -- Eastern Cape , Educational leadership -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8240 , http://hdl.handle.net/10948/d1010881 , School principals -- Training of -- South Africa -- Eastern Cape , School improvement programs -- South Africa -- Eastern Cape , Educational leadership -- South Africa -- Eastern Cape
- Description: In this Treatise, a study is undertaken to analyse and examine the role of school principals in the success of their schools; with specific reference to township high schools in the Port Elizabeth district (P.E. district). The study assumes that P.E. district principals, as leaders and managers should deliver essential services effectively, efficiently, and with optimal use of resources to attain maximum results in school performance. The same is expected of their counterparts in any part of the country, it is not exclusively demanded from PE district principals. In terms of the current education legislation and policy framework, the principals have to account for the performance of their schools. To this end the National Department of Education introduced legislation in 2007 to ensure that principals account to the Head of The Department of Education of the relevant province. Section 16 A of the South African Schools Act (SASA) was introduced by the Education Law Amendment Act 31/2007. The provisions of this section deal with “the functions and responsibilities of principals of public schools.” Specifically section 16A (1) (b) states that “The principal must prepare and submit to the Head of the Department an annual report in respect of: (i.) The academic performance of that school (ii.) The effective use of available resources.” Since the enactment of section 16 A as referred to above, the Provincial Departments have begun to make principals account for the success or failure of learners, for human resource development, financial management, parent involvement in school matters and the active participation of school governing bodies. What should be clear is that the above encompasses all the critical and fundamental aspects that have an impact on the progress of any educational institution. The combination of the two requirements stated above reflects the extent to which the Department of Education is committed to making certain that principals in their respective schools create an environment where learners can achieve their full potential. It is such creation of conducive environments that will enable all learners in the country to achieve equal opportunities in society irrespective of their original backgrounds. This ideal is consistent with section 9 of the Constitution, 1996 which provides for the right to equality of all people. The research, also assumes that leadership is about direction and purpose, while management lays emphasis on effectiveness and efficiency. Leadership and management are fundamental aspects of those duties and responsibilities associated with the position of a school principal. It is further postulated that, a good principal understands that circumstances determine the proportion of each of these elements that is required by any given situation i.e. whether more of leadership or bigger dose management is appropriate in dealing with a certain set of circumstances or not. The study identifies variables that make a school principal a strong leader and good manager and lists the following as the critical focus areas: Balancing instructional and managerial leadership Strengthening the connection between school and home Developing effective leadership Effective teaching practices Staff development The study also assumes that township schools are no exception to those in different parts of the country. Despite some serious daily challenges peculiar to the township situations, these schools still have to perform satisfactorily like all other institutions of learning. The legislative and policy framework applies equally to all schools. The study argues primarily that all schools can perform well and develop the potential of their learners to the fullest. The difference lies in the leadership and management of the respective institutions by their principals. All stakeholders are presumed to posses the potential, the ability and the urge to do their utmost best to render quality services that would lead to the attainment of excellent results. It is worthwhile for the system that those who show themselves to lack these attributes should be identified, not to weed them out but to assist so that they acquire the necessary skills and expertise. After all it is by strengthening the weakest link that a chain becomes strong.
- Full Text:
- Date Issued: 2011
- Authors: Dubula, Nomvuyo Mildred
- Date: 2011
- Subjects: School principals -- Training of -- South Africa -- Eastern Cape , School improvement programs -- South Africa -- Eastern Cape , Educational leadership -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8240 , http://hdl.handle.net/10948/d1010881 , School principals -- Training of -- South Africa -- Eastern Cape , School improvement programs -- South Africa -- Eastern Cape , Educational leadership -- South Africa -- Eastern Cape
- Description: In this Treatise, a study is undertaken to analyse and examine the role of school principals in the success of their schools; with specific reference to township high schools in the Port Elizabeth district (P.E. district). The study assumes that P.E. district principals, as leaders and managers should deliver essential services effectively, efficiently, and with optimal use of resources to attain maximum results in school performance. The same is expected of their counterparts in any part of the country, it is not exclusively demanded from PE district principals. In terms of the current education legislation and policy framework, the principals have to account for the performance of their schools. To this end the National Department of Education introduced legislation in 2007 to ensure that principals account to the Head of The Department of Education of the relevant province. Section 16 A of the South African Schools Act (SASA) was introduced by the Education Law Amendment Act 31/2007. The provisions of this section deal with “the functions and responsibilities of principals of public schools.” Specifically section 16A (1) (b) states that “The principal must prepare and submit to the Head of the Department an annual report in respect of: (i.) The academic performance of that school (ii.) The effective use of available resources.” Since the enactment of section 16 A as referred to above, the Provincial Departments have begun to make principals account for the success or failure of learners, for human resource development, financial management, parent involvement in school matters and the active participation of school governing bodies. What should be clear is that the above encompasses all the critical and fundamental aspects that have an impact on the progress of any educational institution. The combination of the two requirements stated above reflects the extent to which the Department of Education is committed to making certain that principals in their respective schools create an environment where learners can achieve their full potential. It is such creation of conducive environments that will enable all learners in the country to achieve equal opportunities in society irrespective of their original backgrounds. This ideal is consistent with section 9 of the Constitution, 1996 which provides for the right to equality of all people. The research, also assumes that leadership is about direction and purpose, while management lays emphasis on effectiveness and efficiency. Leadership and management are fundamental aspects of those duties and responsibilities associated with the position of a school principal. It is further postulated that, a good principal understands that circumstances determine the proportion of each of these elements that is required by any given situation i.e. whether more of leadership or bigger dose management is appropriate in dealing with a certain set of circumstances or not. The study identifies variables that make a school principal a strong leader and good manager and lists the following as the critical focus areas: Balancing instructional and managerial leadership Strengthening the connection between school and home Developing effective leadership Effective teaching practices Staff development The study also assumes that township schools are no exception to those in different parts of the country. Despite some serious daily challenges peculiar to the township situations, these schools still have to perform satisfactorily like all other institutions of learning. The legislative and policy framework applies equally to all schools. The study argues primarily that all schools can perform well and develop the potential of their learners to the fullest. The difference lies in the leadership and management of the respective institutions by their principals. All stakeholders are presumed to posses the potential, the ability and the urge to do their utmost best to render quality services that would lead to the attainment of excellent results. It is worthwhile for the system that those who show themselves to lack these attributes should be identified, not to weed them out but to assist so that they acquire the necessary skills and expertise. After all it is by strengthening the weakest link that a chain becomes strong.
- Full Text:
- Date Issued: 2011
Professional nurses experiences of a team nursing care framework in critical care units in a private healthcare group
- Authors: Dunsdon, Jeananne
- Date: 2011
- Subjects: Intensive care nursing -- South Africa , Intensive care units -- South Africa , Team nursing -- South Africa , Nurses -- Job stress -- South Africa
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: vital:10022 , http://hdl.handle.net/10948/1444 , Intensive care nursing -- South Africa , Intensive care units -- South Africa , Team nursing -- South Africa , Nurses -- Job stress -- South Africa
- Description: A critical care unit is a dynamic and highly technological environment. Professional nurses who have been working in the critical care unit for a period of time are passionate about the environment in which they work. They find their on duty time challenging and stimulating. The critical care environment is slowly changing. Due to the fact that there are fewer professional nurses with an additional qualification in critical care available to work in the critical care units. The utilisation of an increasing number of agency nurses leads to an increase in sub-standard nursing care as well as dissatisfied doctors and patients. The shortage of critical care staff has resulted in the need to find an alternative human resources framework and still provide cost effective, safe quality patient care. This leads to the design and implementation of a team nursing care framework for critical care. The research objectives for this study were: - To explore and describe the experiences of professional nurses with regard to a team nursing care framework in private critical care units. - Develop guidelines to optimize the team nursing care framework in critical care units in a private hospital group. The research is based on a qualitative, explorative, descriptive and contextual research design. The study is based on a phenomenological approach to inquiry. Eleven in-depth semi structured face-to-face phenomenological interviews were utilized as the main means of collecting data. A purposive, criterion based, sampling method was used. Specific inclusion criteria were met and consent was obtained from the participants and from the management of the private clinic where the research was conducted. Two central themes were identified:- Theme One: The professional nurses experienced the team nursing care framework in the critical care unit as a burden. Six sub-themes were identified. - Theme Two: Professional nurses made recommendations for improvement of the team nursing care framework in the critical care unit. By describing the lived experiences of the professional nurses in the critical care units, based on research interviews, the researcher painted a clear picture of the team nursing care framework in the critical care unit. Guidelines were developed based on the identified themes. The broad guidelines are aimed at ensuring that the nurses are competent to care for critical care patients prior to them commencing work in the critical care unit. The researcher concludes this study by making recommendations for Nursing practice, education and research.
- Full Text:
- Date Issued: 2011
- Authors: Dunsdon, Jeananne
- Date: 2011
- Subjects: Intensive care nursing -- South Africa , Intensive care units -- South Africa , Team nursing -- South Africa , Nurses -- Job stress -- South Africa
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: vital:10022 , http://hdl.handle.net/10948/1444 , Intensive care nursing -- South Africa , Intensive care units -- South Africa , Team nursing -- South Africa , Nurses -- Job stress -- South Africa
- Description: A critical care unit is a dynamic and highly technological environment. Professional nurses who have been working in the critical care unit for a period of time are passionate about the environment in which they work. They find their on duty time challenging and stimulating. The critical care environment is slowly changing. Due to the fact that there are fewer professional nurses with an additional qualification in critical care available to work in the critical care units. The utilisation of an increasing number of agency nurses leads to an increase in sub-standard nursing care as well as dissatisfied doctors and patients. The shortage of critical care staff has resulted in the need to find an alternative human resources framework and still provide cost effective, safe quality patient care. This leads to the design and implementation of a team nursing care framework for critical care. The research objectives for this study were: - To explore and describe the experiences of professional nurses with regard to a team nursing care framework in private critical care units. - Develop guidelines to optimize the team nursing care framework in critical care units in a private hospital group. The research is based on a qualitative, explorative, descriptive and contextual research design. The study is based on a phenomenological approach to inquiry. Eleven in-depth semi structured face-to-face phenomenological interviews were utilized as the main means of collecting data. A purposive, criterion based, sampling method was used. Specific inclusion criteria were met and consent was obtained from the participants and from the management of the private clinic where the research was conducted. Two central themes were identified:- Theme One: The professional nurses experienced the team nursing care framework in the critical care unit as a burden. Six sub-themes were identified. - Theme Two: Professional nurses made recommendations for improvement of the team nursing care framework in the critical care unit. By describing the lived experiences of the professional nurses in the critical care units, based on research interviews, the researcher painted a clear picture of the team nursing care framework in the critical care unit. Guidelines were developed based on the identified themes. The broad guidelines are aimed at ensuring that the nurses are competent to care for critical care patients prior to them commencing work in the critical care unit. The researcher concludes this study by making recommendations for Nursing practice, education and research.
- Full Text:
- Date Issued: 2011
The design of a visitor education and research centre for Sutherland, Western Cape
- Du Toit, David Jacob Johannes
- Authors: Du Toit, David Jacob Johannes
- Date: 2011
- Subjects: Visitors' centers -- South Africa -- Western Cape -- Designs and plans Visitors' centers -- South Africa -- Western Cape
- Language: English
- Type: Thesis , Masters , MArch
- Identifier: http://hdl.handle.net/10948/38934 , vital:35014
- Description: The modern visitor centre evolved rapidly with the world wide growth in tourism and its significant contribution to local economies. This new building type has provided many new opportunities for architects to work on small to medium size building with a greater meaning attached to them. However, architects would now have to deal with the problems that tourists bring! How must architects incorporate local history, culture and memory? The visitor centre is the combination of the local tourism office and museum. This new type of building is a combination of those formerly distinct building types which had two separate and different functions. “gateway building” The contemporary visitor centre combines the distribution of tourist/visitor information with the interpretation of particular regions. This interpretation of cultural and natural history links the visitor centre to the local history museum, however whereas local history museums often struggle with expanding collections, limited resources and low visitation levels, visitor centres have been able to attract greater government funding. The media of interpretation also differs dramatically, with visitor’s centres often using multimedia technology to enliven cultural history or educational displays. However they can also suffer from static displays which having been viewed once, discourage repeat visits. What is a contemporary visitor centre? Figure 1: Guggenheim Museum, Bilbao. Showing centre as “icon” building. This interpretation role of visitor centres has resulted in them becoming a major focus for visitation. The must-see status of these buildings is often pursued through dramatic form. Briefs for visitor centres often demand an “icon” envisaging that the building will itself, become a marketable destination. Buildings that try and become destinations in themself often run the risk of not promoting the area or location but rather them self. Visitor centres can therefor contribute to the transformation of destinations in both positive and negative ways. They can either help with economic, environmental and cultural revival of regions or they can be involved in changing places and overshadowing the very features they are meant to enhance.
- Full Text:
- Date Issued: 2011
- Authors: Du Toit, David Jacob Johannes
- Date: 2011
- Subjects: Visitors' centers -- South Africa -- Western Cape -- Designs and plans Visitors' centers -- South Africa -- Western Cape
- Language: English
- Type: Thesis , Masters , MArch
- Identifier: http://hdl.handle.net/10948/38934 , vital:35014
- Description: The modern visitor centre evolved rapidly with the world wide growth in tourism and its significant contribution to local economies. This new building type has provided many new opportunities for architects to work on small to medium size building with a greater meaning attached to them. However, architects would now have to deal with the problems that tourists bring! How must architects incorporate local history, culture and memory? The visitor centre is the combination of the local tourism office and museum. This new type of building is a combination of those formerly distinct building types which had two separate and different functions. “gateway building” The contemporary visitor centre combines the distribution of tourist/visitor information with the interpretation of particular regions. This interpretation of cultural and natural history links the visitor centre to the local history museum, however whereas local history museums often struggle with expanding collections, limited resources and low visitation levels, visitor centres have been able to attract greater government funding. The media of interpretation also differs dramatically, with visitor’s centres often using multimedia technology to enliven cultural history or educational displays. However they can also suffer from static displays which having been viewed once, discourage repeat visits. What is a contemporary visitor centre? Figure 1: Guggenheim Museum, Bilbao. Showing centre as “icon” building. This interpretation role of visitor centres has resulted in them becoming a major focus for visitation. The must-see status of these buildings is often pursued through dramatic form. Briefs for visitor centres often demand an “icon” envisaging that the building will itself, become a marketable destination. Buildings that try and become destinations in themself often run the risk of not promoting the area or location but rather them self. Visitor centres can therefor contribute to the transformation of destinations in both positive and negative ways. They can either help with economic, environmental and cultural revival of regions or they can be involved in changing places and overshadowing the very features they are meant to enhance.
- Full Text:
- Date Issued: 2011
An investigation into the implementation of the basic antenatal care programme by midwives in Mdantsane clinics
- Authors: Dyeli, Nolwando
- Date: 2011
- Subjects: Primary health care -- South Africa -- Eastern Cape , Midwifery -- South Africa -- Eastern Cape , Childbirth -- South Africa -- Eastern Cape , Midwives -- South Africa -- Eastern Cape , Pregnancy -- South Africa -- Eastern Cape , Prenatal care -- South Africa -- Eastern Cape , Pregnant women -- Health and hygiene -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Nursing Science)
- Identifier: vital:11897 , http://hdl.handle.net/10353/425 , Primary health care -- South Africa -- Eastern Cape , Midwifery -- South Africa -- Eastern Cape , Childbirth -- South Africa -- Eastern Cape , Midwives -- South Africa -- Eastern Cape , Pregnancy -- South Africa -- Eastern Cape , Prenatal care -- South Africa -- Eastern Cape , Pregnant women -- Health and hygiene -- South Africa -- Eastern Cape
- Description: Basic Antenatal Care (BANC) is a way of training or upgrading the knowledge and skills of all nurses, midwives and doctors involved in antenatal care at the primary health care level so that the minimum care can be provided effectively. This study was conducted to investigate the implementation of the BANC program by midwives in the Mdantsane clinics during February 2009. Methods: A descriptive study design was undertaken targeting midwives providing antenatal care to pregnant women, in 14 clinics of Mdantsane. Data was collected from 25 midwives in the clinics, and from 140 ANC cards of women attending ANC on the day of their visit to the clinic. Results: The majority of midwives providing BANC in Mdantsane clinics were not trained in BANC. There were 10 trained midwives and 15 not yet trained. A total of twenty five midwives were involved in the study. The number of visits according to the BANC schedule was well known by the midwives in the study. The content of the visits was well known for the first visit, but for subsequent visits, the participating midwives could not state exactly what they do on these visits. They perceived BANC as something beneficial for both midwives and pregnant women with 24 of the participating midwives rating BANC as advantageous. In completing an ANC card, the midwives scored between 48 percent and 100 percent. Under examination, they scored between 52 percent and 100 percent. Lastly on interpretation and decision making, they scored between 0 percent and 92 percent. This could have troubling consequences for the health status of the mother and baby. Weaknesses in providing antenatal care identified in the study included participating midwives failing to fill in the last normal menstrual period (LNMP) and the estimated date of delivery (EDD), which was a worrying observation. Plotting of the gestational age at first visit was also not carried out well as only 47 percent of the midwives in the study did this, meaning that there would be a miscalculation of the gestational age thereafter throughout the pregnancies. The body mass index (BMI) was not calculated as the maternal height and weight were not written on the ANC card. This should be completed in order to check the nutritional status of the pregnant woman to help supplement, if malnourished, and educate on diet, if overweight. Only 17 percent of the midwives in the study plotted the foetal presentation. Failure to plot foetal presentation could lead to complications during delivery because women with abnormal presentations could end up delivering in a clinic instead of the hospital.Conclusion: This study showed that even though midwives are implementing BANC among pregnant women, it is not being carried out correctly. Therefore the programme will not be as beneficial as it would be if put into practice correctly. This is highlighted by the lack of knowledge from the untrained midwives regarding the content of care on subsequent visits. Thus there is an urgent need for BANC training to be conducted and monitored at various sites.
- Full Text:
- Date Issued: 2011
- Authors: Dyeli, Nolwando
- Date: 2011
- Subjects: Primary health care -- South Africa -- Eastern Cape , Midwifery -- South Africa -- Eastern Cape , Childbirth -- South Africa -- Eastern Cape , Midwives -- South Africa -- Eastern Cape , Pregnancy -- South Africa -- Eastern Cape , Prenatal care -- South Africa -- Eastern Cape , Pregnant women -- Health and hygiene -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Nursing Science)
- Identifier: vital:11897 , http://hdl.handle.net/10353/425 , Primary health care -- South Africa -- Eastern Cape , Midwifery -- South Africa -- Eastern Cape , Childbirth -- South Africa -- Eastern Cape , Midwives -- South Africa -- Eastern Cape , Pregnancy -- South Africa -- Eastern Cape , Prenatal care -- South Africa -- Eastern Cape , Pregnant women -- Health and hygiene -- South Africa -- Eastern Cape
- Description: Basic Antenatal Care (BANC) is a way of training or upgrading the knowledge and skills of all nurses, midwives and doctors involved in antenatal care at the primary health care level so that the minimum care can be provided effectively. This study was conducted to investigate the implementation of the BANC program by midwives in the Mdantsane clinics during February 2009. Methods: A descriptive study design was undertaken targeting midwives providing antenatal care to pregnant women, in 14 clinics of Mdantsane. Data was collected from 25 midwives in the clinics, and from 140 ANC cards of women attending ANC on the day of their visit to the clinic. Results: The majority of midwives providing BANC in Mdantsane clinics were not trained in BANC. There were 10 trained midwives and 15 not yet trained. A total of twenty five midwives were involved in the study. The number of visits according to the BANC schedule was well known by the midwives in the study. The content of the visits was well known for the first visit, but for subsequent visits, the participating midwives could not state exactly what they do on these visits. They perceived BANC as something beneficial for both midwives and pregnant women with 24 of the participating midwives rating BANC as advantageous. In completing an ANC card, the midwives scored between 48 percent and 100 percent. Under examination, they scored between 52 percent and 100 percent. Lastly on interpretation and decision making, they scored between 0 percent and 92 percent. This could have troubling consequences for the health status of the mother and baby. Weaknesses in providing antenatal care identified in the study included participating midwives failing to fill in the last normal menstrual period (LNMP) and the estimated date of delivery (EDD), which was a worrying observation. Plotting of the gestational age at first visit was also not carried out well as only 47 percent of the midwives in the study did this, meaning that there would be a miscalculation of the gestational age thereafter throughout the pregnancies. The body mass index (BMI) was not calculated as the maternal height and weight were not written on the ANC card. This should be completed in order to check the nutritional status of the pregnant woman to help supplement, if malnourished, and educate on diet, if overweight. Only 17 percent of the midwives in the study plotted the foetal presentation. Failure to plot foetal presentation could lead to complications during delivery because women with abnormal presentations could end up delivering in a clinic instead of the hospital.Conclusion: This study showed that even though midwives are implementing BANC among pregnant women, it is not being carried out correctly. Therefore the programme will not be as beneficial as it would be if put into practice correctly. This is highlighted by the lack of knowledge from the untrained midwives regarding the content of care on subsequent visits. Thus there is an urgent need for BANC training to be conducted and monitored at various sites.
- Full Text:
- Date Issued: 2011
Assessing the impact of unions and related barriers in lean manufacturing implementation within Eastern Cape automotive component suppliers
- Authors: Ebrahim, Zahier
- Date: 2011
- Subjects: Lean manufacturing , Motor industry -- South Africa -- Eastern Cape , Labor unions -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8791 , http://hdl.handle.net/10948/d1015690
- Description: Lean manufacturing provides a fundamental basis for competitiveness in the auto component sector. The implementation and sustainability of the lean philosophy are important aspects when deciding on the adoption of the lean concept within organisations. Various barriers to implementation present themselves during and after lean implementation. These barriers are often related and in some instances they may be converted from an impediment into an enabler of lean within companies. The impact of unions as a negative or positive influence forms a central focus of this research. The influences on the perception of unions and their constituents are studied in relation to other barriers in order to determine their relevance in the Eastern Cape auto sector. A research questionnaire was constructed in line with the selected research design. The application of triangulation in the research design allows for greater depth in the responses from the participants in this research. The quantitative analysis combined with the qualitative thematic analysis provides an excellent means to explore and understand these selected barriers to lean in great detail. It can be concluded that automotive trade unions in the Eastern Cape are a barrier to implementation; however the factor that influences lean the most is the incorrect perception of lean due to ineffective leadership practices among organisational and union leaders, among other barriers. The impact of unions on the acceptance of a lean culture has far-reaching implications for the auto sector that requires a specific implementation approach in order to change perceptions and gain the requisite interest alignment among unions and their constituents.
- Full Text:
- Date Issued: 2011
- Authors: Ebrahim, Zahier
- Date: 2011
- Subjects: Lean manufacturing , Motor industry -- South Africa -- Eastern Cape , Labor unions -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8791 , http://hdl.handle.net/10948/d1015690
- Description: Lean manufacturing provides a fundamental basis for competitiveness in the auto component sector. The implementation and sustainability of the lean philosophy are important aspects when deciding on the adoption of the lean concept within organisations. Various barriers to implementation present themselves during and after lean implementation. These barriers are often related and in some instances they may be converted from an impediment into an enabler of lean within companies. The impact of unions as a negative or positive influence forms a central focus of this research. The influences on the perception of unions and their constituents are studied in relation to other barriers in order to determine their relevance in the Eastern Cape auto sector. A research questionnaire was constructed in line with the selected research design. The application of triangulation in the research design allows for greater depth in the responses from the participants in this research. The quantitative analysis combined with the qualitative thematic analysis provides an excellent means to explore and understand these selected barriers to lean in great detail. It can be concluded that automotive trade unions in the Eastern Cape are a barrier to implementation; however the factor that influences lean the most is the incorrect perception of lean due to ineffective leadership practices among organisational and union leaders, among other barriers. The impact of unions on the acceptance of a lean culture has far-reaching implications for the auto sector that requires a specific implementation approach in order to change perceptions and gain the requisite interest alignment among unions and their constituents.
- Full Text:
- Date Issued: 2011
Nanostructures and metallophthalocyanines : applications in microbial fuel cells
- Authors: Edwards, Sean
- Date: 2011
- Subjects: Microbial fuel cells , Waste products as fuel , Nanostructured materials , Electrochemistry , Nanotubes
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4107 , http://hdl.handle.net/10962/d1011742 , Microbial fuel cells , Waste products as fuel , Nanostructured materials , Electrochemistry , Nanotubes
- Description: Microbial fuel cells (MFCs) are a promising form of alternative energy capable of harnessing the potential energy stores in organic waste. The oxygen reduction reaction (ORR) forms an integral role in the generation of electricity in MFCs however it is also a potential obstacle in enhancing the performance of MFCs. Platinum, a commonly used catalyst for the ORR, is expensive and rare. Significant research has been conducted into developing alternative catalysts. Metallophthalocyanines (MPc) have garnered attention for use as catalysts. Iron phthalocyanine (FePc) has been shown to have catalytic activity towards the reduction of oxygen. Coupling of the catalyst to nanostructured carbon materials, such as multi-walled carbon nanotubes, has been observed to have several advantages as nanostructures have a high surface-to-volume ratio. In this study, we have attempted to assess the suitability of FePc, both its bulk and nanostructured form, as an oxygen reduction catalyst and acid functionalized multi-walled carbon nanotubes for use as a catalyst support using electrochemical techniques such as cyclic voltammetry and electrochemical impedance spectroscopy. We showed, for the first time, the catalytic nature of nanostructured FePc towards the ORR. Applying the data obtained from the electrochemical analyses, electrodes were modified using FePc and MWCNTs and applied to an Enterobacter cloacae-based MFC. Several operational parameters of the MFC, such as temperature and ionic strength, were optimized during the course of the study. We showed that optimized FePc:MWCNT-modified electrodes compared favourably to platinum-based electrodes in terms of power densities obtained in a microbial fuel cell.
- Full Text:
- Date Issued: 2011
- Authors: Edwards, Sean
- Date: 2011
- Subjects: Microbial fuel cells , Waste products as fuel , Nanostructured materials , Electrochemistry , Nanotubes
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4107 , http://hdl.handle.net/10962/d1011742 , Microbial fuel cells , Waste products as fuel , Nanostructured materials , Electrochemistry , Nanotubes
- Description: Microbial fuel cells (MFCs) are a promising form of alternative energy capable of harnessing the potential energy stores in organic waste. The oxygen reduction reaction (ORR) forms an integral role in the generation of electricity in MFCs however it is also a potential obstacle in enhancing the performance of MFCs. Platinum, a commonly used catalyst for the ORR, is expensive and rare. Significant research has been conducted into developing alternative catalysts. Metallophthalocyanines (MPc) have garnered attention for use as catalysts. Iron phthalocyanine (FePc) has been shown to have catalytic activity towards the reduction of oxygen. Coupling of the catalyst to nanostructured carbon materials, such as multi-walled carbon nanotubes, has been observed to have several advantages as nanostructures have a high surface-to-volume ratio. In this study, we have attempted to assess the suitability of FePc, both its bulk and nanostructured form, as an oxygen reduction catalyst and acid functionalized multi-walled carbon nanotubes for use as a catalyst support using electrochemical techniques such as cyclic voltammetry and electrochemical impedance spectroscopy. We showed, for the first time, the catalytic nature of nanostructured FePc towards the ORR. Applying the data obtained from the electrochemical analyses, electrodes were modified using FePc and MWCNTs and applied to an Enterobacter cloacae-based MFC. Several operational parameters of the MFC, such as temperature and ionic strength, were optimized during the course of the study. We showed that optimized FePc:MWCNT-modified electrodes compared favourably to platinum-based electrodes in terms of power densities obtained in a microbial fuel cell.
- Full Text:
- Date Issued: 2011
A psychobiography of Archbishop Emeritus Desmond Mpilo Tutu
- Authors: Eliastam, Liesl Marijke
- Date: 2011
- Subjects: Developmental psychology , Life cycle, Human -- Psychological aspects , Psychology -- Biographical methods , Personality -- Research -- Methodology , Emotional intelligence
- Language: English
- Type: Thesis , Masters , M Soc Sc (C Psy)
- Identifier: vital:11856 , http://hdl.handle.net/10353/537 , Developmental psychology , Life cycle, Human -- Psychological aspects , Psychology -- Biographical methods , Personality -- Research -- Methodology , Emotional intelligence
- Description: Psychobiographies offer the illuminating experience of uncovering the story of an individual’s life through the lens of a psychological theory. Psychobiographies offer the chance to gain a deeper understanding of what makes that individual unique. This study aimed to explore and describe the emotional intelligence of Archbishop Emeritus Desmond Tutu according to Goleman’s (1998) theory of Emotional Intelligence. Tutu was chosen as a subject for this study because of his extraordinary life and accomplishments, and because he is regarded as a prominent figure of moral leadership in South Africa. A qualitative psychobiographical research method was utilised. Data was collected from both primary and secondary sources to enhance internal validity, and was then analysed according to Miles and Huberman’s (1994) approach. The findings suggest that Tutu applied all of the twenty five emotional intelligence capacities during his life, and that at times, some were used more extensively than others. This study is groundbreaking in that it is the first psychobiography on Desmond Tutu, and it is the first psychobiography undertaken at the University of Fort Hare. Psychobiographies offer an opportunity to evaluate the psychological theory which is applied. It was found that Goleman’s (1998) theory of Emotional Intelligence is supported by this study.
- Full Text:
- Date Issued: 2011
- Authors: Eliastam, Liesl Marijke
- Date: 2011
- Subjects: Developmental psychology , Life cycle, Human -- Psychological aspects , Psychology -- Biographical methods , Personality -- Research -- Methodology , Emotional intelligence
- Language: English
- Type: Thesis , Masters , M Soc Sc (C Psy)
- Identifier: vital:11856 , http://hdl.handle.net/10353/537 , Developmental psychology , Life cycle, Human -- Psychological aspects , Psychology -- Biographical methods , Personality -- Research -- Methodology , Emotional intelligence
- Description: Psychobiographies offer the illuminating experience of uncovering the story of an individual’s life through the lens of a psychological theory. Psychobiographies offer the chance to gain a deeper understanding of what makes that individual unique. This study aimed to explore and describe the emotional intelligence of Archbishop Emeritus Desmond Tutu according to Goleman’s (1998) theory of Emotional Intelligence. Tutu was chosen as a subject for this study because of his extraordinary life and accomplishments, and because he is regarded as a prominent figure of moral leadership in South Africa. A qualitative psychobiographical research method was utilised. Data was collected from both primary and secondary sources to enhance internal validity, and was then analysed according to Miles and Huberman’s (1994) approach. The findings suggest that Tutu applied all of the twenty five emotional intelligence capacities during his life, and that at times, some were used more extensively than others. This study is groundbreaking in that it is the first psychobiography on Desmond Tutu, and it is the first psychobiography undertaken at the University of Fort Hare. Psychobiographies offer an opportunity to evaluate the psychological theory which is applied. It was found that Goleman’s (1998) theory of Emotional Intelligence is supported by this study.
- Full Text:
- Date Issued: 2011
A case study investigation into drama in education as an effective teaching methodology to support the goals of outcome based education
- Authors: Elliott, Terri Anne
- Date: 2011
- Subjects: Drama in education -- South Africa Competency based education -- South Africa Curriculum planning -- South Africa Student centered learning -- South Africa Critical thinking -- Study and teaching -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2160 , http://hdl.handle.net/10962/d1008306
- Description: The introduction of outcomes based education (OBE) in the form of Curriculum 2005 (C2005), the National Curriculum Statement (NCS) and the Revised National Curriculum Statement (RNCS) in post-apartheid South Africa resulted in a shift from a content-centred to a learner-centred view on education. This transition took place rapidly as the new government wanted to introduce a democratic education system after the divisive Bantu education system from Apartheid. However, after the changes were implemented, education in South Africa was theoretically outcomes based but practically many educators were still teaching in a content-centred manner. The research puts forward the proposal that drama-in-education (D-i-E) is a useful means by which to align the practical and theoretical goals of OBE within the context of South Africa's current RNCS. This hypothesis drives the main research question: "Can D-i-E be an effective teaching methodology to realise the goals of the RNCS and generate OBE learning environments in a South African high school?" D-i-E is a learner-centred teaching methodology and in practise it meets many of the goals and Critical Cross-Field Outcomes (CCFOs) of OBE. Some of these include the fact that learners can: • Practice problem-solving skills; • Engage with critical and creative thinking; • Grow cultural and aesthetic sensitivity; • Work effectively in groups; and ii. • Learn in inclusive environments that cater for different learning styles and levels. The research examines the use of D-i-E as an outcomes based methodology by which the RNCS could be implemented in the classroom. This is explored through the use of qualitative research in the form of a case study investigation at a South African high school. The case study was conducted with Grade 11 and Grade 12 Dramatic Arts learners and involves an analysis of a D-i-E approach to learning. The conclusion that D-i-E is an effective outcomes based teaching methodology which could assist educators in realising the RNCS was largely reached through participant observation of D-i-E classes and by analysing the learners' journals in which they reflected on D-i-E experiences. The learners' feedback about the experience was generally positive and they reflected that they found D-i-E beneficial because of the fact that it engaged them experientially. They also reflected that D-i-E provided them with a more meaningful and exciting way of learning. These findings are however only generalisable to the type of context (Dramatic Arts learners from a well-resourced girls' high school) in which the research was conducted. The findings provide detailed insight into a specific case study and may be beneficial to educators in South Africa who aim to make use of the same or similar methodologies in their classroom practice. D-i-E also supports many of the underlying tenants of OBE such as learner-centredness, learner diversity and inclusive learning, and can effectively aid educators in implementing the RNCS in an outcomes based way.
- Full Text:
- Date Issued: 2011
- Authors: Elliott, Terri Anne
- Date: 2011
- Subjects: Drama in education -- South Africa Competency based education -- South Africa Curriculum planning -- South Africa Student centered learning -- South Africa Critical thinking -- Study and teaching -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2160 , http://hdl.handle.net/10962/d1008306
- Description: The introduction of outcomes based education (OBE) in the form of Curriculum 2005 (C2005), the National Curriculum Statement (NCS) and the Revised National Curriculum Statement (RNCS) in post-apartheid South Africa resulted in a shift from a content-centred to a learner-centred view on education. This transition took place rapidly as the new government wanted to introduce a democratic education system after the divisive Bantu education system from Apartheid. However, after the changes were implemented, education in South Africa was theoretically outcomes based but practically many educators were still teaching in a content-centred manner. The research puts forward the proposal that drama-in-education (D-i-E) is a useful means by which to align the practical and theoretical goals of OBE within the context of South Africa's current RNCS. This hypothesis drives the main research question: "Can D-i-E be an effective teaching methodology to realise the goals of the RNCS and generate OBE learning environments in a South African high school?" D-i-E is a learner-centred teaching methodology and in practise it meets many of the goals and Critical Cross-Field Outcomes (CCFOs) of OBE. Some of these include the fact that learners can: • Practice problem-solving skills; • Engage with critical and creative thinking; • Grow cultural and aesthetic sensitivity; • Work effectively in groups; and ii. • Learn in inclusive environments that cater for different learning styles and levels. The research examines the use of D-i-E as an outcomes based methodology by which the RNCS could be implemented in the classroom. This is explored through the use of qualitative research in the form of a case study investigation at a South African high school. The case study was conducted with Grade 11 and Grade 12 Dramatic Arts learners and involves an analysis of a D-i-E approach to learning. The conclusion that D-i-E is an effective outcomes based teaching methodology which could assist educators in realising the RNCS was largely reached through participant observation of D-i-E classes and by analysing the learners' journals in which they reflected on D-i-E experiences. The learners' feedback about the experience was generally positive and they reflected that they found D-i-E beneficial because of the fact that it engaged them experientially. They also reflected that D-i-E provided them with a more meaningful and exciting way of learning. These findings are however only generalisable to the type of context (Dramatic Arts learners from a well-resourced girls' high school) in which the research was conducted. The findings provide detailed insight into a specific case study and may be beneficial to educators in South Africa who aim to make use of the same or similar methodologies in their classroom practice. D-i-E also supports many of the underlying tenants of OBE such as learner-centredness, learner diversity and inclusive learning, and can effectively aid educators in implementing the RNCS in an outcomes based way.
- Full Text:
- Date Issued: 2011
An evaluation of the feasibility of obtaining payment for ecosystem services for the Baviaanskloof Nature Reserve
- Authors: Erlank, Wayne Michael
- Date: 2011
- Subjects: Ecosystem services -- South Africa -- Eastern Cape Ecology -- Economic aspects -- South Africa -- Eastern Cape Environmental economics -- South Africa -- Eastern Cape Water-supply -- South Africa -- Eastern Cape Water-supply -- South Africa -- Eastern Cape -- Management Water resources development -- South Africa -- Eastern Cape Nature conservation -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:742 , http://hdl.handle.net/10962/d1003862
- Description: Cities must go further and further away to find new, more costly sources of water for human consumption while industries and agriculture continue to compete for increasingly scarce water resources. This may already be seen occurring within the Nelson Mandela Bay Metro where the severe drought being experienced during the past 18 months has severely depleted water supply dams. One of the main supply dams to the Nelson Mandela Bay Municipality is situated within the Baviaanskloof Nature Reserve and World Heritage Site. The potential of funding the Baviaanskloof Nature Reserve and World Heritage Site with payments for ecosystem services (water) obtained for water services supplied to the Nelson Mandela Bay Municipalities and agriculture in the Gamtoos River Valley will ensure financial sustainable for the Baviaanskloof Nature Reserve and World Heritage Site in the long term. This ability to become financially independent and generate its own income will place the Baviaanskloof Nature Reserve and World Heritage Site in a unique position within the conservation community in South Africa as only a very few protected areas are self sustaining through payment for an ecosystem service.
- Full Text:
- Date Issued: 2011
- Authors: Erlank, Wayne Michael
- Date: 2011
- Subjects: Ecosystem services -- South Africa -- Eastern Cape Ecology -- Economic aspects -- South Africa -- Eastern Cape Environmental economics -- South Africa -- Eastern Cape Water-supply -- South Africa -- Eastern Cape Water-supply -- South Africa -- Eastern Cape -- Management Water resources development -- South Africa -- Eastern Cape Nature conservation -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:742 , http://hdl.handle.net/10962/d1003862
- Description: Cities must go further and further away to find new, more costly sources of water for human consumption while industries and agriculture continue to compete for increasingly scarce water resources. This may already be seen occurring within the Nelson Mandela Bay Metro where the severe drought being experienced during the past 18 months has severely depleted water supply dams. One of the main supply dams to the Nelson Mandela Bay Municipality is situated within the Baviaanskloof Nature Reserve and World Heritage Site. The potential of funding the Baviaanskloof Nature Reserve and World Heritage Site with payments for ecosystem services (water) obtained for water services supplied to the Nelson Mandela Bay Municipalities and agriculture in the Gamtoos River Valley will ensure financial sustainable for the Baviaanskloof Nature Reserve and World Heritage Site in the long term. This ability to become financially independent and generate its own income will place the Baviaanskloof Nature Reserve and World Heritage Site in a unique position within the conservation community in South Africa as only a very few protected areas are self sustaining through payment for an ecosystem service.
- Full Text:
- Date Issued: 2011
South African money market volatility, asymmetry and retail interest pass-through
- Authors: Fadiran, Gideon Oluwatobi
- Date: 2011
- Subjects: Money market -- South Africa Interest rates -- South Africa Monetary policy -- South Africa Econometric models Banks and banking -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:993 , http://hdl.handle.net/10962/d1002728
- Description: The purpose of this paper is to examine the interest rate transmission mechanism for South Africa as an emerging economy in a pre-repo and repo system. It explains how the money market rate is transmitted to the retail interest rates both in the long-run and short-run and tests the symmetric and asymmetric interest rate pass-through using the Scholnick (1996) ECM and the Wang and Lee (2009) ECM-EGARCH (1, 1)-M methodology. This permitted the examination of the impact of interest rate volatility, along with the leverage effect. An incomplete pass-through is found in the short-run. From the entire sample period, a symmetric adjustment is found in the deposit rate, which had upward rigidity adjustment, while an asymmetric adjustment is found in the lending rate, with a downward rigidity adjustment. All the adjustments supported the collusive pricing arrangements. According to the conditional variance estimation of the ECM-EGARCH (1, 1), negative volatility impact and leverage effect are present and influential only in the deposit interest rate adjustment process in South Africa.
- Full Text:
- Date Issued: 2011
- Authors: Fadiran, Gideon Oluwatobi
- Date: 2011
- Subjects: Money market -- South Africa Interest rates -- South Africa Monetary policy -- South Africa Econometric models Banks and banking -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:993 , http://hdl.handle.net/10962/d1002728
- Description: The purpose of this paper is to examine the interest rate transmission mechanism for South Africa as an emerging economy in a pre-repo and repo system. It explains how the money market rate is transmitted to the retail interest rates both in the long-run and short-run and tests the symmetric and asymmetric interest rate pass-through using the Scholnick (1996) ECM and the Wang and Lee (2009) ECM-EGARCH (1, 1)-M methodology. This permitted the examination of the impact of interest rate volatility, along with the leverage effect. An incomplete pass-through is found in the short-run. From the entire sample period, a symmetric adjustment is found in the deposit rate, which had upward rigidity adjustment, while an asymmetric adjustment is found in the lending rate, with a downward rigidity adjustment. All the adjustments supported the collusive pricing arrangements. According to the conditional variance estimation of the ECM-EGARCH (1, 1), negative volatility impact and leverage effect are present and influential only in the deposit interest rate adjustment process in South Africa.
- Full Text:
- Date Issued: 2011
In vitro drug-herb interaction potential of African medicinal plant products used by Type II diabetics
- Authors: Fang, Yuan Yuan
- Date: 2011
- Subjects: Materia medica, Vegetable -- South Africa , Drugs -- Therapeutic use , Drug-herb interactions -- South Africa , Non-insulin-dependent diabetes -- South Africa , Non-insulin-dependent diabetes -- Treatment -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10317 , http://hdl.handle.net/10948/1341 , Materia medica, Vegetable -- South Africa , Drugs -- Therapeutic use , Drug-herb interactions -- South Africa , Non-insulin-dependent diabetes -- South Africa , Non-insulin-dependent diabetes -- Treatment -- South Africa
- Description: In Africa, use of medicinal plants for the treatment of diabetes is very common. However, efficacy on co-administering of medicinal plants with therapeutic drugs hasn't been fully determined, especially for African medicinal plants. The current study focused on assessing the in vitro modulation effects of three popular African medicinal plants, namely: Aloe ferox, Sutherlandia frutescens and Prunus africana (including five commercial preparations containing these medicinal plants) on two of the most important anti-diabetic drug metabolising enzymes, Cytochrome P450 (CYP450) 2C9 and CYP3A4 and a key drug efflux transporter, P-glycoprotein (P-gp). Vivid® microsome-based screening kits were used to assess inhibitory potency of plants preparations on CYP2C9 and CYP3A4 enzymes activities. The study showed that P. africana was a more potent inhibitor of CYP2C9 and CYP3A4 activity than the corresponding positive controls Ginkgo biloba and St. John's wort, which are known to cause clinically significant drug-herb interactions. S. frutescens leaf extract demonstrated potent to moderate inhibition on both the tested CYP activities, while its commercial products (Promune® and Probetix®) possessed moderate to mild inhibitory effects on the activities of both CYPs. Potent inhibitory effect on CYP2C9 and CYP3A4 was seen with Aloe Ferox®. Prosit® and Aloes powder® showed potent to moderate inhibition on CYP2C9 activity and moderate to mild inhibition on CYP3A4 activity. In addition to CYP450 activity, the present study also investigated the effects of the selected medicinal plant products on the activity of the main drug efflux protein, P-gp. A screening assay was specifically developed to assess the potential for herbal remedies to interact with P-gp mediated drug absorption. The assay is based on the principle of the reversal of drug resistance in modified Caco-2 cells specifically altered to express high iv efflux protein activity. These cells display a multidrug resistance phenotype and the addition of a plant extract containing a P-gp inhibitor or substrate will inhibit or compete with any cytotoxic drug and consequently reverse the drug resistance. The suitability of the assay was confirmed using a known P-gp inhibitor. The study observed that the anti-proliferation effect of vinblastine was significantly enhanced in vinblastine-resistant Caco-2 cells, which have high P-gp expression, when they were exposed to the selected African herbal preparations. This observation indicates that the studied plant preparations may alter P-gp functionality and therefore lead to interference with the absorption of co-administered drugs. The outcomes of this study provide useful information on whether there are any potential drug-herb interactions between the commonly used African medicinal plants and oral anti-diabetic drugs, at the level of CYP and P-gp drug metabolism and could contribute to better therapeutic management of Type II diabetics. However these predicted interactions will need to be verified in a clinical setting.
- Full Text:
- Date Issued: 2011
- Authors: Fang, Yuan Yuan
- Date: 2011
- Subjects: Materia medica, Vegetable -- South Africa , Drugs -- Therapeutic use , Drug-herb interactions -- South Africa , Non-insulin-dependent diabetes -- South Africa , Non-insulin-dependent diabetes -- Treatment -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10317 , http://hdl.handle.net/10948/1341 , Materia medica, Vegetable -- South Africa , Drugs -- Therapeutic use , Drug-herb interactions -- South Africa , Non-insulin-dependent diabetes -- South Africa , Non-insulin-dependent diabetes -- Treatment -- South Africa
- Description: In Africa, use of medicinal plants for the treatment of diabetes is very common. However, efficacy on co-administering of medicinal plants with therapeutic drugs hasn't been fully determined, especially for African medicinal plants. The current study focused on assessing the in vitro modulation effects of three popular African medicinal plants, namely: Aloe ferox, Sutherlandia frutescens and Prunus africana (including five commercial preparations containing these medicinal plants) on two of the most important anti-diabetic drug metabolising enzymes, Cytochrome P450 (CYP450) 2C9 and CYP3A4 and a key drug efflux transporter, P-glycoprotein (P-gp). Vivid® microsome-based screening kits were used to assess inhibitory potency of plants preparations on CYP2C9 and CYP3A4 enzymes activities. The study showed that P. africana was a more potent inhibitor of CYP2C9 and CYP3A4 activity than the corresponding positive controls Ginkgo biloba and St. John's wort, which are known to cause clinically significant drug-herb interactions. S. frutescens leaf extract demonstrated potent to moderate inhibition on both the tested CYP activities, while its commercial products (Promune® and Probetix®) possessed moderate to mild inhibitory effects on the activities of both CYPs. Potent inhibitory effect on CYP2C9 and CYP3A4 was seen with Aloe Ferox®. Prosit® and Aloes powder® showed potent to moderate inhibition on CYP2C9 activity and moderate to mild inhibition on CYP3A4 activity. In addition to CYP450 activity, the present study also investigated the effects of the selected medicinal plant products on the activity of the main drug efflux protein, P-gp. A screening assay was specifically developed to assess the potential for herbal remedies to interact with P-gp mediated drug absorption. The assay is based on the principle of the reversal of drug resistance in modified Caco-2 cells specifically altered to express high iv efflux protein activity. These cells display a multidrug resistance phenotype and the addition of a plant extract containing a P-gp inhibitor or substrate will inhibit or compete with any cytotoxic drug and consequently reverse the drug resistance. The suitability of the assay was confirmed using a known P-gp inhibitor. The study observed that the anti-proliferation effect of vinblastine was significantly enhanced in vinblastine-resistant Caco-2 cells, which have high P-gp expression, when they were exposed to the selected African herbal preparations. This observation indicates that the studied plant preparations may alter P-gp functionality and therefore lead to interference with the absorption of co-administered drugs. The outcomes of this study provide useful information on whether there are any potential drug-herb interactions between the commonly used African medicinal plants and oral anti-diabetic drugs, at the level of CYP and P-gp drug metabolism and could contribute to better therapeutic management of Type II diabetics. However these predicted interactions will need to be verified in a clinical setting.
- Full Text:
- Date Issued: 2011
Development, manufacture and assessment of Clobetasol 17-propionate cream formulations
- Fauzee, Ayeshah Fateemah Beebee
- Authors: Fauzee, Ayeshah Fateemah Beebee
- Date: 2011
- Subjects: Adrenocortical hormones , Adrenocortical hormones -- Physiological effect , Adrenocortical hormones -- Testing , Drugs -- Testing , Drugs -- Development , Dermatopharmacology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3856 , http://hdl.handle.net/10962/d1013324
- Description: Eczema or dermatitis is the most common dermatological condition accounting for one-third of all diagnoses in the total population surveyed in South Africa. The prevalence of seborrhoeic dermatitis, extreme photodermatitis and severe psoriasis has increased markedly over the last decade and this increase may be ascribed to the HIV epidemic, first diagnosed in South Africa in 1982. Potent innovator corticosteroids, such as clobetasol 17-propionate (CP) that are used to treat skin disorders, are expensive and there is therefore a need for the production of generic topical corticosteroid products. Formulation and manufacturing processes can be challenging aspects for formulation scientists to produce a robust product that will elicit an appropriate and desirable pharmacokinetic-pharmacodynamic profile. Laboratory scale CP creams were manufactured using different concentrations of Gelot® 64 and propylene glycol in order to establish a composition that would produce a formulation, with similar physical and chemical characteristics and in vitro release profile as an innovator product, Dermovate®. These formulations were assessed in terms of their viscosity, spreadability, pH, content uniformity and in vitro release characteristics using a Franz diffusion cell apparatus. A formulation containing 3% w/w Gelot® 64 and 46% v/v propylene glycol (CPLS-02) was found to exhibit similar viscosity and spreadability characteristics and released CP in a manner similar to Dermovate®. The mechanism of drug release was evaluated using mathematical models such as zero order, first order and Higuchi models. In addition, the in vitro release profiles were characterised by use of difference (f1) and similarity (f2 and Sd) factors. A scale-up formulation with the same % w/w composition as the laboratory scale was also investigated following manufacture using a Wintech® cream/ointment mixer. A Central Composite Design approach was used to investigate the effect of process variables on the performance of the scale-up cream formulations. The homogenisation speed, anchor speed, homogenisation time and cooling time were the process variables investigated. Thirty scale-up batches were manufactured and analysed in terms of their viscosity, spreadability, pH, % drug content and cumulative % drug released per unit area over 72 hours. Model fitting using Design-Expert® software was undertaken and revealed that a correlation between the process variables and the cream responses was most suitably described by quadratic polynomial relationships. The homogenisation speed had the most significant effect on the quality of the scale-up formulations, whereas the anchor speed had a secondary effect on the measured responses, for the formulations investigated. The qualitative interpretation and statistical analysis of the in vitro release data from the scale-up formulations using ANOVA and the f1, f2 and Sd factors revealed that one scale-up batch (CPSU-04), for which the process variables were a homogenisation speed of 1900 rpm, an anchor speed of 35 rpm, a homogenisation time of 100 minutes and a cooling time of 100 minutes, released CP at a similar rate and extent to Dermovate®. A diffusion-controlled mechanism appeared to be predominant in these formulations. A human skin blanching study, using both visual and chromameter assessments, was performed to establish whether batch CPSU-04 was bioequivalent to Dermovate®. The bioequivalence of the selected scale-up formulation to Dermovate® was confirmed, following the calculation of a 90% CI.
- Full Text:
- Date Issued: 2011
- Authors: Fauzee, Ayeshah Fateemah Beebee
- Date: 2011
- Subjects: Adrenocortical hormones , Adrenocortical hormones -- Physiological effect , Adrenocortical hormones -- Testing , Drugs -- Testing , Drugs -- Development , Dermatopharmacology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3856 , http://hdl.handle.net/10962/d1013324
- Description: Eczema or dermatitis is the most common dermatological condition accounting for one-third of all diagnoses in the total population surveyed in South Africa. The prevalence of seborrhoeic dermatitis, extreme photodermatitis and severe psoriasis has increased markedly over the last decade and this increase may be ascribed to the HIV epidemic, first diagnosed in South Africa in 1982. Potent innovator corticosteroids, such as clobetasol 17-propionate (CP) that are used to treat skin disorders, are expensive and there is therefore a need for the production of generic topical corticosteroid products. Formulation and manufacturing processes can be challenging aspects for formulation scientists to produce a robust product that will elicit an appropriate and desirable pharmacokinetic-pharmacodynamic profile. Laboratory scale CP creams were manufactured using different concentrations of Gelot® 64 and propylene glycol in order to establish a composition that would produce a formulation, with similar physical and chemical characteristics and in vitro release profile as an innovator product, Dermovate®. These formulations were assessed in terms of their viscosity, spreadability, pH, content uniformity and in vitro release characteristics using a Franz diffusion cell apparatus. A formulation containing 3% w/w Gelot® 64 and 46% v/v propylene glycol (CPLS-02) was found to exhibit similar viscosity and spreadability characteristics and released CP in a manner similar to Dermovate®. The mechanism of drug release was evaluated using mathematical models such as zero order, first order and Higuchi models. In addition, the in vitro release profiles were characterised by use of difference (f1) and similarity (f2 and Sd) factors. A scale-up formulation with the same % w/w composition as the laboratory scale was also investigated following manufacture using a Wintech® cream/ointment mixer. A Central Composite Design approach was used to investigate the effect of process variables on the performance of the scale-up cream formulations. The homogenisation speed, anchor speed, homogenisation time and cooling time were the process variables investigated. Thirty scale-up batches were manufactured and analysed in terms of their viscosity, spreadability, pH, % drug content and cumulative % drug released per unit area over 72 hours. Model fitting using Design-Expert® software was undertaken and revealed that a correlation between the process variables and the cream responses was most suitably described by quadratic polynomial relationships. The homogenisation speed had the most significant effect on the quality of the scale-up formulations, whereas the anchor speed had a secondary effect on the measured responses, for the formulations investigated. The qualitative interpretation and statistical analysis of the in vitro release data from the scale-up formulations using ANOVA and the f1, f2 and Sd factors revealed that one scale-up batch (CPSU-04), for which the process variables were a homogenisation speed of 1900 rpm, an anchor speed of 35 rpm, a homogenisation time of 100 minutes and a cooling time of 100 minutes, released CP at a similar rate and extent to Dermovate®. A diffusion-controlled mechanism appeared to be predominant in these formulations. A human skin blanching study, using both visual and chromameter assessments, was performed to establish whether batch CPSU-04 was bioequivalent to Dermovate®. The bioequivalence of the selected scale-up formulation to Dermovate® was confirmed, following the calculation of a 90% CI.
- Full Text:
- Date Issued: 2011
The genetic diversity and conservation biology of the rare terrestrial snail genus Prestonella
- Authors: Fearon, Janine Lee
- Date: 2011
- Subjects: Snails -- South Africa , Snails -- Conservation -- South Africa , Snails -- Variation -- South Africa , Biodiversity -- South Africa , Snails -- Genetics -- South Africa , Snails -- Habitat -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4191 , http://hdl.handle.net/10962/d1003760 , Snails -- South Africa , Snails -- Conservation -- South Africa , Snails -- Variation -- South Africa , Biodiversity -- South Africa , Snails -- Genetics -- South Africa , Snails -- Habitat -- South Africa
- Description: Prestonella bowkeri and Prestonella nuptialis are montane specialists endemic to the southern Great Escarpment of South Africa. Phylogeographic analyses of these species based on mitochondrial markers CO1 and 16S reveal extremely high levels of divergence between populations indicating a lack of gene flow between populations. This is not surprising, because P. nuptialis and P. bowkeri have limited dispersal capacity, low vagility, a highly fragmented distribution and are habitat specialists that are restricted to isolated mesic refugia associated with waterfalls and montane seepages. A relaxed Bayesian clock estimate suggests that populations diverged from one another during the mid-late Miocene (12.5-7 MYA) which coincides with the modern trends of seasonal aridity which began during the Miocene. This result should be viewed with caution because the rates used are at best imprecise estimates of mutation rates in snails. There is no clear dichotomy between the two species and P. bowkeri is paraphyletic with respect to P. nuptialis, as a consequence the taxonomy is unclear. Due to the high levels of sequence divergence between populations they may be considered as evolutionary significant units (ESU’s). An assessment of haplotype diversity (h) and nucleotide diversity (π) reveals that populations in the western part of the Great Escarpment are more genetically depauperate than populations in the east. Correlations between genetic diversity and climatic variables show that genetically depauperate populations are found in areas that have lower annual rainfall, less reliable rainfall and higher potential evaporation, all factors associated with a drier, less mesic environment that increases the chances of a population bottleneck. This indicates that a shift towards a more arid environment may be a driver of genetic erosion. Historical climate change may thus have affected the amount and distribution of genetic diversity across the Great Escarpment since the Miocene. This has serious future implications for the survival of Prestonella. With predicted increase in global temperatures, climate change in South Africa is likely to result in range contraction and an eastward range shift for many species in the drier central and western areas (Erasmus et al. 2002) and regions along the Great Escarpment are likely to become more arid. Prestonella populations found living on inselbergs along the Great Escarpment are already restricted to site specific watercourses and seepages. An increase in the periods between stream flow, and increasing rainfall variability and mean annual potential evaporation are likely to have an adverse affect on species living in these habitats, resulting in further bottlenecks and possibly local extinction. An IUCN assessment of P. nuptialis and P. bowkeri suggests that these two species are probably endangered. The issue surrounding the conservation of Prestonella species is that they are threatened by global climate change, which cannot be simply restricted or prevented, which makes dealing with the threat of climate change difficult. Assisted migration (MA) may be considered as a method to prevent possible future extinctions of Prestonella populations, but will only be considered as a last resort. The thermal tolerance (Arrhenius breaking temperature and flat-line temperature) of individual snails from three Prestonella populations (one forest population and two thicket populations) were assessed using infrared sensors that detected changes in heart rate with increasing temperature. The forest population had a significantly lower Arrhenius breaking temperature (ABT) and flat-line temperature (FLT) than the two thicket population (p<0.05). Our results do not show a correlation between upper thermal limits and maximum habitat temperatures or other climatic variables in Prestonella populations. Although no correlation is found between ABT and maximum habitat temperature, it is likely that the differences seen between these populations are due to local micro-climate adaptation. The climatic variables used in this experiment are coarse estimates from GIS data and do not reflect actual microhabitat conditions. Forest environments are less heat stressed than thicket environments due to the forest canopy which may explain the lower ABT and FLT of the forest population.
- Full Text:
- Date Issued: 2011
- Authors: Fearon, Janine Lee
- Date: 2011
- Subjects: Snails -- South Africa , Snails -- Conservation -- South Africa , Snails -- Variation -- South Africa , Biodiversity -- South Africa , Snails -- Genetics -- South Africa , Snails -- Habitat -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4191 , http://hdl.handle.net/10962/d1003760 , Snails -- South Africa , Snails -- Conservation -- South Africa , Snails -- Variation -- South Africa , Biodiversity -- South Africa , Snails -- Genetics -- South Africa , Snails -- Habitat -- South Africa
- Description: Prestonella bowkeri and Prestonella nuptialis are montane specialists endemic to the southern Great Escarpment of South Africa. Phylogeographic analyses of these species based on mitochondrial markers CO1 and 16S reveal extremely high levels of divergence between populations indicating a lack of gene flow between populations. This is not surprising, because P. nuptialis and P. bowkeri have limited dispersal capacity, low vagility, a highly fragmented distribution and are habitat specialists that are restricted to isolated mesic refugia associated with waterfalls and montane seepages. A relaxed Bayesian clock estimate suggests that populations diverged from one another during the mid-late Miocene (12.5-7 MYA) which coincides with the modern trends of seasonal aridity which began during the Miocene. This result should be viewed with caution because the rates used are at best imprecise estimates of mutation rates in snails. There is no clear dichotomy between the two species and P. bowkeri is paraphyletic with respect to P. nuptialis, as a consequence the taxonomy is unclear. Due to the high levels of sequence divergence between populations they may be considered as evolutionary significant units (ESU’s). An assessment of haplotype diversity (h) and nucleotide diversity (π) reveals that populations in the western part of the Great Escarpment are more genetically depauperate than populations in the east. Correlations between genetic diversity and climatic variables show that genetically depauperate populations are found in areas that have lower annual rainfall, less reliable rainfall and higher potential evaporation, all factors associated with a drier, less mesic environment that increases the chances of a population bottleneck. This indicates that a shift towards a more arid environment may be a driver of genetic erosion. Historical climate change may thus have affected the amount and distribution of genetic diversity across the Great Escarpment since the Miocene. This has serious future implications for the survival of Prestonella. With predicted increase in global temperatures, climate change in South Africa is likely to result in range contraction and an eastward range shift for many species in the drier central and western areas (Erasmus et al. 2002) and regions along the Great Escarpment are likely to become more arid. Prestonella populations found living on inselbergs along the Great Escarpment are already restricted to site specific watercourses and seepages. An increase in the periods between stream flow, and increasing rainfall variability and mean annual potential evaporation are likely to have an adverse affect on species living in these habitats, resulting in further bottlenecks and possibly local extinction. An IUCN assessment of P. nuptialis and P. bowkeri suggests that these two species are probably endangered. The issue surrounding the conservation of Prestonella species is that they are threatened by global climate change, which cannot be simply restricted or prevented, which makes dealing with the threat of climate change difficult. Assisted migration (MA) may be considered as a method to prevent possible future extinctions of Prestonella populations, but will only be considered as a last resort. The thermal tolerance (Arrhenius breaking temperature and flat-line temperature) of individual snails from three Prestonella populations (one forest population and two thicket populations) were assessed using infrared sensors that detected changes in heart rate with increasing temperature. The forest population had a significantly lower Arrhenius breaking temperature (ABT) and flat-line temperature (FLT) than the two thicket population (p<0.05). Our results do not show a correlation between upper thermal limits and maximum habitat temperatures or other climatic variables in Prestonella populations. Although no correlation is found between ABT and maximum habitat temperature, it is likely that the differences seen between these populations are due to local micro-climate adaptation. The climatic variables used in this experiment are coarse estimates from GIS data and do not reflect actual microhabitat conditions. Forest environments are less heat stressed than thicket environments due to the forest canopy which may explain the lower ABT and FLT of the forest population.
- Full Text:
- Date Issued: 2011
Population assessments of priority plant species used by local communities in and around three Wild Coast reserves, Eastern Cape, South Africa
- Authors: Fearon, Joclyn Joe
- Date: 2011
- Subjects: Plant diversity conservation -- South Africa -- Eastern Cape , Rare plants -- South Africa -- Eastern Cape -- Population viability analysis , Biodiversity -- South Africa -- Eastern Cape , Plant conservation -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape , Human-plant relationships -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4751 , http://hdl.handle.net/10962/d1007059 , Plant diversity conservation -- South Africa -- Eastern Cape , Rare plants -- South Africa -- Eastern Cape -- Population viability analysis , Biodiversity -- South Africa -- Eastern Cape , Plant conservation -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape , Human-plant relationships -- South Africa -- Eastern Cape
- Description: The project was initiated by Eastern Cape Parks (ECP) as a request for the construction of inventories of priority species and their population levels inside three nature reserves on the Eastern Cape Wild Coast, South Africa, and to develop a strategic management plan to manage these natural resources in each reserve. Thirty key species were identified by local communities in and around Dwesa-Cwebe, Silaka and Mkambati Nature Reserves through community workshops. For forested areas belt transects of 100 m x 6 m where used. The basal circumference of key tree species within the belt transect was measured as well as the height of saplings (height < 150 m). Tree species were categorized based on densities, size class distribution (SCD) curves and values, and spatial grain. For grassland areas straight transects of 200 m long were used, along which ten 3 m x 3 m quadrates were placed at 20 m intervals. Within each grassland transect the height of herbs or tuft diameter of grasses was recorded and percentage cover estimated. Grassland species were categorized based on density, SCD curves and percentage cover. All species were placed into harvesting categories based on analysed ecological data that was collected in the field. Category 1 species were very rare or not found in the reserve and it was recommended that species be conserved and monitored. Category 2 species had low densities in the reserve indicating declining populations and was suggested that these be monitored and not harvested. Category 3 species had high densities and have potential for harvesting with strict limitations. Category 4 species were most abundant with very high densities and can be harvested within management guidelines. These categories were grouped further using social and ecological data such as harvesting risk, frequency of collection, use value and number of uses. This highlighted which species have conservation priority within each category and a decision can be made as to how intense or limited extraction should be. By incorporating GIS the distribution of each species was looked at and harvesting and non-harvesting zones established to determine where species can be extracted. Monitoring plans must consider the quantity of plant material collected, fire regimes, optimal harvesting rates and harvesting zones, and be able to pick up changes in populations. Also, it is important that the community be involved in conserving and monitoring these species. Adaptive monitoring and management must be used to steer harvesting practices in the Wild Coast reserves. This allows for the development of harvesting practices through ‘learning by doing’, and the evolution of good questions to guide monitoring decisions
- Full Text:
- Date Issued: 2011
- Authors: Fearon, Joclyn Joe
- Date: 2011
- Subjects: Plant diversity conservation -- South Africa -- Eastern Cape , Rare plants -- South Africa -- Eastern Cape -- Population viability analysis , Biodiversity -- South Africa -- Eastern Cape , Plant conservation -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape , Human-plant relationships -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4751 , http://hdl.handle.net/10962/d1007059 , Plant diversity conservation -- South Africa -- Eastern Cape , Rare plants -- South Africa -- Eastern Cape -- Population viability analysis , Biodiversity -- South Africa -- Eastern Cape , Plant conservation -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape , Human-plant relationships -- South Africa -- Eastern Cape
- Description: The project was initiated by Eastern Cape Parks (ECP) as a request for the construction of inventories of priority species and their population levels inside three nature reserves on the Eastern Cape Wild Coast, South Africa, and to develop a strategic management plan to manage these natural resources in each reserve. Thirty key species were identified by local communities in and around Dwesa-Cwebe, Silaka and Mkambati Nature Reserves through community workshops. For forested areas belt transects of 100 m x 6 m where used. The basal circumference of key tree species within the belt transect was measured as well as the height of saplings (height < 150 m). Tree species were categorized based on densities, size class distribution (SCD) curves and values, and spatial grain. For grassland areas straight transects of 200 m long were used, along which ten 3 m x 3 m quadrates were placed at 20 m intervals. Within each grassland transect the height of herbs or tuft diameter of grasses was recorded and percentage cover estimated. Grassland species were categorized based on density, SCD curves and percentage cover. All species were placed into harvesting categories based on analysed ecological data that was collected in the field. Category 1 species were very rare or not found in the reserve and it was recommended that species be conserved and monitored. Category 2 species had low densities in the reserve indicating declining populations and was suggested that these be monitored and not harvested. Category 3 species had high densities and have potential for harvesting with strict limitations. Category 4 species were most abundant with very high densities and can be harvested within management guidelines. These categories were grouped further using social and ecological data such as harvesting risk, frequency of collection, use value and number of uses. This highlighted which species have conservation priority within each category and a decision can be made as to how intense or limited extraction should be. By incorporating GIS the distribution of each species was looked at and harvesting and non-harvesting zones established to determine where species can be extracted. Monitoring plans must consider the quantity of plant material collected, fire regimes, optimal harvesting rates and harvesting zones, and be able to pick up changes in populations. Also, it is important that the community be involved in conserving and monitoring these species. Adaptive monitoring and management must be used to steer harvesting practices in the Wild Coast reserves. This allows for the development of harvesting practices through ‘learning by doing’, and the evolution of good questions to guide monitoring decisions
- Full Text:
- Date Issued: 2011
Customer relationship management practiced by KOSAB
- Authors: Felix, Amoah
- Date: 2011
- Subjects: Customer relations , Customer services , Consumer satisfaction , Customer loyalty
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:8635 , http://hdl.handle.net/10948/d1008046 , Customer relations , Customer services , Consumer satisfaction , Customer loyalty
- Description: Customer relationship management (CRM) presents a new paradigm shift to the old traditional marketing strategies that are known and practiced by many organisations in South Africa and across the globe. Competition is not an excuse for failure anymore. Organisations that do not have any concrete strategies in dealing with the customer will not survive in the market. The ultimate goal of CRM is to enable organisations to forge closer ties with the customer so that a solid bond can be created to enhance loyalty and satisfaction. The goal for this research was to identify the CRM strategies used by a single organisation and thereafter suggest improvements to enhance customer loyalty. The results of the study could assist the management of the organisation to improve the CRM strategies which will hopefully enhance retention and prevent customer attrition. A literature review was conducted to unveil various elements of CRM, and strategies that can attract and retain customers. It helped in identifying themes for the empirical study. An in-depth interview was conducted with the general manager of the organisation to gauge his perception, and CRM practices in the organisation. An interview guide was used during the interview process. Four main topics namely: implementation of CRM, customer loyalty, customer complaints and conflict, and employees training and motivation were utilised for the interview guide and followed by further probing. Based on the responses obtained, analyses were made by comparing the responses to what literature revealed so that shortcomings could easily be identified.The study revealed that there were several inconsistencies with what was practised by the organisation and what the literature study revealed. Bearing in mind the shortcomings identified in the empirical study, the researcher made the following recommendations. The CRM implementation approach needs to be carefully planned with a clear defined vision and mission statement that focus on customer centredness. The organisation needs to invest in modern and innovative channels of communication and strategic partnership to reach the right customer. The organisation has to develop effective market segmentation and targeting to know the customer well. Consistent and highly relevant customer experiences should be drawn-on to fulfill the organisation’s promise of trust and reliability. The organisation should adopt competitive pricing strategy to limit customer sensitivity on price. The organisation should invest in employees’ development and welfare. Further research can be conducted to investigate the perception of other food retailers on the CRM strategies practiced. Further research can also be conducted in the organisation to investigate the perception of employees and customers on the CRM strategies practised.
- Full Text:
- Date Issued: 2011
- Authors: Felix, Amoah
- Date: 2011
- Subjects: Customer relations , Customer services , Consumer satisfaction , Customer loyalty
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:8635 , http://hdl.handle.net/10948/d1008046 , Customer relations , Customer services , Consumer satisfaction , Customer loyalty
- Description: Customer relationship management (CRM) presents a new paradigm shift to the old traditional marketing strategies that are known and practiced by many organisations in South Africa and across the globe. Competition is not an excuse for failure anymore. Organisations that do not have any concrete strategies in dealing with the customer will not survive in the market. The ultimate goal of CRM is to enable organisations to forge closer ties with the customer so that a solid bond can be created to enhance loyalty and satisfaction. The goal for this research was to identify the CRM strategies used by a single organisation and thereafter suggest improvements to enhance customer loyalty. The results of the study could assist the management of the organisation to improve the CRM strategies which will hopefully enhance retention and prevent customer attrition. A literature review was conducted to unveil various elements of CRM, and strategies that can attract and retain customers. It helped in identifying themes for the empirical study. An in-depth interview was conducted with the general manager of the organisation to gauge his perception, and CRM practices in the organisation. An interview guide was used during the interview process. Four main topics namely: implementation of CRM, customer loyalty, customer complaints and conflict, and employees training and motivation were utilised for the interview guide and followed by further probing. Based on the responses obtained, analyses were made by comparing the responses to what literature revealed so that shortcomings could easily be identified.The study revealed that there were several inconsistencies with what was practised by the organisation and what the literature study revealed. Bearing in mind the shortcomings identified in the empirical study, the researcher made the following recommendations. The CRM implementation approach needs to be carefully planned with a clear defined vision and mission statement that focus on customer centredness. The organisation needs to invest in modern and innovative channels of communication and strategic partnership to reach the right customer. The organisation has to develop effective market segmentation and targeting to know the customer well. Consistent and highly relevant customer experiences should be drawn-on to fulfill the organisation’s promise of trust and reliability. The organisation should adopt competitive pricing strategy to limit customer sensitivity on price. The organisation should invest in employees’ development and welfare. Further research can be conducted to investigate the perception of other food retailers on the CRM strategies practiced. Further research can also be conducted in the organisation to investigate the perception of employees and customers on the CRM strategies practised.
- Full Text:
- Date Issued: 2011
The demography and population dynamics of a re-introduced black rhinoceros population on the Great Fish River Reserve, Eastern Cape Province
- Authors: Fike, Bradley Robin
- Date: 2011
- Subjects: Black rhinoceros -- South Africa -- Great Fish River Valley , Population biology -- South Africa -- Great Fish River Valley , Black rhinoceros -- Habitat -- South Africa -- Great Fish River Valley , Black rhinoceros -- Adaptation -- South Africa -- Great Fish River Valley , Black rhinoceros -- Ecology -- South Africa -- Great Fish River Valley
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5948 , http://hdl.handle.net/10962/d1020869
- Description: The re-introduction of black rhinoceros onto the Great Fish River Reserve in the Eastern Cape, following the species absence for over a century, created an opportunity to study this species in the thicket biome, and in particular the succulent thicket of the Great Fish River valley. The thicket biome is quite different from the habitats in which other extant populations of these animals are found and where studies of their demography have been undertaken. Data collection occurred from May 1986, with the arrival of the first four animals to December 2008, when the population was estimated to be 144 individuals. A variety of monitoring techniques were used including direct ground observations, aerial helicopter census, aerial monitoring by microlight aircraft, camera traps and opportunistic observations, each with its own advantages and disadvantages. The combination of methods and effort has resulted in the population being recognized as completely known with up to 97% of the animals being located at least once per year with a mean frequency of sightings of 11.5 per animal per year. In 2008, the population was about 20% juvenile, 36% sub-adult and 44% adult with a female biased sex ratio of 1.3 females per male. Mean age at first birth was about 80 months and this increased significantly with increasing density of black rhinoceroses. Mean intercalf interval was about 28 months and 41% of adult females gave birth each year. Mortality rates were low for juveniles, higher for sub-adults and higher for males than females. There was a weak but significant positive effect of density on male mortality. Population growth rate was about 10% and was not significantly affected by density. These results suggest that this population is beginning to show the first indications of density dependant constraints and that harvesting should be implemented in order to maintain the productive tempo. A secondary goal of the Management Plan will then be realized as the population functions as a donor to establish founder populations elsewhere within the Diceros bicornis minor range.
- Full Text:
- Date Issued: 2011
- Authors: Fike, Bradley Robin
- Date: 2011
- Subjects: Black rhinoceros -- South Africa -- Great Fish River Valley , Population biology -- South Africa -- Great Fish River Valley , Black rhinoceros -- Habitat -- South Africa -- Great Fish River Valley , Black rhinoceros -- Adaptation -- South Africa -- Great Fish River Valley , Black rhinoceros -- Ecology -- South Africa -- Great Fish River Valley
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5948 , http://hdl.handle.net/10962/d1020869
- Description: The re-introduction of black rhinoceros onto the Great Fish River Reserve in the Eastern Cape, following the species absence for over a century, created an opportunity to study this species in the thicket biome, and in particular the succulent thicket of the Great Fish River valley. The thicket biome is quite different from the habitats in which other extant populations of these animals are found and where studies of their demography have been undertaken. Data collection occurred from May 1986, with the arrival of the first four animals to December 2008, when the population was estimated to be 144 individuals. A variety of monitoring techniques were used including direct ground observations, aerial helicopter census, aerial monitoring by microlight aircraft, camera traps and opportunistic observations, each with its own advantages and disadvantages. The combination of methods and effort has resulted in the population being recognized as completely known with up to 97% of the animals being located at least once per year with a mean frequency of sightings of 11.5 per animal per year. In 2008, the population was about 20% juvenile, 36% sub-adult and 44% adult with a female biased sex ratio of 1.3 females per male. Mean age at first birth was about 80 months and this increased significantly with increasing density of black rhinoceroses. Mean intercalf interval was about 28 months and 41% of adult females gave birth each year. Mortality rates were low for juveniles, higher for sub-adults and higher for males than females. There was a weak but significant positive effect of density on male mortality. Population growth rate was about 10% and was not significantly affected by density. These results suggest that this population is beginning to show the first indications of density dependant constraints and that harvesting should be implemented in order to maintain the productive tempo. A secondary goal of the Management Plan will then be realized as the population functions as a donor to establish founder populations elsewhere within the Diceros bicornis minor range.
- Full Text:
- Date Issued: 2011
Modelling trends in evapotranspiration using the MODIS LAI for selected Eastern Cape catchments
- Authors: Finca, Andiswa
- Date: 2011
- Subjects: Evapotranspiration , Evapotranspiration -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10651 , http://hdl.handle.net/10948/d1009517 , Evapotranspiration , Evapotranspiration -- South Africa -- Eastern Cape
- Description: Grassland is the dominant vegetation cover of many of the 19 Water Catchment Areas within South Africa. The inappropriate management of some of these grassland catchments by the communities that depend on them for their livelihoods, often results in overgrazed lands with low biomass or invasive alien species. The short grass maintained by grazing policies of many communities results in high storm flows that have an adverse effect on the quantity and quality of runoff and recharge. Catchment-scale water balances depend on accurate estimates of run-off, recharge and evapotranspiration (ET). This study focuses on the ET component of the catchment scale water balance and explores the effect of two different grazing strategies on ET. To achieve this, two contrasting but adjacent quaternary catchments namely: P10A (a high biomass site) and Q91C (a low biomass site) were selected within the Bushman’s River Primary catchment as primary study sites. Within each catchment, a relatively homogenous pixel of 1 km was selected, representing contrasting example of high and low intensity grazing. From an eleven year MODIS leaf area index (LAI) data stack (March 2000 – 2010), 8-day LAI values was extracted for each pixel in each catchment. Using the Penman- Monteith equation, potential evapotranspiration (ET0) was calculated using data from a nearly automatic weather station. Actual evapotranspiration was estimated by adjusting ET0 using the values extracted from the MODIS LAI product. The MODIS LAI ET (ETMODIS) obtained for the eleven year period for both 1 km pixels decreased consistently, reflecting a general trend in declining LAI throughout the Eastern Cape. The highest ETMODIS obtained from P10A was 610.3 mm (2001) and the lowest was 333.1 mm (2009). Then from Q91C the highest ET obtained was 534.7 mm (2006) and the lowest was 266.2 mm (2009). The ETMODIS results were validated for each catchment using the Open Top Chamber (OTC) which sums the water lost from vegetation and soil within the chamber. This validation was conducted during the growing season of 2010–11. Wind speed; relative humidity and temperature were measured both at the inlet and the outlet of the chamber on five clear sunny days for each 1 km pixel. ETa for the same period was compared to the OTC ET (ETOTC) using the regression analysis and a good relationship was observed with the r2 of 0.7065. The relationship observed confirmed that ETOTC closely approximates ETMODIS and that the OTC can be used as a tool to validate MODIS LAI ET on clear, low winds and sunny days. In order to demonstrate proof-of-concept for the use of this modeling of ETMODIS within a Payment for Ecosystem Services framework, the approach was applied to two other quaternary catchments under communal tenure. Within each catchment, three land use scenarios were created for each catchment to reflect potential changes in the standing aboveground biomass. For Scenario 1, the status quo was maintained; for Scenario 2, MODIS pixels representing 28 km in each catchment were selected and the LAI of these pixels was doubled; and for scenario 3, LAI was halved. ETMODIS was calculated for each scenario by adjusting the ET0 data from a nearby automatic weather station with the MODIS LAI product. The results showed that the estimated annual ETMODIS obtained from the high biomass catchment was 111 mm greater than that obtained from the low biomass catchment. When comparing between the scenarios, the annual ETMODIS obtained from scenario 2 was the highest of the 3 scenarios for both sites. These results confirm that increased leaf area results in higher annual ETMODIS. This has a positive long term impact on stream flow, as high grass biomass allows the rainfall to infiltrate the soil and be gradually released to the dams with reduced magnitude of storm flows. This approach has the potential to quantify the benefits to down-stream water users of improving above-ground biomass in catchments.
- Full Text:
- Date Issued: 2011
- Authors: Finca, Andiswa
- Date: 2011
- Subjects: Evapotranspiration , Evapotranspiration -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10651 , http://hdl.handle.net/10948/d1009517 , Evapotranspiration , Evapotranspiration -- South Africa -- Eastern Cape
- Description: Grassland is the dominant vegetation cover of many of the 19 Water Catchment Areas within South Africa. The inappropriate management of some of these grassland catchments by the communities that depend on them for their livelihoods, often results in overgrazed lands with low biomass or invasive alien species. The short grass maintained by grazing policies of many communities results in high storm flows that have an adverse effect on the quantity and quality of runoff and recharge. Catchment-scale water balances depend on accurate estimates of run-off, recharge and evapotranspiration (ET). This study focuses on the ET component of the catchment scale water balance and explores the effect of two different grazing strategies on ET. To achieve this, two contrasting but adjacent quaternary catchments namely: P10A (a high biomass site) and Q91C (a low biomass site) were selected within the Bushman’s River Primary catchment as primary study sites. Within each catchment, a relatively homogenous pixel of 1 km was selected, representing contrasting example of high and low intensity grazing. From an eleven year MODIS leaf area index (LAI) data stack (March 2000 – 2010), 8-day LAI values was extracted for each pixel in each catchment. Using the Penman- Monteith equation, potential evapotranspiration (ET0) was calculated using data from a nearly automatic weather station. Actual evapotranspiration was estimated by adjusting ET0 using the values extracted from the MODIS LAI product. The MODIS LAI ET (ETMODIS) obtained for the eleven year period for both 1 km pixels decreased consistently, reflecting a general trend in declining LAI throughout the Eastern Cape. The highest ETMODIS obtained from P10A was 610.3 mm (2001) and the lowest was 333.1 mm (2009). Then from Q91C the highest ET obtained was 534.7 mm (2006) and the lowest was 266.2 mm (2009). The ETMODIS results were validated for each catchment using the Open Top Chamber (OTC) which sums the water lost from vegetation and soil within the chamber. This validation was conducted during the growing season of 2010–11. Wind speed; relative humidity and temperature were measured both at the inlet and the outlet of the chamber on five clear sunny days for each 1 km pixel. ETa for the same period was compared to the OTC ET (ETOTC) using the regression analysis and a good relationship was observed with the r2 of 0.7065. The relationship observed confirmed that ETOTC closely approximates ETMODIS and that the OTC can be used as a tool to validate MODIS LAI ET on clear, low winds and sunny days. In order to demonstrate proof-of-concept for the use of this modeling of ETMODIS within a Payment for Ecosystem Services framework, the approach was applied to two other quaternary catchments under communal tenure. Within each catchment, three land use scenarios were created for each catchment to reflect potential changes in the standing aboveground biomass. For Scenario 1, the status quo was maintained; for Scenario 2, MODIS pixels representing 28 km in each catchment were selected and the LAI of these pixels was doubled; and for scenario 3, LAI was halved. ETMODIS was calculated for each scenario by adjusting the ET0 data from a nearby automatic weather station with the MODIS LAI product. The results showed that the estimated annual ETMODIS obtained from the high biomass catchment was 111 mm greater than that obtained from the low biomass catchment. When comparing between the scenarios, the annual ETMODIS obtained from scenario 2 was the highest of the 3 scenarios for both sites. These results confirm that increased leaf area results in higher annual ETMODIS. This has a positive long term impact on stream flow, as high grass biomass allows the rainfall to infiltrate the soil and be gradually released to the dams with reduced magnitude of storm flows. This approach has the potential to quantify the benefits to down-stream water users of improving above-ground biomass in catchments.
- Full Text:
- Date Issued: 2011