Interactions between two biological control agents released on Pereskia aculeata Miller (Cactaceae), in South Africa
- Authors: Mnqeta, Zezethu
- Date: 2017
- Subjects: Pereskia aculeata -- Biological control , Cactus -- Biological control -- South Africa , Alien plants -- Biological control -- South Africa , Flea beetles -- South Africa , Coreidae -- South Africa , Insects as biological pest control agents -- South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/7949 , vital:21327
- Description: Pereskia aculeata Miller (Cactaceae) is an alien invasive plant introduced into South Africa from Brazil, which has negative impacts on native biodiversity in South Africa. Phenrica guerini Bechyne (Chrysomelidae) and Catorhintha schaffneri Brailovsky & Garcia (Coreidae) are two biological control agents released against P. aculeata in South Africa. Phenrica guerini was first released against P. aculeata, in 1991, followed by C. schaffneri in 2014. The overall aim of this study was to improve the biological control programme against P. aculeata in order to decrease its density to a level where it does not threaten the native biodiversity of South Africa. The first part of this study evaluated the efficacy of P. guerini on P. aculeata at Port Alfred (Eastern Cape) to better understand the role of P. guerini in the biological control of P. aculeata. An insecticide exclusion experiment was conducted over 100 days. Plots with P. guerini had a mean of 187 (SE ± 62) fewer leaves/m2 than plots without P. guerini. The agent reduced percentage cover in plots with P. guerini, with a mean of 19.42% (SE ± 3.15) lower cover than plots without P. guerini. Although P. guerini had an impact on P. aculeata at Port Alfred previous studies have indicated that a reduction to below 50% cover is required for native biodiversity to recover and the agent only reduced cover to 62% at Port Alfred. Phenrica guerini has therefore not reduced percentage cover sufficiently to completely control the weed. The data collected from Port Alfred was compared to the performance of the agent nationwide. Although P. guerini was found at far more sites than previously recorded, there were very few sites with comparable levels of damage to Port Alfred. This evidence suggests that P. guerini is not sufficiently damaging to reduce P. aculeata to acceptable levels and other biological control agents should be considered.Interactions between two biological control agents can have complex and unexpected impacts for a biological control programme. The second part of this study was to investigate interactions between C. schaffneri and P. guerini under laboratory conditions to test whether the two agents, individually or jointly, enhanced or reduced their impact on P. aculeata. Potted P. aculeata plants were exposed to one of four treatments: control (no agents), P. guerini only, C. schaffneri only and both species in combination. Four stocking densities, ranging from 2 to 12 insects per plant were used. Catorhintha schaffneri alone at high densities was more damaging than all other treatments with a significantly greater reduction in the mean number of leaves, 11.7 (SE ± 1.29), and shoot lengths, 2.17cm (SE ± O. 75). Even at lower density treatments, the combination of the two agents was not significantly more damaging than C. schaffneri alone and C. schaffneri was always more damaging than P. guerini alone. Mortality of P. guerini was significantly higher than C. schaffneri at the highest stocking density when in combination. Phenrica guerini contributes towards the biological control of P. aculeata at some sites in South Africa but not enough to completely control the weed. The antagonistic interaction between P. guerini and C. schaffneri suggests that these agents should not be released together because this would impact negatively on the overall biocontrol programme against P. aculeata. Catorhintha schaffneri should be released at sites were P. guerini is not present and evaluations of the success of this agent in the field should be conducted. Extrapolation of laboratory-based studies into the field is often challenging so mass-rearing of P. guerini should continue until there is convincing proof that C. schaffneri alone is more effective than P. guerini in the field.
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Intergenerational learning and environmental care: a case of a fishing community next to Africa’s first marine protected area
- Authors: Cloete, Cindy-Lee
- Date: 2017
- Subjects: Tsitsikamma Marine Protected Area (South Africa) , Covie (South Africa) , Intergenerational relations -- South Africa -- Covie , Intergenerational communication -- South Africa -- Covie , Fishing villages -- South Africa -- Covie , Sustainable fisheries -- South Africa -- Covie , Environmental education -- South Africa -- Covie
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/7598 , vital:21277
- Description: This study explored the relationship between intergenerational learning and environmental care in the small fishing community of Covie, located next to the Tsitsikamma Marine Protected Area (TMPA) on the south-eastern coast of South Africa. Since Covie’s establishment as a woodcutter settlement in 1883, the community has depended on the marine and coastal environment such that their communal identity and basic means of subsistence are closely tied to their traditional fishing practices. Since its proclamation in 1964, the TMPA has undergone numerous policy changes, most notably the complete closure of the TMPA to fishing in 2001. Against this backdrop, the study sought to understand how intergenerational learning about fishing practices are mediated in Covie and the ways in which such learning processes constitute a sense of place and belonging for the Covie fishers, and to develop a sense of care for the natural environment. The study included 12 Covie community members of different generations and genders so as to be representative of the community (approximately 86 members). The research was informed by qualitative data generated through a focus group discussion with eight Covie community members, a mirror workshop with the same eight community members, eight semi-structured interviews, and five naturalistic observations of fishing practices. Data generation and analysis was informed by Etienne Wenger’s theory of Communities of Practice which was complemented by theoretical perspectives on intergenerational learning and attachment to place. This study found that the Covie fishers indeed operate as a community of practice who depend significantly on intergenerational learning processes to transfer knowledge, skills and values about fishing practices to younger generations. The 2001 policy changes that denied the Covie fishers access to their traditional fishing sites were shown to reduce the participation in fishing of a range of community members (in particular children and women), which in turn influenced forms of intergenerational learning about fishing. The youth’s reduced participation especially was linked to more protracted and fragmented processes of learning about fishing and Covie’s code of fishing conduct, including its underpinning sense of environmental care. Finally, this study argues that the affective and socio-material connections to their natural surroundings have shaped the Covie community’s sense of care and responsibility toward the environment.
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Invasion status and potential impacts of bluegill Lepomis macrochirus Rafinesque, 1819 in the Kariega River, Eastern Cape, South Africa
- Authors: Ndaleni, Phumza Malibongwe
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/7586 , vital:21276
- Description: The impact of alien invasive species is one of the greatest threats to biodiversity globally. All of the major drainages of South Africa are invaded by non-native fishes, yet little information is available on their impact. This thesis focusses on providing a better understanding of the potential impacts of bluegill Lepomis macrochirus Rafinesque, 1819, a species introduced into South Africa from the USA in 1938. The study assesses the distribution, establishment success and feeding ecology of L. macrochirus in an invaded South African River system in order to better understand and document its potential impacts. Specifically; this thesis (1) assesses the distribution and relative abundance of L. macrochirus in the Kariega System of the Eastern Cape, (2) determines the diet of the species in one of the major impoundments of the system, and (3) uses an experimental comparative functional response approach to assess whether this species has heightened predatory capabilities when compared with fishes with which it cooccurs. Ninety-six sites in the Kariega River system were sampled from the headwaters down to the estuary. Small native fish species (Enteromius anoplus and Enteromius pallidus) occurred mostly in the upper reaches, while in the middle and lower reaches, the centrarchid alien largemouth bass Micropterus salmoides and bluegill L. mocrochirus dominated. There was overlap between the centrarchids and introduced banded tilapia Tilapia sparrmanii and southern mouthbrooder Pseudocrenilabrus philander, but never with small-bodied native species. The stomach contents of L. macrochirus were examined during winter and summer and prey were identified to family level. Crustaceans and insects were an important component in their diet, but in summer fish eggs were common. Comparisons of bluegill diet with published literature indicated that there was potential for competition with largemouth bass, banded tilapia and southern mouthbrooder. Feeding experiments were conducted to compare the functional responses of these four species using a common prey item. Banded tilapia had significantly lower attack rates than the other species with no significant difference observed in other species. Bluegill has a similar impact to that of banded tilapia and southern mouthbrooder, but lower than that of largemouth bass. Results of the present study highlight that L. macrochirus introduced into dams will likely result in both upstream and downstream invasion of river systems. It is likely that this species does not, however, have as much of a predatory impact as M. salmoides in that its predatory capacity is relatively reduced and more comparable to South African native cichlids. These results are discussed within the context of invasion success/failure in other regions of southern Africa.
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Invasive alien plants and rural livelihoods: a case of Gwanda District, Zimbabwe
- Authors: Dube, Nqobizitha
- Date: 2017
- Subjects: Cylindropuntia fulgida , Invasive plants -- Economic aspects , Invasive plants -- Control , Invasive plants -- Economic aspects -- Zimbabwe , Ecosystem services -- Zimbabwe , Environmental policy -- Zimbabwe , Ecosystem management -- Zimbabwe , Cactus -- Economic aspects -- Zimbabwe
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/4368 , vital:20653
- Description: Biodiversity is the cornerstone of ecosystem functioning and the realisation that most rural African community livelihoods are directly dependent on ecosystem goods and services warrants its conservation. Invasive alien plants threaten biodiversity and compromise the ecosystem's ability to provide goods and services for rural communities, thereby negatively affecting livelihood strategies. Information on IAPs is lacking in most African countries, thus, the livelihood effects of Invasive Alien Plants (IAPs) are not clearly understood. In Zimbabwe, Cylindropuntia fulgida var. fulgida (Cff) has invaded Gwanda district in the Matabeleland south province compromising local household capital assets that contribute to livelihood strategies and altering the ecosystem. This study exposed the rural worldview of the environment, the effect that Cff has on local livelihood strategies and the effectiveness environmental management institutions in rural Gwanda district. The study followed a post positivist paradigm. The impacts of IAPs on rural communities in Zimbabwe were analysed by looking at the livelihood stresses that arise because of Cff. The research used multi-stage sampling to select a representative sample of respondents. Primary data was collected using semi-structured questionnaires, group discussion and key informant guides. Furthermore, document analysis was conducted to collect secondary data. The data analysis process used Computer packages Microsoft Excel, SPSS and NVIVO. Results showed that livelihood benefits that species in the natural environment provide strongly influence environmental perceptions of rural African communities. Additionally, the study showed that Cff compromises the local ecosystem and reduces its ability to support the dominant livelihoods in the study area. The long-term result of such a situation in the absence of control is increased poverty and the failure to realise sustainable development. However, results indicated that IAPs could also improve the poverty situation of a community before they have reached the threshold points. It is therefore imperative to know the threshold points of an invasive plant in order to ascertain the efficient point to intervene. The study also showed that benefits of invasive plants accrue to different members of a society at different times (private/public). This knowledge allows the adoption of efficient and effective control strategies.
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Investigating herbivory and plant origin on tall-statured grasses in South Africa
- Authors: Canavan, Kim N
- Date: 2017
- Subjects: Insects as biological pest control agents -- South Africa , Arundo donax , Giant reed -- South Africa , Giant reed -- Biological control -- South Africa , Phragmites australis , Phragmites mauritianus , Phragmites , Tetramesa romana , Biological invasions -- South Africa , Wasps -- Host plants , Wasps -- South Africa
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/6147 , vital:21051
- Description: South African riparian zones have been heavily degraded through anthropogenic activities such as dam construction and extraction of water for irrigation, which has resulted in a loss of ecosystem services and functioning. A consequence of such disturbances to riparian areas is in their susceptibility to invasive alien species (IAS). One such IAS is the giant reed, Arundo donax L. (Poaceae), introduced to South Africa in the 1700s largely for erosion control. Arundo donax has since greatly expanded in the country and is now one of the most abundant IAS. Arundo donax has been found to displace native vegetation and in South Africa this will most likely lead to the displacement of the native tall-statured grasses, Phragmites australis (Cav.) Trin. ex Steud. and Phragmites mauritianus Kunth. This study aimed to enhance our understanding of the tall-statured grasses A. donax, P. australis and P. mauritianus to better manage them in riparian areas. For A. donax, biological control is seen as the most viable option to control stands in the long-term. However, before such a programme is put in place, it is important to first collect baseline data that can be used to guide the direction of the biological control project in South Africa. For the Phragmites spp., despite being a dominant vegetative type in riparian areas, very little is known about their status in South Africa. Furthermore, there have been increasing reports of both Phragmites species having an expansion of their range and abundance. In North America, there has been a similar trend of reed expansion and through molecular work it was determined that a cryptic invasion has occurred with the introduction of an invasive non-native haplotype from Europe. It is therefore unknown if Phragmites spp. populations are expanding due to anthropogenic activities or due to a cryptic invasion. To address these shortfalls in knowledge the study investigated the tall-statured grasses in two parts; firstly, molecular techniques are used to explore the plant origin and genetic diversity of A. donax, P. australis and P. mauritianus and secondly using the Enemy Release Hypothesis as a framework, herbivore assemblages for each reed was determined across their distribution in South Africa. Molecular-techniques determined that both P. australis and P. mauritianus had only one haplotype - known as haplotype K and haplotype V respectively, across their distribution. For P. australis, haplotype K shares a close connection with populations from a Mediterranean lineage and this was further confirmed with a shared grass-waxy band. The direction and timing of genetic exchange between the two regions could not be ascertained and thus still remains unknown. Microsatellite analysis determined that both Phragmites spp. had a high genetic diversity compared to worldwide lineages. With no evidence of any cryptic invasions of haplotypes from other regions, both Phragmites spp. populations are likely to be native to South Africa. For A. donax all populations across South Africa were determined to be haplotype M1; a cosmopolitan haplotype that has an ancient native range in Afghanistan and Pakistan (Indus Valley). Populations were found to have no genetic diversity and thus can be considered one clone. A pre-introductory survey determined a list of herbivores associated with each tall- statured grass. For A. donax, a total of seven herbivores were found. Of these, one herbivore, a galling wasp, Tetramesa romana Walker (Hymenoptera: Eurytomidae) was found to be highly abundant and widely distributed in South Africa. Tetramesa romana is already a biological control agent in North America and thus is likely exerting some pressure on A. donax populations in South Africa. For both Phragmites spp. a total of ten herbivores were found, although having higher species richness compared to A. donax, when compared to other regions, these native species have a relatively low species richness. Providing baseline data on plant origin, genetic diversity and herbivory on A. donax, P. australis and P. mauritianus has provided important information on managing these species in riparian ecosystems in South Africa. For the Phragmites spp. with no evidence of any cryptic invasions, it is recommended that reed stands continue to be managed as native species. Phragmites spp. are important dominant vegetative species and thus should be protected; however, if reed stands become expansive, control methods can be put in place to focus on managing spread and abundance. For A. donax, this study was able to provide pivotal information in guiding the biological control programme. By determining the ancient lineage of South African populations, research can be focused in this area to find potential biological control agents. Lastly, the pre-introductory survey determined that a biological control agent, T. romana was already established with an unknown introduction and also highlighted potential plant parts that should be targeted. In particular, no rhizome feeding herbivores were found in South Africa and therefore this highlights an important niche that should be explored in biological control agents.
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Investigating how Grade 10 Physical Science teachers help learners to make sense of concepts of electromagnetism using easily accessible materials in under-resourced schools
- Authors: Samuel, Paulo
- Date: 2017
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/8143 , vital:21359
- Description: This study sought to explore teachers’ perceptions and experiences of using easily accessible materials and how they might collaboratively develop learning and teaching support materials using easily accessible materials. The study explored three aspects. Firstly, the views, experiences and factors which influence grade 10 Physical Science teachers’ perceptions and experiences of teaching the topic of electromagnetism. Secondly, to find out what teachers can do to improve teaching and learning of electromagnetism in grade 10 Physical Science using easily accessible materials. Thirdly, to look at what enables or constrains grade 10 Physical Science teachers in under-resourced schools when dealing with electromagnetism, from using easily accessible materials. A qualitative method approach was adopted, underpinned by an interpretive paradigm but using some quantitative methods as well. Within the interpretive paradigm a case study approach was used. The study was carried out in Swakopmund and Gobabis education circuits of the Erongo and Omaheke Regions respectively. Data were collected using questionnaires, lesson observations and stimulated-recall interviews. The data obtained were validated in two ways, firstly, by triangulation from different data gathering techniques, and secondly, validation was done by member checking of the transcripts. To make meaning from the data generated, Vygotsky’s (1978) socio-cultural theory was used as a lens to analyse the data. The quantitative data generated were presented in figures, tables; whereas the qualitative data were coded inductively into descriptive texts to make meaning. It was found that teachers’s perceptions and experiences are that the topic of electromagnetism is quite challenging. Teachers reported that their learners find it difficult to comprehend phenomena associated with electromagnetism, thus making it difficult for their learners to grasp concepts associated with it. Lack of resources to do practical activities in the topic of electromagnetism was found to be a major contributing factor to teaching and learning of this topic. The use of easily accessible materials among teachers was found to be very limited. Easily accessible locally sourced materials were found to have the potential to enable grade 10 Physical Science teachers to help learners to make sense of concepts of electromagnetism in under-resourced schools. In light of the above findings, the study recommends that science teachers should make use of easily accessible materials which can minimise their dependence on standard laboratory equipment which is unaffordable anyway by most schools.
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Investigating teachers’ pedagogic practices of argumentative essay: a qualitative case study of two Grade 11 classrooms in the Oshikoto Region, Namibia
- Authors: Kanyama, Victoria Magano
- Date: 2017
- Subjects: Persuasion (Rhetoric) -- Study and teaching (Secondary) -- Namibia , English language -- Rhetoric -- Study and teaching (Secondary) -- Namibia , English language -- Writing -- Study and teaching (Secondary) -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/8132 , vital:21358
- Description: Argumentative writing in Namibian schools has been a challenge over the years as Grade 11-12 English Second Language (ESL) learners perform poorly when compared to other writing that is stipulated in the curriculum. In most instances learners do not satisfy the structural and rhetorical features of this genre. English teachers are, therefore, expected to ensure that argumentative writing is adequately developed in order for the learners’ writing to be up to the required standard. Studies carried out in Namibia by Nghikembua (2013) and Nyathi (2009) indicated that learners perform poorly in writing. The examiners’ reports of 2011-2014 pointed to lack of teachers’ guidance as one of the factors contributing to poor performance. It was for this reason that this study aimed to investigate teachers’ pedagogic approaches when teaching argumentative essay both on Higher and Ordinary Level in Oshikoto region, Namibia. An interpretive qualitative case study was used in order to gain an in-depth understanding of the teachers’ pedagogic approaches and how it affects their learners’ argumentative essay writing. The theoretical framework was informed by the Genre theorist, Gibbons (2002), who focuses on the Curriculum Cycle and Hyland’s (1990) model. Two Grade 11 English teachers were purposefully and conveniently sampled. One of the teachers is from a government school while the other from a private school. Data were collected from interviews, videoed writing lessons (3 per teacher), and learners’ written essays. Data analysis revealed that both teachers have a sound understanding about argumentative writing, but their classroom practices did not sufficiently assist the learners to grasp the argumentative writing conventions. Their classroom practices were not adaptive enough when giving feedback to the learners, and they did not adhere to the four steps of Gibbons’ (2002) Curriculum Cycle. Also, the process to writing (brainstorming, drafting, and revising) was also not incorporated into their teaching. These meant that the Namibian curriculum specifications are not met which deprives the learners of the needed practice scaffolding and explicit teaching into competent independent writers. A recommendation of this study is that there is a need for the teachers to be exposed to a mixed process/genre approach as advocated by the Namibian curriculum.
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Investigating the interplay between Grade 9 learners’ home visual literacy and their development of school visual literacy in English First Additional language classrooms
- Authors: Mnyanda, Lutho
- Date: 2017
- Subjects: Visual literacy , Digital literacy , Action theory , Culturally relevant pedagogy , English language -- Study and teaching -- Foreign speakers -- Case studies , English language -- Study and teaching -- Foreign speakers -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/50191 , vital:25966
- Description: Visual literacy is one of the critical aspects that English First Additional Language teachers and learners battle with. The focus of this investigation was on developing learners’ performance in visual literacy and helping teachers improve teaching practice. This thesis reports on efforts in developing critical visual literacy in two Grade 9 classrooms; a rural and a township school in the King William’s Town District in the Eastern Cape. The research spread over four week, spending two weeks at each school as an ethnographic researcher, being assimilated to the culture of the each school. In understanding the kind of visual knowledge that these learners brought from home between the rural-urban divide, the learners displayed an interest in visual literacy, used the necessary language and appeared to design certain visual materials around the school. Data was collected in the form of questionnaires that learners filled, informal Facebook conversation screenshots, as well as the researcher’s field notes. Learner focus group discussions were conducted, tape recorded and transcribed. Two lessons each were observed with the two teachers, and these were recorded and transcribed. A camera was used to take shots in the classroom to show the interaction between the teachers and the learners. Also, semi-structured interviews were held with each teacher and these were recorded and transcribed. The data revealed that there were no major differences between rural and urban school learners. However, the research has provided a valuable insight into the mismatch between home visual literacy practices and school visual literacy teaching. The learners’ digital visual literacy practices were far ahead than those of the teachers who are not able to capitalise on these visual skills; the cultural capital that learners bring to school. Learners also displayed a low reading culture but the medium for reading has shifted considerably and learners developed communication skills through digital technology. Teacher agency in the classroom revealed that teachers need to first engage with the cognitive functions of the visual images that they teach by the prevalence of low level questions that they ask. Moreover, there is a place for translanguaging in visual literacy lessons. These indicate important areas for teacher development to promote the emergence of transformative agency.
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Investigating the use of models to develop Grade 8 learners’ conceptual understanding of and procedural fluency with fractions
- Authors: Albin, Simon
- Date: 2017
- Subjects: Fractions -- Study and teaching (Secondary) -- Namibia , Mathematics -- Study and teaching (Secondary) -- Namibia , Information visualization , Visual learning -- Case studies
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/36288 , vital:24537
- Description: Both my teaching experience and literature of this research study strongly suggested that fractions are difficult to teach and learn across the globe generally, and Namibia in particular. One of the identified contributing factors was teaching fractions by focusing on procedures and not the conceptual understanding. Therefore, this research project developed and implemented an intervention in order to experiment and suggest an alternative teaching approach of fractions using models. The purpose of this research was to: “Investigate the use of models to develop Grade 8 learners’ conceptual understanding of and procedural fluency with fractions”. This investigation had three areas of focus. Firstly, the study investigated the nature of learners’ conceptual understanding of and procedural fluency with fractions before the teaching intervention, by means of administering a pre-test and pre-interview and analysing learners’ responses. Secondly, the study investigated the changes in learners’ conceptual understanding of and procedural fluency with fractions after the teaching intervention, by means of administering a post-test, post-interviews and recall interviews, and analysing learners’ responses. Thirdly, this study investigated the possible influence of the teaching intervention on the changes in learners’ conceptual understanding of and procedural fluency with fractions by analysing the lesson videos and learners’ worksheets, and describe their critical interaction. This study was conducted at a multicultural urban secondary school located in the Oshikoto Region, Namibia. The sample consisted of 12 Grade 8 mathematics learners whose age ranged from 13-16 years old. A purposive sampling method was employed to select both the research site and participants. This research is framed as a case study, and is grounded within the interpretive paradigm and qualitative research. This research revealed that these learners displayed conceptual and procedural difficulties in their engagement with fraction models and fraction symbols, before the teaching intervention. Conceptually, the study found that these learners read fractions using inappropriate names; and learners did not identify the whole unit in the models and therefore identified fractions represented by the fraction models using different forms of inappropriate fraction symbols. Procedurally, the study found that these learners compared and ordered fractions inappropriately using the sizes of the numerators and denominators separately; and learners used the lowest common denominator method inappropriately for adding fractions with different denominators. The research also suggested conceptual and procedural changes in learners’ conceptual understanding of and procedural fluency with fractions and that the intervention seemed to help learners to engage better with fraction models and fraction symbols. Conceptually, the findings suggested that the intervention using area models and number lines, seemed to help these learners to read fractions using appropriate names; to identify the whole unit in the fraction models and to develop a sense of the size of fractions in relation to one whole unit. Procedurally, the learners compared and ordered fractions appropriately using either equal fraction bars, equal number lines, benchmarking or rules for comparing and ordering fractions with the same numerator or denominator; and learners used equal fraction bars to visually represent the lowest common denominator method and to recognise that only equally sized units can be counted together. This research identified four factors as possible influences of the teaching intervention. These factors are namely: identifying both fraction symbols and appropriate fraction names to see fractions as relational numbers; prompting to partition whole units of the fraction models and graphically illustrating fraction symbols to identify the whole unit in the fraction models and to develop a sense of the size of fractions in relation to one whole unit; graphically illustrating fraction symbols using the models to use equal fraction bars and number lines, benchmarking and rules for comparing; and graphically illustrating fraction denominations using equal fraction bars to recognise that only equally sized units can be counted together. This research strongly suggests that the effective use of models has the potential to develop learners’ conceptual understanding of and procedural fluency with fractions in a number of ways.
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Investigation of the potency of topical corticosteroids using the vasoconstrictor assay
- Authors: Zvidzayi, Kudzayi Michael
- Date: 2017
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65279 , vital:28717
- Description: Expected release date-May 2019
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Ionospheric disturbances during magnetic storms at SANAE
- Authors: Hiyadutuje, Alicreance
- Date: 2017
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54956 , vital:26639
- Description: The coronal mass ejections (CMEs) and solar flares associated with extreme solar activity may strike the Earth's magnetosphere and give rise to geomagnetic storms. During geomagnetic storms, the polar plasma dynamics may influence the middle and low-latitude ionosphere via travelling ionospheric disturbances (TIDs). These are wave-like electron density disturbances caused by atmospheric gravity waves propagating in the ionosphere. TIDs focus and defocus SuperDARN signals producing a characteristic pattern of ground backscattered power (Samson et al., 1989). Geomagnetic storms may cause a decrease of total electron content (TEC), i.e. a negative storm effect, or/and an increase of TEC, i.e. a positive storm effect. The aim of this project was to investigate the ionospheric response to strong storms (Dst < -100 nT) between 2011 and 2015, using TEC and scintillation measurements derived from GPS receivers as well as SuperDARN power, Doppler velocity and convection maps. In this study the ionosphere's response to geomagnetic storms is determined by the magnitude and time of occurrence of the geomagnetic storm. The ionospheric TEC results of this study show that most of the storm effects observed were a combination of both negative and positive per storm per station (77.8%), and only 8.9% and 13.3% of effects on TEC were negative and positive respectively. The highest number of storm effects occurred in autumn (36.4%), while 31.6%, 28.4% and 3.6% occurred in winter, spring and summer respectively. During the storms studied, 71.4% had phase scintillation in the range of 0.7 - 1 radians, and only 14.3% of the storms had amplitude scintillations near 0.4. The storms studied at SANAE station generated TIDs with periods of less than an hour and amplitudes in the range 0.2 - 5 TECU. These TIDs were found to originate from the high-velocity plasma flows, some of which are visible in SuperDARN convection maps. Early studies concluded that likely sources of these disturbances correspond to ionospheric current surges (Bristow et al., 1994) in the dayside auroral zone (Huang et al., 1998).
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Jah Hills
- Authors: Slasha, Unathi
- Date: 2017
- Language: English , Xhosa
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7157 , vital:21222
- Description: Jah Hills is alone in Kwaf Indoda bush, waiting for elders to come, burn ibhuma and deliver him home. Two weeks before he departs from his initiation period, he is seduced by igqwirha. When he fails to satisfy her appetite, he gets ‘abducted and turned into isithunzela. One night, he narrowly escapes and finds his way back. But the experience at home is gruesome; they drive him away and want his death. My novel is fast paced, accumulating speed as it proceeds. It is formally experimental, drawing on forms that have gone before and trying to usher in a new manner of writing and looking at the world. It is told through the eyes of isithunzela that Jah Hills has become. It makes use of Nguni folklore, reimagined and subverted so it fits the character’s unearthly vision. Certain characters and moments from Nguni folktales are borrowed and appear throughout the text. Stylistically I draw extensively from the work of Sony Lab’ou Tansi, Taban Lo Liyong, Dambudzo Marechera, D.O. Fagunwa and Amos Tutuola.
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Land reform and rural livelihoods of evicted farm workers: a case study of Radway Green Farm Project
- Authors: Zishiri, Kudzanai
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/44377 , vital:25402
- Description: The land issue has remained a contentious one more than two decades into a democratic South Africa. With the dispossession of the indigenous people from their land stretching back as far as 1913, eviction of farm workers and farm dwellers has increased tremendously even in the post-Apartheid era. Thus, the main goal of this study is to analyse the impact of the eviction on the Radway Green farm workers’ community and to examine the factors affecting the generation of livelihood activities in their new settlement. In doing so, I used the Sustainable Rural Livelihoods Approach (SRLA) as my theoretical framework as it conceptually grounds my area of study. It was employed to analyse data gathered from the field through in-depth interviews, focus groups, key informant interviews and descriptive observation of the case study. The centrality of the SRLA concept is on rural development, poverty eradication and the ability or sustainability of the vulnerable and poor to cope with stresses and shocks as they make a living (Scoones, 1998: 5). In that regard, the theoretical framework became an important cornerstone in analysing the impact of eviction of the Radway Green farm workers’ community and examining the factors affecting the generation of livelihoods activities in their new settlement. To analyse the research findings, various themes were utilised Forced Evictions and Resettlement; Eviction or Displacement; The Struggles of Recreating Livelihoods; The Need for Security of Land Tenure and Access to Infrastructure. Under these themes, the study revealed how the eviction was detrimental to the livelihoods of the farm workers and farm dwellers as they lost the land that was a primary source for the construction of their livelihoods. They lost employment, homes, agricultural land for food security and natural resources, social and family structures and most importantly cultural disruption. It is well documented that the rural poor who constitute the farm workers and the farm dwellers are some of the vulnerable people who need constant governmental support through the promulgation of laws that protect them and assist in livelihood construction. Thus, this study also served to examine how the evicted workers and their families have settled into their new homes and how they, in conjunction with the Department of Rural Development and Land Reform and any other government agencies are faring in terms of the establishment of income generating projects for their livelihoods at the new settlement.
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Land, Church, Forced Removals and Community on Klipfontein Farm in the District of Alexandria, Eastern Cape c. 1872 - 1979
- Authors: Bezuidenhout, GJW
- Date: 2017
- Subjects: Janse van Rensburg family , Klipfontein Farm (Alexandria, South Africa) , Alexandria (South Africa) -- History , Colored people (South Africa) -- History , Colored people (South Africa) -- Religion , Colored people (South Africa) -- Relocation , Black people -- Relocation -- South Africa -- Eastern Cape , Family farms -- South Africa -- Eastern Cape , Church history -- South Africa -- Eastern Cape , Land tenure -- Law and legilstion -- South Africa , Land reform -- Law and legislation -- South Africa
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/161315 , vital:40615
- Description: This thesis is a case study of how church, land and dispossession of land has influenced identity formation of a coloured community in the Eastern Province, namely the Klipfontein community. Coloured history in the Eastern Province has largely been neglected. This study attempts to rectify such a lack of in-depth enquiry as it may lead to misinterpretations that may influence contemporary politics and identity formation. Through research based on primary sources, it is evident that the social landscape of Klipfontein Farm and the relationships between that community and surrounding black African and white communities have largely been shaped by the stipulations contained in the joint will of the community’s ancestors: Dirk and Sarah Janse van Rensburg. The land devolved into a trust and has been administered by trustees since the death of the first spouse in 1877. By keeping the land in a trust, it enabled the descendants to continue to live on the farm in perpetuity, without the risk of being forced off the land via financial restraints or racially-based legislation. But the usufructuaries could also never fully utilise Klipfontein as an agricultural concern due to a combination of a lack of equipment and skill, and the provisions of the will. These complications inevitably led to inter-familial disputes and tension. Before 1939 there had already been three court cases dealing with the interpretations of the Will. In that same year the Supreme Court ordered that tracts of the land, including a part of Boesmansriviermond village, be sold in order to pay off arrear rates and taxes. Although the responsibility for these sales lay with the trustees, the community has been suspicious of the usufructuaries ever since. A key element of the Klipfontein identity is their religion. The church legitimises their right to the farm - against those who wish to take that right away. Their claim to occupation is couched in scriptural discourse, viewing Klipfontein as 'their Garden of Eden' that God gave to the stamvader, Dirk Janse van Rensburg. This seemed to have been partially successful for the Klipfontein community in staving off harassment by authorities. It also caused friction between the community and the black African residents. Some usufructuaries and family members felt that such right was exclusively given to the coloured community and so they became increasingly annoyed by the black Africans who settled there. Other usufructuaries did not share this feeling. They allowed evicted black African farm labourers to settle on certain portions of Klipfontein until the late 1970s. The black African population rapidly increased due to misinformation and evictions from neighbouring farms. This only further exacerbated the inter-familial conflict between usufructuaries, flaring tensions between the black Africans and their reluctant hosts as well as animosity from the white community towards Klipfontein. In 1979, after a series of court cases, a decision was made to remove all the African settlers by force and relocate most of them to the ‘homeland’ of Ciskei. The rest, who were of ‘working-age’ were left behind in a ‘temporary emergency camp’ on the outskirts of Kenton-on-Sea. The effects of these removals still impact the relationships between the different racial groups in the area to this day.
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Language and access in the public healthcare system in South Africa with a particular focus on primary public health facilities in Grahamstown and Cofimvaba in the Eastern Cape
- Authors: Mhlauli, Nonceba
- Date: 2017
- Subjects: Health literacy -- South Africa -- Eastern Cape , Patient education -- South Africa -- Eastern Cape , Communication in medicine -- South Africa -- Eastern Cape , Health literacy -- Social aspects -- South Africa -- Eastern Cape , Poor -- Medical care -- South Africa -- Eastern Cape
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/56692 , vital:26817
- Description: The right to language and the right to healthcare services are human rights which are enshrined in the Constitution of the Republic of South Africa. Section 6 (5) of the Constitution and Section 1.3 (b) and (e) of the Eastern Cape Provincial Language Policy provide protection against unfair discrimination on the grounds of language; while sections 30 and 31 (1) of the Constitution refer to people’s rights in terms of cultural, religious and linguistic participation. Section 27 (a) states that ‘everyone has the right to access to healthcare services’. In accordance with the Constitution, in 2011 the National Department of Health passed a Policy on Language Services. This policy aims to facilitate equitable access to government services and information, as well as respect for language rights as spelled out in the Constitution. The Policy on Language Services further aims to promote multilingualism in the National Department of Health and to allow people to access information in a language of their choice, understand important messages and the language necessary for informed and participatory decision making (Department of Health 2011:1). Given the above policy and Constitutional provisions as far as policy commitment is concerned, the crucial issue remains the implementation of such policy to ensure that the right to access to health and language are realised. The study provides an analysis of the Policy on Language Services 2011 as it relates to language rights and the delivery of health services, focusing on the roll out and implementation process and the public awareness of the policy. This study primarily focuses on the role language plays in accessing public healthcare in primary healthcare facilities in the Grahamstown and Cofimvaba. The study looked at communication between patient and healthcare providers and whether healthcare services were provided in the language of the patient or the language the patient knows best. This study further assessed indications of patients’ comprehension of information such as medical instructions on packaged medicine, comprehension of posters, pamphlets and health education sessions in order to fully participate in the process of their health status. The data of this research was collected from healthcare providers and patients in primary healthcare facilities in Grahamstown and Cofimvaba in the Eastern Cape. The research methods used was in-depth interviews, non-participant observations as well as content analysis such as sign/direction posts, medical labels and information boards. These methods were used to determine whether language plays a role in accessing quality healthcare services in these facilities. The research found that the lack of implementation of language and health policy resulted in the perpetuation of language barriers in the healthcare sector. The study therefore argues that adequate healthcare can only be provided if and when healthcare providers and patients are able to communicate with each other in the language they know best or feel most comfortable in. Thus meaning the implementation of the current Constitutional and policy provisions is crucial to language and access to healthcare services.
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Language and literacy development for a Grade 10 English first additional language classroom: a reading to learn case study
- Authors: Mataka, Tawanda Wallace
- Date: 2017
- Subjects: English language -- Study and teching (Secondary) -- South Africa Reading -- Study and teching (Secondary) -- South Africa Literacy -- Study and teching (Secondary) -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/249 , vital:19941
- Description: The problem of poor reading skills is a serious one in South Africa, with negative implications for learners’ educational achievement. The failure of learners to read at age- and grade-appropriate levels presents a major challenge to the teaching of reading in South African schools. It is against this background that this study aimed at ascertaining the positive impact of the Reading to Learn methodology in improving the literacy levels of learners in a Grade 10 English First Additional Language classroom in a township school. Reading ability levels were established via a passage extracted from a Grade Platinum English First Additional Learner’s book. Pronunciation and word recognition formed the basis of the reading assessment. Reading translates into writing, so the learners were also assessed in comprehension and creative writing. The results indicated that the learners’ reading abilities were weak, the methodology used to teach reading led to research findings that caused the study to yield findings that suggest that RtL may be the solution to reading problems in the classroom. In addition the study revealed that the ability to read corresponds with cognitive development. The study therefore calls for the adoption of RtL to assist in alleviating reading problems in the classroom.
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Leadership development in a Representative Council of Learners (RCL) in a secondary school in the Eastern Cape
- Authors: Strydom, Monica Petro
- Date: 2017
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/43054 , vital:25261
- Description: The purpose of this study was to answer two main research questions: How is leadership promoted on a Representative Council of Learners (RCL) and What leadership roles do learners on the council play in schools? Recent research suggests that although the democratisation of school governance has given all stakeholders a voice in how schools are being governed, it seems that learner voice is still largely silenced. Literature on this issue paints an uninspiring picture of learner under-involvement and marginalisation. In seeking underlying causes for this, this study is informed by notions of leadership for social justice. The study investigated the RCL at a public, fee-paying school in the Makana district of the Eastern Cape. By observing the daily functioning of the council, engaging with the learner leaders as well as teachers, parents and other role players, I developed a better understanding of the challenges the RCL faced as well as factors which promoted their role as learner leaders. This aided in answering the first key research question of how the RCL promotes leadership development. To answer the second key question, I needed to consider the perceptions of stakeholders concerned and how they saw the operation of the RCL. This study is situated in the interpretive research tradition and uses critical realism as its under-labourer. To support this study and to answer some of the aims of this research, Leontiev’s second generation Cultural Historical Activity Theory was used. Data were collected through semi-structured interviews, questionnaires an observation and document analysis. Data analysis took the form of identifying themes which emerged from the data. These formed the basis of my discussion and I was thus able to address the main research questions. Data revealed that learner leaders in schools are mainly managers and not really leaders; that learners are still very much marginalised as leaders and that they subsequently do not have a lot of say when it comes to how their schools are governed. It further emerged that despite formal legislation and guidelines which are in place to allow for the democratic rights of learners’ opinions to be heard in schools, historical and cultural forces account for parents and other role players’reluctance to allow learners to have too much of a say. I trust that the findings from this research will strengthen learner leadership structures in schools and perhaps provide guidelines on how learner leadership could be developed and managed.
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Linking livelihood and ecosystem change in two dryland sites in Southern Africa over a period of 30 years
- Authors: Masunungure, Current
- Date: 2017
- Subjects: Marwendo Village (Zimbabwe) -- Social conditions , Tshivhulani Village (South Africa) -- Social conditions , Marwendo Village (Zimbabwe) -- Environmental conditions , Tshivhulani Village (South Africa) -- Environmental conditions , Climatic changes -- South Africa -- Tshivhulani Village , Climatic changes -- Zimbabwe -- Marwendo Village
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4819 , vital:20732
- Description: The ongoing and rapid change (from global to local level) in climate, populations, governments, cultures, environment, land use and economies are critical issues, especially for poor rural communities found in the dryland parts of southern Africa. The manifestations of change can combine to increase rural livelihood vulnerability, through the erosion of assets and insecurity, but can at the same time create new opportunities. Studies that consider the complex nature of change across scales and how it affects changes in livelihoods, ecosystems and responses at local level, are increasingly needed. This study, carried out in two purposefully selected study sites in the communal drylands of south-eastern Zimbabwe (Marwendo village) and Limpopo province in South Africa (Tshivhulani village), examined the complex nature of change across scales by assessing the way in which change at the global scale results in localised trends, shocks and stressors, and its impacts on livelihoods and ecosystems and responses over the past 30 years. The study applies social-ecological system thinking in understanding human-environment change. Particular emphasis was put on the role of social protection and natural resources in responding to change, shocks and stressors. The study employed a mixed method approach to gather data which included a household survey, life history interviews, transect walks, focus group discussions as well as secondary sources of information. The results of the study illustrate that shocks and stressors are common in both villages and are likely to increase in severity and frequency with ongoing and rapid human-environmental change, especially climate change. The local responses to change, shocks and stressors are primarily reactive and mainly intensify exploitation of existing natural resources and social protection as safety-nets. In Marwendo village, the villagers relied more on the use and sale of natural resource products readily available to them, whereas in Tshivhulani village they mainly tend to rely on social grants. Thus, in the future, households’ vulnerability might increase, and may be worse in Marwendo village, since important components of current livelihoods remain natural resource-based and climate sensitive. In Tshivhulani village, livelihoods characterised by high dependence on social grants can have severe consequences for households as children get older or elderly members die and grants cease to be available. Social grants therefore only really offer a temporary relief. This coupled with environmentally destructive practices such as brick-moulding in Marwendo village and uncontrolled settlements in Tshivhulani village may reinforce the negative impacts of change and thus undermine sustainable adaptation. The study concludes that multiple lenses for understanding the links between livelihood and ecosystem vulnerability in the context of the ongoing and rapid change are essential, and these provide insights into how different policy options for livelihood improvement and social protection might be appropriate for reducing household and ecosystem vulnerabilities in the future.
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Lived experience of positional suffering for room attendants at Rhodes University: insights for the transformation agenda
- Authors: Toli, Vuyolwethu
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/7890 , vital:21320
- Description: Taking insights from the domestic work literature both locally and internationally, this study explores the lived experiences of room attendants who work as cleaners in the students’ residences at Rhodes University. The study focuses on the housekeeping division of Rhodes University. Data was generated from in-depth individual interviews and focus groups with 26 women and 3 men participants (aged between 28 and 60) who work as room attendants, and who were recruited from the residences across the university. The phenomenological approach allowed the participants to articulate in-depth, their experiences of working as room attendants in intimate spaces. This study used a triangulated conceptual framework, which amalgamated the concepts of pain, social space and intersectionality, and exploitation under the umbrella concept of positional suffering. Within a higher education transformation agenda which has marginalised the experiences of unskilled workers at the university, the study seeks to bring insights to the understanding of transformation at Rhodes University through the experiences of the being-in-the-world of room attendants.
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Lizalise Idinga Lakho [Honour Thy Promise]: The Methodist Church Women’s Manyano, the Bifurcated Public Sphere, Divine Strength, Ubufazi and Motherhood in Post-Apartheid South Africa
- Authors: Ngcobozi, Lihle
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/17717 , vital:22271
- Description: This study examines the socio-political role of the Christian church based women’s Manyano organisations in post-apartheid South Africa. Specifically, the study examines the ways in which the women’s Manyano organisations offer black women a site for the performance of citizenship. The study is based on life history interviews conducted with seventeen members of the Methodist Church Women’s Manyano of the Lamontville Circuit in Kwa-Zulu Natal. The study shows that dominant literature on Manyano women is primarily located in the historiography of the formation of Manyano groups within the historical development of the black church from the moment of missionary contact in South Africa. This literature shows that the missionaries used the coming together of black women in the church to promote ideas of devout domesticity that are based on Anglophone Victorian womanhood. This literature also shows that the structural constraints of colonisation and apartheid transformed the black church into a counterpublic space which focused largely on the liberation of the black majority from political, economic, and social exclusion from the colonial and apartheid public sphere. These constraints also transformed the role of women’s Manyano organisations to become an important space from which black women came to resist and defeat apartheid. This study shows that this historical framing of women’s Manyano groups has shaped their role in post-apartheid South Africa. Located in the African feminist theory, the study argues that Manyano women’s publicness is not limited to gendered expressions of the public and private sphere. Instead, Manyano women demonstrate that their publicness in post-apartheid South Africa ought to be understood through a combination of the varied identities that they straddle, such as those of a politically and culturally defined womanhood and communally based motherhood, which express their understanding and performance of citizenship. The thesis, therefore, argues that the contemporary role and functioning of Manyanos is located within both the hegemonic public sphere that is granted by the civil liberties of the new South Africa, and the historical black bifurcated counterpublic -which combined offer black women the ability to devise strategies to confront present-day socioeconomic challenges such as structural poverty that shapes the lives of the majority of black women in post-apartheid South Africa. The study contributes, therefore, to the reconstruction of the concept of the public sphere through the use of Manyano women’s dynamic position in post-apartheid South Africa. It shows that the dualist nature of Manyano women’s position and identity allows for a multifaceted approach in the understanding of citizenship for Manyano women today. Furthermore, and importantly, the study shows that the complex roles that Manyano women navigate within the different spheres complicate the interpretations of womanhood and motherhood as understood in dominant (white western) feminist theory in ways that often lead to the delegitimisation and erasure of Manyano women’s contributions to ideas about post-apartheid feminisms.
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