An assessment of intellectual development in a group of black mineworkers
- Authors: Liddle, Richard Allan
- Date: 2013-03-22
- Subjects: Piaget, Jean, 1896-1980 Intellect Gold miners -- Psychology Black people -- Intelligence levels -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3122 , http://hdl.handle.net/10962/d1006115
- Description: The aim of this research is to investigate intellectual development of a group of Black mineworkers on a South African gold mine, in the light of their exposure to a technical industrial environment. The research was conducted within a Piagetian framework and attempts to establish:- 1. A conceptual profile which would highlight the subject's conceptual abilities in relation to job skill requirements. 2. An empirical analysis of combined Behavioural and 3. Explanatory responses to support the hypothesis that experienced Black mineworkers should perform better on the diagnostic battery than novices: the main reason for this being the contention that conceptual development is facilitated by cognitive adaptation to the demands of a selectively different technological environment. Whether the battery of Piagetian conservation tasks could be evaluated for use as conservation scales with sound statistical properties. A random sample of fifty six Black mine workers was realised and their performance indicated that:- a ) The concept of Force is not actively developed by mining. b) There was no significant difference in the performance of Novice and Experienced subjects. c) The diagnostic battery in its present form is inadequate and would have to undergo some relative modifications. d) Conceptual profiles showed that concept areas tapped were not developed past the stage of Concrete operations, and that in some instances subjects did not conserve concepts which are relevant to the occupation they were selected for on the Classification Test Battery. e) Piagetian methodology could only be selectively applied to the mining industry for purposes of selection and placement. f) Conservation scales were not realised because of anomalies found in the composition of sub-concepts in the battery. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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- Authors: Liddle, Richard Allan
- Date: 2013-03-22
- Subjects: Piaget, Jean, 1896-1980 Intellect Gold miners -- Psychology Black people -- Intelligence levels -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3122 , http://hdl.handle.net/10962/d1006115
- Description: The aim of this research is to investigate intellectual development of a group of Black mineworkers on a South African gold mine, in the light of their exposure to a technical industrial environment. The research was conducted within a Piagetian framework and attempts to establish:- 1. A conceptual profile which would highlight the subject's conceptual abilities in relation to job skill requirements. 2. An empirical analysis of combined Behavioural and 3. Explanatory responses to support the hypothesis that experienced Black mineworkers should perform better on the diagnostic battery than novices: the main reason for this being the contention that conceptual development is facilitated by cognitive adaptation to the demands of a selectively different technological environment. Whether the battery of Piagetian conservation tasks could be evaluated for use as conservation scales with sound statistical properties. A random sample of fifty six Black mine workers was realised and their performance indicated that:- a ) The concept of Force is not actively developed by mining. b) There was no significant difference in the performance of Novice and Experienced subjects. c) The diagnostic battery in its present form is inadequate and would have to undergo some relative modifications. d) Conceptual profiles showed that concept areas tapped were not developed past the stage of Concrete operations, and that in some instances subjects did not conserve concepts which are relevant to the occupation they were selected for on the Classification Test Battery. e) Piagetian methodology could only be selectively applied to the mining industry for purposes of selection and placement. f) Conservation scales were not realised because of anomalies found in the composition of sub-concepts in the battery. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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A contribution to the ecology and systematics of the genus Petrotilapia (Pisces : Cichlidae) in Lake Malawi
- Authors: Marsh, Alan Clive
- Date: 2013-03-20
- Subjects: Cichlids -- Nyasa, Lake , Petrotilapia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5355 , http://hdl.handle.net/10962/d1009513 , Cichlids -- Nyasa, Lake , Petrotilapia
- Description: The nominal species Petrotilapia tridentiger Trewavas, a rock-frequenting fish from Lake Malawi, occurs in three distinct male and female colour forms at Monkey Bay. Field observations on courtship and aggression indicate that the three colour forms are distinct species. The taxonomy of the three species of Petrotilapia that occur at Monkey Bay is revised. R. tridentiger is redescribed and two new species, P. genalutea and P. nigra, are described. The three species are very similar morphologically and are considered to be sibling species. The only morphological character which reliably separates the three sibling species is live coloration: Live coloration is considered to be an important component of the specific mate recognition systems in Petrotilapia species. The coloration of a further fourteen forms of Petrotilapia is described and it is suggested that these forms are valid species. Space resource partitioning plays an important role in facilitating the coexistence of Petrotilapia sibling species. Space is partially partitioned in terms of depth range. In shallow water, where all three species are sympatric, there are differences in the feeding sites used by the various Petrotilapia forms. Changes in niche breadth and overlap, which are associated with changes in the abundance of epilithic algae, indicate that competition for feeding space occurs between the three Petrotilapia species. The Petrotilapia species partition their resources according to a social dominance hierarchy. Dominant forms, such as territorial males, R. tridentiger females and schooling R. genalutea females, have access to rich food supplies which occur within the territories of certain highly aggressive Pseudotronheus species. are facultative and opportunistic .feeders. Petrotilapia species Speciation in allopatry is considered to be the mechanism which adequately explains the current diversity of the genus Petrotilapia. The importance of an integrative approach to future systematic and ecological research on Lake Malawi cichlids is stressed. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
- Full Text:
- Authors: Marsh, Alan Clive
- Date: 2013-03-20
- Subjects: Cichlids -- Nyasa, Lake , Petrotilapia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5355 , http://hdl.handle.net/10962/d1009513 , Cichlids -- Nyasa, Lake , Petrotilapia
- Description: The nominal species Petrotilapia tridentiger Trewavas, a rock-frequenting fish from Lake Malawi, occurs in three distinct male and female colour forms at Monkey Bay. Field observations on courtship and aggression indicate that the three colour forms are distinct species. The taxonomy of the three species of Petrotilapia that occur at Monkey Bay is revised. R. tridentiger is redescribed and two new species, P. genalutea and P. nigra, are described. The three species are very similar morphologically and are considered to be sibling species. The only morphological character which reliably separates the three sibling species is live coloration: Live coloration is considered to be an important component of the specific mate recognition systems in Petrotilapia species. The coloration of a further fourteen forms of Petrotilapia is described and it is suggested that these forms are valid species. Space resource partitioning plays an important role in facilitating the coexistence of Petrotilapia sibling species. Space is partially partitioned in terms of depth range. In shallow water, where all three species are sympatric, there are differences in the feeding sites used by the various Petrotilapia forms. Changes in niche breadth and overlap, which are associated with changes in the abundance of epilithic algae, indicate that competition for feeding space occurs between the three Petrotilapia species. The Petrotilapia species partition their resources according to a social dominance hierarchy. Dominant forms, such as territorial males, R. tridentiger females and schooling R. genalutea females, have access to rich food supplies which occur within the territories of certain highly aggressive Pseudotronheus species. are facultative and opportunistic .feeders. Petrotilapia species Speciation in allopatry is considered to be the mechanism which adequately explains the current diversity of the genus Petrotilapia. The importance of an integrative approach to future systematic and ecological research on Lake Malawi cichlids is stressed. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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'n Ondersoek na aspekte van die verhouding tussen betrokkenheid en universaliteit in die literatuur
- Authors: Weideman, George, 1947-2008
- Date: 1982
- Subjects: Politics and literature Comparative literature
- Language: Afrikaans
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3604 , http://hdl.handle.net/10962/d1003723
- Description: Voorwoord: In die loop van hierdie studie word dit op enkele plekke duidelik gestel dat die littérature engagée nie beperk is tot die engere "politiek" nie, en dat 'n teks met 'n religieuse tema of 'n teks waarin maatskaplike wantoestande aan die lig gebring word, ook engagé kan wees. Die politiek laat hom egter as magsfaktor oor so 'n wye gebied geld dat nuanserings nie altyd moontlik is nie; 'n teks met 'n oorwegend "religieuse tema" kan politieke implikasies hê. Dit bring verder mee dat selfs 'n teks of 'n bundel waarin géén politieke verwysing voorkom nie, na 'n polities-gemotiveerde keuse teruggevoer word. Die kern van die saak is dat 'n teks tot hierdie subgenre gereken kan word slegs wanneer dit minder of meer uitdruklik kontesteer, of die klimaat skep vir kontestering, wat meebring dat 'n imperatief tot verandering in die teks aanwesig moet wees. Hierdie appél tot verandering rig hom in die beduidendste werke van die genre verbý die partypolitiek, rig hom tot die mens wat (met of sonder sy keuse) onderhewig is aan politieke gebeure. Kontestering (verset) impl iseer ook meebelewing, solidariteit en vereenselwiging. Dit is die oogmerk van hierdie studie om na te gaan hoe aspekte van hierdie vereenselwiging die engagement en die universele waarheid as temamoment en selfs as struktuurfaktor in homself kan verenig. Vanweë die omvang van die teoretiese inset van die studie word tekste in hoofsaak eksemplaries gebruik - déégliker struktulrele analises waarin die estetiese steeds sáám met die die maatskaplik-etiese dimensie ondersoek word, verg 'n afsonderlike studie.
- Full Text:
- Authors: Weideman, George, 1947-2008
- Date: 1982
- Subjects: Politics and literature Comparative literature
- Language: Afrikaans
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3604 , http://hdl.handle.net/10962/d1003723
- Description: Voorwoord: In die loop van hierdie studie word dit op enkele plekke duidelik gestel dat die littérature engagée nie beperk is tot die engere "politiek" nie, en dat 'n teks met 'n religieuse tema of 'n teks waarin maatskaplike wantoestande aan die lig gebring word, ook engagé kan wees. Die politiek laat hom egter as magsfaktor oor so 'n wye gebied geld dat nuanserings nie altyd moontlik is nie; 'n teks met 'n oorwegend "religieuse tema" kan politieke implikasies hê. Dit bring verder mee dat selfs 'n teks of 'n bundel waarin géén politieke verwysing voorkom nie, na 'n polities-gemotiveerde keuse teruggevoer word. Die kern van die saak is dat 'n teks tot hierdie subgenre gereken kan word slegs wanneer dit minder of meer uitdruklik kontesteer, of die klimaat skep vir kontestering, wat meebring dat 'n imperatief tot verandering in die teks aanwesig moet wees. Hierdie appél tot verandering rig hom in die beduidendste werke van die genre verbý die partypolitiek, rig hom tot die mens wat (met of sonder sy keuse) onderhewig is aan politieke gebeure. Kontestering (verset) impl iseer ook meebelewing, solidariteit en vereenselwiging. Dit is die oogmerk van hierdie studie om na te gaan hoe aspekte van hierdie vereenselwiging die engagement en die universele waarheid as temamoment en selfs as struktuurfaktor in homself kan verenig. Vanweë die omvang van die teoretiese inset van die studie word tekste in hoofsaak eksemplaries gebruik - déégliker struktulrele analises waarin die estetiese steeds sáám met die die maatskaplik-etiese dimensie ondersoek word, verg 'n afsonderlike studie.
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A commentary on Nepos' Life of Alcibiades
- Authors: Jackson, John Leonard
- Date: 1982
- Subjects: Classical biography -- Criticism and interpretation , Nepos, Cornelius -- Life Of Alcibiades -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3621 , http://hdl.handle.net/10962/d1007223
- Description: From Introduction: Much of the commentary is historical and biographical in its emphasis. In making detailed reference to other accounts , I have tried to fill important gaps in Nepos' brief and (in places) abrupt account, to compare the picture of Alcibiades in his account with that of other accounts and to trace sources which he may have used important passages have been quoted in full so that verbal similarities can be seen. A striking feature of Nepos' work is his tendency to describe many non-Roman situations in Roman terms. This reflects not only his vagueness about details (a common fault in his writing), but also perhaps a desire to make his Lives more relevant to his reading public and thus more readable. From antiquity to the present day biography and history have tended to be distinguished from each other, and biography has had the greater popular appeal. Readability is perhaps the most abiding quality of Nepos' Lives and Alcibiades may be the most readable of them all. On the whole Nepos portrays him consistently, although of course he also emphasises the inconsistency which was such an important part of his nature. He has told the story simply, yet dramatically; many of the complicated details about Alcibiades are omitted, yet particular incidents are highlighted, notably the return to Athens and the assassination. Above all, from Nepos' Life there emerges the impression that Alcibiades was unique and worth writing about.
- Full Text:
- Authors: Jackson, John Leonard
- Date: 1982
- Subjects: Classical biography -- Criticism and interpretation , Nepos, Cornelius -- Life Of Alcibiades -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3621 , http://hdl.handle.net/10962/d1007223
- Description: From Introduction: Much of the commentary is historical and biographical in its emphasis. In making detailed reference to other accounts , I have tried to fill important gaps in Nepos' brief and (in places) abrupt account, to compare the picture of Alcibiades in his account with that of other accounts and to trace sources which he may have used important passages have been quoted in full so that verbal similarities can be seen. A striking feature of Nepos' work is his tendency to describe many non-Roman situations in Roman terms. This reflects not only his vagueness about details (a common fault in his writing), but also perhaps a desire to make his Lives more relevant to his reading public and thus more readable. From antiquity to the present day biography and history have tended to be distinguished from each other, and biography has had the greater popular appeal. Readability is perhaps the most abiding quality of Nepos' Lives and Alcibiades may be the most readable of them all. On the whole Nepos portrays him consistently, although of course he also emphasises the inconsistency which was such an important part of his nature. He has told the story simply, yet dramatically; many of the complicated details about Alcibiades are omitted, yet particular incidents are highlighted, notably the return to Athens and the assassination. Above all, from Nepos' Life there emerges the impression that Alcibiades was unique and worth writing about.
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A household survey into the nutritional status of rural black pre-school children in the Dias Divisional Council area, Eastern Cape
- Authors: Fincham, Robert John
- Date: 1982
- Subjects: Nutrition surveys -- South Africa -- Eastern Cape Children, Black -- Nutrition -- South Africa -- Eastern Cape Malnutrition -- South Africa -- Eastern Cape Children -- South Africa -- Nutrition
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2183 , vital:20263 , ISBN 0868100927
- Description: This paper reports on an extended research project undertaken during the last two years. Mr R.J. Fincham, the project leader and author of the paper, published a Working Paper during 1981 which presented preliminary results of survey data collected in the Albany Magisterial District of the Eastern Cape. Subsequently, the scope of the project was broadened to include the whole Dias Divisional Council area of jurisdiction, and research methods were refined as a result of the first survey. The project was undertaken under the auspices of the Institute of Social and Economic Research of Rhodes University. Close cooperation with the Port Elizabeth Regional Office of the Department of Health was maintained throughout, and the involvement of the Regional Director, Dr J.D. Krynauw, as well as nurses on his staff, were available. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Authors: Fincham, Robert John
- Date: 1982
- Subjects: Nutrition surveys -- South Africa -- Eastern Cape Children, Black -- Nutrition -- South Africa -- Eastern Cape Malnutrition -- South Africa -- Eastern Cape Children -- South Africa -- Nutrition
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2183 , vital:20263 , ISBN 0868100927
- Description: This paper reports on an extended research project undertaken during the last two years. Mr R.J. Fincham, the project leader and author of the paper, published a Working Paper during 1981 which presented preliminary results of survey data collected in the Albany Magisterial District of the Eastern Cape. Subsequently, the scope of the project was broadened to include the whole Dias Divisional Council area of jurisdiction, and research methods were refined as a result of the first survey. The project was undertaken under the auspices of the Institute of Social and Economic Research of Rhodes University. Close cooperation with the Port Elizabeth Regional Office of the Department of Health was maintained throughout, and the involvement of the Regional Director, Dr J.D. Krynauw, as well as nurses on his staff, were available. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
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A parser generator system to handle complete syntax
- Authors: Ossher, Harold Leon
- Date: 1982
- Subjects: Grammar, Comparative and general -- Syntax Parsing (Computer grammar) Programming languages (Electronic computers) Compilers (Computer programs)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4571 , http://hdl.handle.net/10962/d1002036
- Description: To define a language completely, it is necessary to define both its syntax and semantics. If these definitions are in a suitable form, the parser and code-generator of a compiler, respectively, can be generated from them. This thesis addresses the problem of syntax definition and automatic parser generation.
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- Authors: Ossher, Harold Leon
- Date: 1982
- Subjects: Grammar, Comparative and general -- Syntax Parsing (Computer grammar) Programming languages (Electronic computers) Compilers (Computer programs)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4571 , http://hdl.handle.net/10962/d1002036
- Description: To define a language completely, it is necessary to define both its syntax and semantics. If these definitions are in a suitable form, the parser and code-generator of a compiler, respectively, can be generated from them. This thesis addresses the problem of syntax definition and automatic parser generation.
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A phenomenological study of psychotherapy: a client explicates his experience
- Authors: Frank, Anthony Ernest
- Date: 1982
- Subjects: Psychotherapy -- Research , Insight in psychotherapy , Psychotherapy -- Case studies , Psychotherapy patients
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3128 , http://hdl.handle.net/10962/d1006344 , Psychotherapy -- Research , Insight in psychotherapy , Psychotherapy -- Case studies , Psychotherapy patients
- Description: From Introduction: This thesis involves a detailed explication of my experience as a client in psychotherapy. Being in therapy has brought about extremely important ·changes in my life and continues to do so. Being involved · in the field of· psychology as a student and therapist-to-be, the experience of therapy has also been a valuable source of a greater understanding of the process itself. The various facets of the importance of my experience of psychotherapy will become clear in my explication. It is a fact that experience, which is an essential aspect of our humanness, has been sadly neglected in psychological research. It is surely psychology's task to explore all aspects of humanity, and this neglect of experience has only fairly recently been questioned. Its reasons have been psychology's bias towards the natural sciences whose methods are not suitable for the study of experience. The tremendous achievements of the natural sciences caused psychology to adopt this slant, as Sigmund Koch (19.69) puts it, "The stipulation that psychology be adequate · to science outweighed the commitment that it be adequate to man". (p 65).
- Full Text:
- Authors: Frank, Anthony Ernest
- Date: 1982
- Subjects: Psychotherapy -- Research , Insight in psychotherapy , Psychotherapy -- Case studies , Psychotherapy patients
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3128 , http://hdl.handle.net/10962/d1006344 , Psychotherapy -- Research , Insight in psychotherapy , Psychotherapy -- Case studies , Psychotherapy patients
- Description: From Introduction: This thesis involves a detailed explication of my experience as a client in psychotherapy. Being in therapy has brought about extremely important ·changes in my life and continues to do so. Being involved · in the field of· psychology as a student and therapist-to-be, the experience of therapy has also been a valuable source of a greater understanding of the process itself. The various facets of the importance of my experience of psychotherapy will become clear in my explication. It is a fact that experience, which is an essential aspect of our humanness, has been sadly neglected in psychological research. It is surely psychology's task to explore all aspects of humanity, and this neglect of experience has only fairly recently been questioned. Its reasons have been psychology's bias towards the natural sciences whose methods are not suitable for the study of experience. The tremendous achievements of the natural sciences caused psychology to adopt this slant, as Sigmund Koch (19.69) puts it, "The stipulation that psychology be adequate · to science outweighed the commitment that it be adequate to man". (p 65).
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A revision of the genus fockea endl. (Asclepiadaceae)
- Authors: Court, Doreen
- Date: 1982 , 2013-04-10
- Subjects: Asclepiadaceae
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4242 , http://hdl.handle.net/10962/d1007072 , Asclepiadaceae
- Description: A taxonomic revision of Fockea Endl. (Asclepiadaceae) is presented in which 5 species are recognised. Descriptions, illustrations and a key to the species are provided. F. comaru (E. Mey.)N.E.Br. is presented sensu lato, and because of its earlier publication in 1838 takes priority over F. angustifolia K. Schum. which was described in 1893. Historical and ecological notes on the genus are given and phylogenetic conclusions drawn. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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- Authors: Court, Doreen
- Date: 1982 , 2013-04-10
- Subjects: Asclepiadaceae
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4242 , http://hdl.handle.net/10962/d1007072 , Asclepiadaceae
- Description: A taxonomic revision of Fockea Endl. (Asclepiadaceae) is presented in which 5 species are recognised. Descriptions, illustrations and a key to the species are provided. F. comaru (E. Mey.)N.E.Br. is presented sensu lato, and because of its earlier publication in 1838 takes priority over F. angustifolia K. Schum. which was described in 1893. Historical and ecological notes on the genus are given and phylogenetic conclusions drawn. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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A teacher's perception of his professional role : a developmental study
- Authors: Morwood, G E
- Date: 1982
- Subjects: Teachers -- Job satisfaction
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1341 , http://hdl.handle.net/10962/d1001407
- Description: This then was the object of this study, to determine 1) whether there is a pattern of attitude change common to teachers; II) whether early experience brings about different patterns of change among teachers; lll) whether specific life crises and events bring about these changes; lV) whether changes in attitudes occur at different stages in the teacher's career (Introduction, p. 12)
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- Authors: Morwood, G E
- Date: 1982
- Subjects: Teachers -- Job satisfaction
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1341 , http://hdl.handle.net/10962/d1001407
- Description: This then was the object of this study, to determine 1) whether there is a pattern of attitude change common to teachers; II) whether early experience brings about different patterns of change among teachers; lll) whether specific life crises and events bring about these changes; lV) whether changes in attitudes occur at different stages in the teacher's career (Introduction, p. 12)
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A wild fig tree growing out of a stone wall ruins
- Authors: Skead, C J (Cuthbert John)
- Date: 1982
- Subjects: Ficus (Plants) -- South Africa -- Photographs , Fig -- South Africa -- Photographs
- Language: English
- Type: mixed material , photographs , landscape photographs
- Identifier: http://hdl.handle.net/10962/73521 , vital:30200
- Description: Caption: "A wild fig tree growing out of the stone wall ruins of the fort at Kaffir Drift on the Great Fish River, Bathurst district. 1982. The site of the old fort is now a police station."
- Full Text: false
- Authors: Skead, C J (Cuthbert John)
- Date: 1982
- Subjects: Ficus (Plants) -- South Africa -- Photographs , Fig -- South Africa -- Photographs
- Language: English
- Type: mixed material , photographs , landscape photographs
- Identifier: http://hdl.handle.net/10962/73521 , vital:30200
- Description: Caption: "A wild fig tree growing out of the stone wall ruins of the fort at Kaffir Drift on the Great Fish River, Bathurst district. 1982. The site of the old fort is now a police station."
- Full Text: false
Accounting education and the corporate reporting function : inaugural lecture delivered at Rhodes University
- Authors: Prinsloo, K S
- Date: 1982
- Subjects: Accounting -- Study and teaching , Accounting -- Developing countries
- Language: English
- Type: Text
- Identifier: vital:659 , http://hdl.handle.net/10962/d1020728
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Authors: Prinsloo, K S
- Date: 1982
- Subjects: Accounting -- Study and teaching , Accounting -- Developing countries
- Language: English
- Type: Text
- Identifier: vital:659 , http://hdl.handle.net/10962/d1020728
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
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An ecological study of territoriality in four Cichlid species resident on rocky shores near Monkey Bay, Lake Malawi
- Authors: Sharp, Bradley John
- Date: 1982
- Subjects: Cichlids -- Nyasa, Lake , Cichlids -- Behavior
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5340 , http://hdl.handle.net/10962/d1005927 , Cichlids -- Nyasa, Lake , Cichlids -- Behavior
- Description: This study centres on a diverse assemblage of epilithic algal grazing fish (17 cichlids and 2 cyprinids) found on the rocky shores near Monkey Bay, Lake Malawi. Diet overlap among these species is large, but competitive exclusion is apparently avoided by the species having different feeding structures, behaviour and distribution on the shore. In many respects the ecology and behaviour of the cichlid fishes inhabiting the rocky zones of Lake Malawi parallel those of coral reef fish. In both communities there are species which are highly territorial, resulting in resource subdivision and, in some cases, the development of algal gardens. As this behaviour has not been previously reported for cichlid species, this thesis describes the territoriality of the rock-dwelling cichlids of Monkey Bay, Lake Malawi, and poses three specific questions: 1. What is the function of territoriality? 2. How do the territorial species subdivide the space resource? 3. What prevents one species taking over all the available space? It is suggested that interspecific territoriality evolved in response to a shortage of food, and, at present, serves principally to defend an algal garden i.e. a food supply of high standing crop. The species studied are extremely site specific. The rocky shore is subdivided among the four species according to the rock configuration, size, algal mat composition and position on the shore, of the available sites. An experimental study of the space utilization of the two common territorial species, referred to as 'Pseudotropheus orange cheek' and 'Pseudotropheus aggressive', showed that suitable territory sites are in short supply and that these species are in competition for some sites. These results do not support those of Fryer (1959) who suggested that a superabundance of food enabled fish to coexist by sharing the same food resource. Indeed it now appears that a shortage of food may have been a major driving force during the recent evolution of the species studied.
- Full Text:
- Authors: Sharp, Bradley John
- Date: 1982
- Subjects: Cichlids -- Nyasa, Lake , Cichlids -- Behavior
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5340 , http://hdl.handle.net/10962/d1005927 , Cichlids -- Nyasa, Lake , Cichlids -- Behavior
- Description: This study centres on a diverse assemblage of epilithic algal grazing fish (17 cichlids and 2 cyprinids) found on the rocky shores near Monkey Bay, Lake Malawi. Diet overlap among these species is large, but competitive exclusion is apparently avoided by the species having different feeding structures, behaviour and distribution on the shore. In many respects the ecology and behaviour of the cichlid fishes inhabiting the rocky zones of Lake Malawi parallel those of coral reef fish. In both communities there are species which are highly territorial, resulting in resource subdivision and, in some cases, the development of algal gardens. As this behaviour has not been previously reported for cichlid species, this thesis describes the territoriality of the rock-dwelling cichlids of Monkey Bay, Lake Malawi, and poses three specific questions: 1. What is the function of territoriality? 2. How do the territorial species subdivide the space resource? 3. What prevents one species taking over all the available space? It is suggested that interspecific territoriality evolved in response to a shortage of food, and, at present, serves principally to defend an algal garden i.e. a food supply of high standing crop. The species studied are extremely site specific. The rocky shore is subdivided among the four species according to the rock configuration, size, algal mat composition and position on the shore, of the available sites. An experimental study of the space utilization of the two common territorial species, referred to as 'Pseudotropheus orange cheek' and 'Pseudotropheus aggressive', showed that suitable territory sites are in short supply and that these species are in competition for some sites. These results do not support those of Fryer (1959) who suggested that a superabundance of food enabled fish to coexist by sharing the same food resource. Indeed it now appears that a shortage of food may have been a major driving force during the recent evolution of the species studied.
- Full Text:
An ecophysiological study of the effects of changes in salinity and temperature on the distribution of Macrobrachium Petersi (Hilgendorf) in the Keiskamma river and estuary
- Read, Graeme Hamilton Leonard
- Authors: Read, Graeme Hamilton Leonard
- Date: 1982
- Subjects: Macrobrachium -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5804 , http://hdl.handle.net/10962/d1006304
- Description: Summary: The distribution of adult, juvenile, post larval and larval Macrobrachium petersi (Hilgendorf) was studied in relation to temperature and salinity in the Keiskamma river and estuary from May 1979 to May 1981. M. petersi is a subtropical species, which confined activity of all stages in the field to the summer months. Variable freshwater discharge and tidal effects determined the salinity and temperature profiles in the middle and upper reaches of the Keiskamma estuary. Thus, a dry 1979/80 summer and a wet 1980/81 summer markedly influenced the abundance and distribution of adult M. petersi in the river and estuary respectively. Adult M. petersi migrate to the estuary under flooding conditions and upstream in response to elevated salinities. Although M. petersi has nine larval stages only a preponderance of stage I were caught in the field. These portray a distinct nocturnal and diurnal distribution pattern which is influenced by salinity, especially under stratified conditions. After flooding the larvae show an affinity for salt front regions and reach these by remaining in the water column on the ebbing tide. A substantial drop in abundance downstream from the salt front suggests that the larvae loose their planktonic phase which is an effective retention mechanism, and confines larval development to the middle and upper reaches of the estuary. Post larvae were caught towards the end of the 1981 breeding season which indicates that complete larval development takes place in the estuary. A post larval migration to freshwater, which reaches a peak in February and March, was monitored. Thus both the freshwater and estuarine environments form an inseparable link in the life cycle of M. petersi. The distribution of stage I larvae in the Keiskamma estuary suggested that salinity played a role in development. The fact that other larval stages were not found emphasised the necessity for a quantitative laboratory investigation to determine the importance of salinity in the developmental history of M. petersi larvae and post larvae. However, the modifying influence of temperature could not be ignored so a multivariable approach was adopted. This, together with a surface response technique, aided the interpretation of the effect of a variety of combinations of salinity and temperature on ecdysis to stage II, larval survival and requirements for metamorphosis to post larvae. It was estimated that the minimum salinity requirement for complete larval development, within a temperature range from 18 to 30⁰C was 8%₀, although ecdysis to stage II and metamorphosis to post larvae could occur in salinities less than this value. Despite the euryhalinity of the larvae, the behaviour of adult M. petersi to an increase in salinity and the affinity of stage I larvae to salt front regions restricted development to the upper reaches of the estuary. This is discussed as an adaptation which not only ensures retention within the estuary but favours recruitment to the adult population in freshwater. The osmoregulatory patterns of larval, post larval, juvenile and adult M. petersi correlated with their distribution. These were approximated by a cubic polynomial which enabled the different patterns to be compared. The larval stages investigated (I, II, V & IX) displayed a remarkable capacity to regulate which was strongest in stage I as these could regulate in both freshwater and 35%₀. The ability to regulate in freshwater was lost hereafter but regained in the post larvae, which also regulated in 35%₀. Juveniles (caught at the ebb and flow) displayed a similar regulatory pattern to the adults and "hyposmoconformed" in salinities beyond the isosmotic point as the need to regulate in 35%₀ was no longer necessary. The osmoregulatory capacity of M. petersi larvae in relation to other decapod larvae is discussed. Marine transport of the euryhaline larval and post larval stages accounts for the distribution of M. petersi along the South African coastline. However, south of 31°S latitude the sea-surface temperature decreases abruptly. This region coincides with the southern limit of the distribution of M. petersi. Although larval M. petersi can tolerate high salinity (35%₀) in combination with low temperature, the post larvae cannot, which is likely to account for their restricted southern distribution. The genus Macrobrachium are in the process of invading freshwater. The possible course that this might have taken has been discussed in the light of available evidence as well as the findings of this study.
- Full Text:
- Authors: Read, Graeme Hamilton Leonard
- Date: 1982
- Subjects: Macrobrachium -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5804 , http://hdl.handle.net/10962/d1006304
- Description: Summary: The distribution of adult, juvenile, post larval and larval Macrobrachium petersi (Hilgendorf) was studied in relation to temperature and salinity in the Keiskamma river and estuary from May 1979 to May 1981. M. petersi is a subtropical species, which confined activity of all stages in the field to the summer months. Variable freshwater discharge and tidal effects determined the salinity and temperature profiles in the middle and upper reaches of the Keiskamma estuary. Thus, a dry 1979/80 summer and a wet 1980/81 summer markedly influenced the abundance and distribution of adult M. petersi in the river and estuary respectively. Adult M. petersi migrate to the estuary under flooding conditions and upstream in response to elevated salinities. Although M. petersi has nine larval stages only a preponderance of stage I were caught in the field. These portray a distinct nocturnal and diurnal distribution pattern which is influenced by salinity, especially under stratified conditions. After flooding the larvae show an affinity for salt front regions and reach these by remaining in the water column on the ebbing tide. A substantial drop in abundance downstream from the salt front suggests that the larvae loose their planktonic phase which is an effective retention mechanism, and confines larval development to the middle and upper reaches of the estuary. Post larvae were caught towards the end of the 1981 breeding season which indicates that complete larval development takes place in the estuary. A post larval migration to freshwater, which reaches a peak in February and March, was monitored. Thus both the freshwater and estuarine environments form an inseparable link in the life cycle of M. petersi. The distribution of stage I larvae in the Keiskamma estuary suggested that salinity played a role in development. The fact that other larval stages were not found emphasised the necessity for a quantitative laboratory investigation to determine the importance of salinity in the developmental history of M. petersi larvae and post larvae. However, the modifying influence of temperature could not be ignored so a multivariable approach was adopted. This, together with a surface response technique, aided the interpretation of the effect of a variety of combinations of salinity and temperature on ecdysis to stage II, larval survival and requirements for metamorphosis to post larvae. It was estimated that the minimum salinity requirement for complete larval development, within a temperature range from 18 to 30⁰C was 8%₀, although ecdysis to stage II and metamorphosis to post larvae could occur in salinities less than this value. Despite the euryhalinity of the larvae, the behaviour of adult M. petersi to an increase in salinity and the affinity of stage I larvae to salt front regions restricted development to the upper reaches of the estuary. This is discussed as an adaptation which not only ensures retention within the estuary but favours recruitment to the adult population in freshwater. The osmoregulatory patterns of larval, post larval, juvenile and adult M. petersi correlated with their distribution. These were approximated by a cubic polynomial which enabled the different patterns to be compared. The larval stages investigated (I, II, V & IX) displayed a remarkable capacity to regulate which was strongest in stage I as these could regulate in both freshwater and 35%₀. The ability to regulate in freshwater was lost hereafter but regained in the post larvae, which also regulated in 35%₀. Juveniles (caught at the ebb and flow) displayed a similar regulatory pattern to the adults and "hyposmoconformed" in salinities beyond the isosmotic point as the need to regulate in 35%₀ was no longer necessary. The osmoregulatory capacity of M. petersi larvae in relation to other decapod larvae is discussed. Marine transport of the euryhaline larval and post larval stages accounts for the distribution of M. petersi along the South African coastline. However, south of 31°S latitude the sea-surface temperature decreases abruptly. This region coincides with the southern limit of the distribution of M. petersi. Although larval M. petersi can tolerate high salinity (35%₀) in combination with low temperature, the post larvae cannot, which is likely to account for their restricted southern distribution. The genus Macrobrachium are in the process of invading freshwater. The possible course that this might have taken has been discussed in the light of available evidence as well as the findings of this study.
- Full Text:
An evaluation of the effects of imported insects on the weed Lantana camara L. in South Africa
- Authors: Cilliers, Catharina Johanna
- Date: 1982
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5808 , http://hdl.handle.net/10962/d1006853
- Description: The plant, Lantana camara L. (V erbenaceae), is a weed in tropical and subtropical areas around the world. In many countries, including South Africa, biological control of this weed has been attempted. Although 12 insect species have been imported into South Africa, only four species established and these are dealt with in this study. Ophiomyia lantanae Diptera: Agromyzidae, a seed fly, is briefly dealt with; the main emphasis is on the leaf damaging species Teleonemia scrupulosa Stål (Hemiptera: Tingidae) and two leaf mining beetles, Octotoma scabripennis Guerin and Uroplata girardi Pic . (Hispidae: Coleoptera). In evaluating the insect damage to lantana leaves, monthly samples of branches were taken over three seasons from 1977- 80. This destructive sampling allowed the study of population build-up of the insects. In addition, counts were made of the numbers of damaged and healthy leaves, flowers and seeds and the damage related to the activities of the different stages of the hispids and the tingid. Insect exclusion experiments were also used to determine the effect of the insects on the growth of L. camara. The results reported in this thesis clearly indicate that the imported natural enemies retard L. camara growth and vigour and the effects are manifested in a marked reduction in stem diameter, internodal length, leaf size, leaf lifespan and in flower and seed set.
- Full Text:
- Authors: Cilliers, Catharina Johanna
- Date: 1982
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5808 , http://hdl.handle.net/10962/d1006853
- Description: The plant, Lantana camara L. (V erbenaceae), is a weed in tropical and subtropical areas around the world. In many countries, including South Africa, biological control of this weed has been attempted. Although 12 insect species have been imported into South Africa, only four species established and these are dealt with in this study. Ophiomyia lantanae Diptera: Agromyzidae, a seed fly, is briefly dealt with; the main emphasis is on the leaf damaging species Teleonemia scrupulosa Stål (Hemiptera: Tingidae) and two leaf mining beetles, Octotoma scabripennis Guerin and Uroplata girardi Pic . (Hispidae: Coleoptera). In evaluating the insect damage to lantana leaves, monthly samples of branches were taken over three seasons from 1977- 80. This destructive sampling allowed the study of population build-up of the insects. In addition, counts were made of the numbers of damaged and healthy leaves, flowers and seeds and the damage related to the activities of the different stages of the hispids and the tingid. Insect exclusion experiments were also used to determine the effect of the insects on the growth of L. camara. The results reported in this thesis clearly indicate that the imported natural enemies retard L. camara growth and vigour and the effects are manifested in a marked reduction in stem diameter, internodal length, leaf size, leaf lifespan and in flower and seed set.
- Full Text:
An examination of the finances of the Cape Midlands Administration Board, 1973-79
- Authors: Humphries, Richard G
- Date: 1982
- Subjects: Cape Midlands Administration Board Cities and towns -- South Africa Local government -- South Africa -- Eastern Cape Finance, Public -- South Africa -- Eastern Cape
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2161 , vital:20261 , ISBN 0868100935
- Description: While the Bantu Affairs Administration Board Act was passed by Parliament in 1971, it was not until July 1973 that responsibility for the execution of state policy towards blacks resident in urban areas was removed from the Eastern Cape municipalities and vested in the newly created Cape Midlands Administration Board. The Board's boundaries were announced in December 1972 after the recommendations of the Bantu Affairs Administration Boards Implementation Advisory Committee and were to consist of the magisterial districts of Port Elizabeth, Uitenhage, Kirkwood, Somerset East, Cradock, Bedford, Adelaide, Fort Beaufort, Stockenstrom, Victoria East, Albany, Bathurst, and Alexandria. The head office was based in Port Elizabeth. These boundaries remained unaltered until the amalgamation of the three administration boards in the greater Eastern Cape, Border and Karoo areas in 1979. Although the administration boards were to be primarily concerned with the administration of urban areas, they were also given responsibility for the administration of other aspects of policy towards blacks living in rural areas. Thus the Cape Midlands Administration Board estimated in 1973 that 327 601 persons were resident in the 20 urban areas within its jurisdiction while 163 312 blacks lived in the rural non-prescribed areas. This was a total of 490 913 persons. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Authors: Humphries, Richard G
- Date: 1982
- Subjects: Cape Midlands Administration Board Cities and towns -- South Africa Local government -- South Africa -- Eastern Cape Finance, Public -- South Africa -- Eastern Cape
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2161 , vital:20261 , ISBN 0868100935
- Description: While the Bantu Affairs Administration Board Act was passed by Parliament in 1971, it was not until July 1973 that responsibility for the execution of state policy towards blacks resident in urban areas was removed from the Eastern Cape municipalities and vested in the newly created Cape Midlands Administration Board. The Board's boundaries were announced in December 1972 after the recommendations of the Bantu Affairs Administration Boards Implementation Advisory Committee and were to consist of the magisterial districts of Port Elizabeth, Uitenhage, Kirkwood, Somerset East, Cradock, Bedford, Adelaide, Fort Beaufort, Stockenstrom, Victoria East, Albany, Bathurst, and Alexandria. The head office was based in Port Elizabeth. These boundaries remained unaltered until the amalgamation of the three administration boards in the greater Eastern Cape, Border and Karoo areas in 1979. Although the administration boards were to be primarily concerned with the administration of urban areas, they were also given responsibility for the administration of other aspects of policy towards blacks living in rural areas. Thus the Cape Midlands Administration Board estimated in 1973 that 327 601 persons were resident in the 20 urban areas within its jurisdiction while 163 312 blacks lived in the rural non-prescribed areas. This was a total of 490 913 persons. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
An investigation into the taxonomy of the diatoms (Bacillariophyta) of the Sundays and Great Fish Rivers, with ecological observations on the Sundays River
- Archibald, Robert Eldred Mostert
- Authors: Archibald, Robert Eldred Mostert
- Date: 1982
- Subjects: Diatoms -- South Africa -- Eastern Cape Diatoms -- Classification Aquatic ecology -- South Africa -- Eastern Cape -- Sundays River
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4180 , http://hdl.handle.net/10962/d1003728
- Description: This report on the diatoms (Bacillariophyta) of the Sundays and Great Fish rivers is divided into two sections. In Volume 1 the taxonomy of the diatoms from these two river systems is examined. A total of 331 taxa were studied, of which 5 are described as new species. Two taxa are given new names, since they were previously known under later homonyms. Twenty seven taxa were recorded for the first time from South Africa, while a number of species are given amended descriptions in the light of fresh information obtained concerning them. A few taxa (chiefly South African forms) have been united with previously described taxa. For the remainder of the taxa mentioned in the text, comments are passed with regard to their taxonomy and dimensions, based on facts gained through literature surveys and personal observations of the relevant taxa. As far as possible all taxa examined in Volume 1 are illustrated, and these illustrations are presented in Volume 3 of this study. Volume 2 deals with the ecology of the diatoms in the Sundays River. Special emphasis is laid on relating the composition of the diatom associations at the selected stations to the ambient salinity and ionic composition of the water. A new index, the Salinity Tolerance Index (STI), is proposed to summarize by means of a numerical value the information obtained from the analysis of a diatom association with respect to the character of the component taxa, and to indicate whether the association is derived from a freshwater, brackish water or marine source. The efficacy of the STI is evaluated in the text. The effect of the geological formations of the Sundays River valley and the underground waters emanating from them is discussed in the text. The consequences of a severe drought in the lower Sundays River, including hypersaline water in the upper estuary, on the diatom flora are also investigated.
- Full Text:
- Authors: Archibald, Robert Eldred Mostert
- Date: 1982
- Subjects: Diatoms -- South Africa -- Eastern Cape Diatoms -- Classification Aquatic ecology -- South Africa -- Eastern Cape -- Sundays River
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4180 , http://hdl.handle.net/10962/d1003728
- Description: This report on the diatoms (Bacillariophyta) of the Sundays and Great Fish rivers is divided into two sections. In Volume 1 the taxonomy of the diatoms from these two river systems is examined. A total of 331 taxa were studied, of which 5 are described as new species. Two taxa are given new names, since they were previously known under later homonyms. Twenty seven taxa were recorded for the first time from South Africa, while a number of species are given amended descriptions in the light of fresh information obtained concerning them. A few taxa (chiefly South African forms) have been united with previously described taxa. For the remainder of the taxa mentioned in the text, comments are passed with regard to their taxonomy and dimensions, based on facts gained through literature surveys and personal observations of the relevant taxa. As far as possible all taxa examined in Volume 1 are illustrated, and these illustrations are presented in Volume 3 of this study. Volume 2 deals with the ecology of the diatoms in the Sundays River. Special emphasis is laid on relating the composition of the diatom associations at the selected stations to the ambient salinity and ionic composition of the water. A new index, the Salinity Tolerance Index (STI), is proposed to summarize by means of a numerical value the information obtained from the analysis of a diatom association with respect to the character of the component taxa, and to indicate whether the association is derived from a freshwater, brackish water or marine source. The efficacy of the STI is evaluated in the text. The effect of the geological formations of the Sundays River valley and the underground waters emanating from them is discussed in the text. The consequences of a severe drought in the lower Sundays River, including hypersaline water in the upper estuary, on the diatom flora are also investigated.
- Full Text:
Censorship of the press in South Africa during the Angolan War: a case study of news manipulation and suppression
- Authors: Addison, Graeme
- Date: 1982
- Subjects: Mass media -- Censorship -- South Africa Censorship -- South Africa Mass media -- Censorship -- South Africa Government and the press -- South Africa Freedom of the press -- South Africa Angola -- History -- Civil War, 1975-2002 Angola -- History -- South African Invasion, 1975-1976
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3495 , http://hdl.handle.net/10962/d1003058
- Description: During the Angolan War of 1975-6, whilst South African troops were actively engaged on the side of the Unita/FNLA alliance, news media in South Africa were prohibited from disclosing information about the country's role in the war. Under Section 118 of the Defence Amendment Act of 1967, no information about SA troop movements or plans could be published without the permission of the Minister of Defence or his nominees. This case study shows how the Government used the Defence Act to censor certain news while releasing other news which suited its political outlook and objectives. The study documents the history of the Defence Act and of the military-press liaison machinery which grew out of it. The introduction defines propaganda as a technique of ideological control designed to supplement the control of society by means of repression. The study sets in context the Government's propaganda strategy before, during and after the Angolan War, arguing that the structures of white domination, including the newspaper industry, are being drawn into the Government's scheme of total co-ordination to fight a total war.
- Full Text:
- Authors: Addison, Graeme
- Date: 1982
- Subjects: Mass media -- Censorship -- South Africa Censorship -- South Africa Mass media -- Censorship -- South Africa Government and the press -- South Africa Freedom of the press -- South Africa Angola -- History -- Civil War, 1975-2002 Angola -- History -- South African Invasion, 1975-1976
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3495 , http://hdl.handle.net/10962/d1003058
- Description: During the Angolan War of 1975-6, whilst South African troops were actively engaged on the side of the Unita/FNLA alliance, news media in South Africa were prohibited from disclosing information about the country's role in the war. Under Section 118 of the Defence Amendment Act of 1967, no information about SA troop movements or plans could be published without the permission of the Minister of Defence or his nominees. This case study shows how the Government used the Defence Act to censor certain news while releasing other news which suited its political outlook and objectives. The study documents the history of the Defence Act and of the military-press liaison machinery which grew out of it. The introduction defines propaganda as a technique of ideological control designed to supplement the control of society by means of repression. The study sets in context the Government's propaganda strategy before, during and after the Angolan War, arguing that the structures of white domination, including the newspaper industry, are being drawn into the Government's scheme of total co-ordination to fight a total war.
- Full Text:
Die invloed van die spraakbenadering van onderwys vir dowe kinders op die maatskaplike funksionering van die dowe
- Authors: Heyns, Mimi
- Date: 1982
- Subjects: Deaf children -- Education -- South Africa , Deaf -- Means of communication , Deaf children -- Language , Deaf children -- Family relationships , Deafness -- Social aspects , Deafness -- Psychological aspects , Sociolinguistics , Sign language acquisition , Deaf -- Government policy -- South Africa , Deaf -- Social conditions -- South Africa , Self-perception , Identity (Psychology)
- Language: Afrikaans
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3284 , http://hdl.handle.net/10962/d1006881 , Deaf children -- Education -- South Africa , Deaf -- Means of communication , Deaf children -- Language , Deaf children -- Family relationships , Deafness -- Social aspects , Deafness -- Psychological aspects , Sociolinguistics , Sign language acquisition , Deaf -- Government policy -- South Africa , Deaf -- Social conditions -- South Africa , Self-perception , Identity (Psychology)
- Description: From Introduction: Gehoor speel 'n belangrike rol in die leerproses, in aanpassing by die omgewing asook in aanpassing by sosiale omstandighede. Gehoorverlies plaas die individu in 'n situasie van vereensaming, veroorsaak deur 'n beperktheid in kommunikasievermoë. (Roux, 1979:1) Dr Roux, Direkteur van Gesondheidsdienste van die Departement van Gesondheid, Welsyn en Pensioene, het tydens die Goue Jubileum-Kongres van die Suid-Afrikaanse Nasionale Raad vir Dowes daarop gewys dat gehoorverlies vandag meer Amerikaners affekteer as hartsiektes, kanker, blindheid, tuberkulose, veneriese siektes, sklerose en niersiektes tesame. (Roux, 1979:1) In Suid-Afrika word beraam dat 0,06% van aIle babas totaal doof gebore word en dat die aantal persone met ernstige gehoorprobleme, volgens die skatting van die Departement van Gesondheid, Welsyn en Pensioene, 65 000 beloop. Hierdie getal sluit Swartes uit. (Roux, 1979:1) ... Die probleem van doofheid is kompleks en soms so ingewikkeld dat dit te betwyfel is of die horende individu die omvang daarvan begryp en insig in die situasie van die dowe kan ontwikkel. Empatie met die dowe en begrip vir sy leefwêreld is vir die horende persoon problematies. 'n Wêreld sonder klank is moeilik om te visualiseer en 'n wêreld sonder taal lê buite die begripsvermoë van die horende. Daar bestaan op velerlei gebiede verwarring ten opsigte van die dowe. Die horende persoon besef gewoonlik dat daar 'n eiesoortige wêreld van ervaring en denke vir die dowe is anders as die van die horende, maar begrip vir die omvang van die andersheid van die dowe ontbreek.
- Full Text:
- Authors: Heyns, Mimi
- Date: 1982
- Subjects: Deaf children -- Education -- South Africa , Deaf -- Means of communication , Deaf children -- Language , Deaf children -- Family relationships , Deafness -- Social aspects , Deafness -- Psychological aspects , Sociolinguistics , Sign language acquisition , Deaf -- Government policy -- South Africa , Deaf -- Social conditions -- South Africa , Self-perception , Identity (Psychology)
- Language: Afrikaans
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3284 , http://hdl.handle.net/10962/d1006881 , Deaf children -- Education -- South Africa , Deaf -- Means of communication , Deaf children -- Language , Deaf children -- Family relationships , Deafness -- Social aspects , Deafness -- Psychological aspects , Sociolinguistics , Sign language acquisition , Deaf -- Government policy -- South Africa , Deaf -- Social conditions -- South Africa , Self-perception , Identity (Psychology)
- Description: From Introduction: Gehoor speel 'n belangrike rol in die leerproses, in aanpassing by die omgewing asook in aanpassing by sosiale omstandighede. Gehoorverlies plaas die individu in 'n situasie van vereensaming, veroorsaak deur 'n beperktheid in kommunikasievermoë. (Roux, 1979:1) Dr Roux, Direkteur van Gesondheidsdienste van die Departement van Gesondheid, Welsyn en Pensioene, het tydens die Goue Jubileum-Kongres van die Suid-Afrikaanse Nasionale Raad vir Dowes daarop gewys dat gehoorverlies vandag meer Amerikaners affekteer as hartsiektes, kanker, blindheid, tuberkulose, veneriese siektes, sklerose en niersiektes tesame. (Roux, 1979:1) In Suid-Afrika word beraam dat 0,06% van aIle babas totaal doof gebore word en dat die aantal persone met ernstige gehoorprobleme, volgens die skatting van die Departement van Gesondheid, Welsyn en Pensioene, 65 000 beloop. Hierdie getal sluit Swartes uit. (Roux, 1979:1) ... Die probleem van doofheid is kompleks en soms so ingewikkeld dat dit te betwyfel is of die horende individu die omvang daarvan begryp en insig in die situasie van die dowe kan ontwikkel. Empatie met die dowe en begrip vir sy leefwêreld is vir die horende persoon problematies. 'n Wêreld sonder klank is moeilik om te visualiseer en 'n wêreld sonder taal lê buite die begripsvermoë van die horende. Daar bestaan op velerlei gebiede verwarring ten opsigte van die dowe. Die horende persoon besef gewoonlik dat daar 'n eiesoortige wêreld van ervaring en denke vir die dowe is anders as die van die horende, maar begrip vir die omvang van die andersheid van die dowe ontbreek.
- Full Text:
Die musikale potensiaal van die kleuter en die ontwikkeling van 'n sillabus vir pre-primêre musiekopvoeding met besondere verwysing na die Dalcroze-, Kodaly-, en Orff-metodes
- Authors: Hendrikse, Salomé
- Date: 1982
- Language: Afrikaans
- Type: Thesis , Masters , MMus
- Identifier: vital:2667 , http://hdl.handle.net/10962/d1006147
- Full Text:
- Authors: Hendrikse, Salomé
- Date: 1982
- Language: Afrikaans
- Type: Thesis , Masters , MMus
- Identifier: vital:2667 , http://hdl.handle.net/10962/d1006147
- Full Text:
Evaluation of Tucumania Tapiacola Dyar (Lepidoptera: Phycitidae) for biological control of jointed cactus in South Africa
- Authors: Hoffmann, John Hugh
- Date: 1982
- Subjects: Phycitidae Cactus -- South Africa Weeds -- Biological control -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5634 , http://hdl.handle.net/10962/d1005316
- Description: Jointed cactus, 0puntia aurantiaca Lindley, remains a problem and continues to expand its range in South Africa, in spite of a mandatory herbicidal control. programme. The feasibility of biologically controlling the weed is being explored because the cost of herbicides has escalated and, if it succeeds, biological control is permanent self perpetuating and relatively cheap. This thesis describes the introduction and release in South Africa of the phycitid moth, Tucumania tapiacola Dyar, as a potential biocontrol agent against jointed cactus. A preliminary objective of the study was to resolve the taxonomic confusion within the genus Tucumania, so that the various populations of the moth from widespread localities and from different host plants could be identified. The efficiency of mass-producing T. tapiacola in the insectary was continually improved through investigations of the insects biology, and its response to various environmental parameters. Techniques were developed to manipulate the different life-stages of T. tapiacola so that every release was made with the maximum possible number of individuals, all in the same stage of development. Trials were made with various methods for transporting and releasing T. tapiacola in the field, and the most successful of these were employed during the establishment programme. In all, approximately 830 000 T. tapiacola eggs, larvae and adults have been released at seven localities in South Africa, between May 1977 and February 1982. So far, the moth has failed to establish for more than three to five generations at any release site, for reasons that were not immediately apparent. The mortality factors acting against the immature stages of T. tapiacola have been investigated and quantified. The accumulated data were used to construct partial-life-tables and survivorship curves. These show that survival of the eggs, larvae and pupae differed in shaded and exposed habitats, and on small, medium and large O. aurantiaca plants. The overall mortality suffered by the immature stages alone did not account for the establishment failure. Alternatively, genetic problems that are commonly associated with the collection, mass production and release of biocontrol agents may have been responsible for the failure. Methods of overcoming these problems during future releases are discussed.
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- Authors: Hoffmann, John Hugh
- Date: 1982
- Subjects: Phycitidae Cactus -- South Africa Weeds -- Biological control -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5634 , http://hdl.handle.net/10962/d1005316
- Description: Jointed cactus, 0puntia aurantiaca Lindley, remains a problem and continues to expand its range in South Africa, in spite of a mandatory herbicidal control. programme. The feasibility of biologically controlling the weed is being explored because the cost of herbicides has escalated and, if it succeeds, biological control is permanent self perpetuating and relatively cheap. This thesis describes the introduction and release in South Africa of the phycitid moth, Tucumania tapiacola Dyar, as a potential biocontrol agent against jointed cactus. A preliminary objective of the study was to resolve the taxonomic confusion within the genus Tucumania, so that the various populations of the moth from widespread localities and from different host plants could be identified. The efficiency of mass-producing T. tapiacola in the insectary was continually improved through investigations of the insects biology, and its response to various environmental parameters. Techniques were developed to manipulate the different life-stages of T. tapiacola so that every release was made with the maximum possible number of individuals, all in the same stage of development. Trials were made with various methods for transporting and releasing T. tapiacola in the field, and the most successful of these were employed during the establishment programme. In all, approximately 830 000 T. tapiacola eggs, larvae and adults have been released at seven localities in South Africa, between May 1977 and February 1982. So far, the moth has failed to establish for more than three to five generations at any release site, for reasons that were not immediately apparent. The mortality factors acting against the immature stages of T. tapiacola have been investigated and quantified. The accumulated data were used to construct partial-life-tables and survivorship curves. These show that survival of the eggs, larvae and pupae differed in shaded and exposed habitats, and on small, medium and large O. aurantiaca plants. The overall mortality suffered by the immature stages alone did not account for the establishment failure. Alternatively, genetic problems that are commonly associated with the collection, mass production and release of biocontrol agents may have been responsible for the failure. Methods of overcoming these problems during future releases are discussed.
- Full Text: