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Influence of Tamarix species on soil physicochemical properties and mapping its distribution and density using GIS in Western Cape, South Africa

  • Authors: Mlahlwa, Asiphe
  • Date: 2020
  • Subjects: Tamarisks
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10353/18588 , vital:42611
  • Description: Tamarix ramosissima invasion is unarguably one of the worst ecological disasters in South Africa and is classified under category 1b by the National Environmental Management: Biodiversity Act 2014 (NEM: BA). The exotic Tamarix species was introduced in South Africa during the early 1900s as an ornamental or phytoremediating plant. This study was conducted to assess Tamarix distribution and evaluate its impact on soil physicochemical properties in two sites at Leeu River and Olifant River in Western Cape, South Africa. Samples were collected from Leeu River (which consists both the exotic and native Tamarix species) and Olifant River (only exotic Tamarix species). Three transects were laid from the water point outwards, with exotic Tamarix invading the river bank (first transect), the control on the open land (second transect) and the native Tamarix at the far end of the study site (third transect) in Leeu River. In Olifant, transects were laid according to the degree of invasion, low Tamarix density transect was referred to as T1, the medium as T2 and the high density as T3. Soil samples from each transect were taken from three points, at three soil depths (0-10, 10-20 and 20-30 cm) during winter and summer. Soil physiochemical properties such as soil pH, electro-conductivity (EC), total nitrogen (TN), total carbon (TC), soil organic carbon (SOC), sodium (Na+ ), potassium (K+ ), Calcium (Ca2+), Magnesium (Mg2+), bulk density, soil texture and sodium adsorption ratio (SAR) were determined. Soil chemicals properties including EC, Na+ , SAR, K+ and Mg2+ were found significantly higher under the native and the exotic Tamarix species when compared to Tamarix free soils. In general, salinity of surface soils (0–10 cm) was greater than those in the deeper soils with 5.05 mS/cm and 4.73 mS/cm observed under exotic and native Tamarix species, respectively. High levels of EC, K+ , Ca2+, Na+ , SAR, TN, TC and SOC were observed under T3, followed by T2 with the lowest being recorded in T1 at 0-10 cm. Unlike the soil EC, the effect of Tamarix density on soil pH at 0-10 cm soil profile was not significant. Alterations of soil physicochemical properties were more pronounced under the high Tamarix density as compared to the low invasion. Increased in distance from the river was related to a higher density of the invasive species and also topography had a major role in the change of species density. An increase in Tamarix density, results in high leaf litter which in turn results in salinity and soil nutrient at 0-10 cm. Soil salinity was dramatically increased under Tamarix species. Tamarix species are capable of altering the soil properties making it conducive for their growth.
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  • Date Issued: 2020

Influence of the jobs fund on the unemployment rate in South Africa

  • Authors: Banzana, Lubabalo
  • Date: 2020
  • Subjects: Unemployment--South Africa
  • Language: English
  • Type: Thesis , Masters , MPhil
  • Identifier: http://hdl.handle.net/10948/47508 , vital:40119
  • Description: Since the dawn of its democracy, South Africa has experienced multiple changes in its key economic policy. These changes were meant to address the poverty, inequality, and unemployment in the country. The post-1994 years have seen economic policies change from the Reconstruction and Development Programme (RDP) in 1994 to the Growth, Employment and Redistribution framework (GEAR) in 1996. Then came the Accelerated and Shared Growth Initiative for South Africa (AsgiSA) in 2006 and, most recently, the New Growth Path (NGP) and the National Development Plan (NDP) in 2010 and 2013, respectively (Chibba and Luiz, 2011). Despite numerous efforts made to change economic policy throughout the years, South Africa is still faced with the challenge of a high unemployment rate. To manage this issue, the South African government has introduced several interventions, such as the creation of a Jobs Fund in 2011, which meant that an initial investment amount of R9 billion was contributed by the government towards the attainment of its objectives. The research methodology used in this study was quantitative and, more specifically, based on the descriptive method of research.The primary objective of the research was to investigate the influence and effectiveness of the Jobs Fund through its job creation and skills development initiatives that were mechanisms to reduce the unemployment rate. The research aimed to assess the success of the Fund thus far in providing funding towards sustainable job creation and long-term employment. In addition, the study analysed the Fund’s influence in reducing in unemployment. In answering the primary objective of the research, it was not entirely possible to measure the influence of the Jobs Fund on the unemployment rate in South Africa, as other key factors need to be taken into consideration when making such an assessment. This is highlighted by the fact that, even though close to R7 billion has already gradually been committed to job creation activities by the government since 2011, the unemployment rate has continued to grow. Therefore, a study of the influence of the Jobs Fund on the unemployment rate would need take into consideration other key factors that influence unemployment.
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  • Date Issued: 2020

Informal learning in local farming practices by rural women in the Lake Chilwa Basin, Malawi: towards coping and adaptation to climate variability and climate change

  • Authors: Mphepo, Gibson Yadunda
  • Date: 2020
  • Subjects: Women -- Non-formal education - Malawi , Non-formal education -- Malawi , Women -- Malawi -- Social conditions , Crops and climate -- Malawi , Agricultural extension work -- Government policy -- Malawi , Environmental education -- Malawi
  • Language: English
  • Type: text , Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10962/167540 , vital:41490
  • Description: Evidence reveals that informal learning is a neglected research area, globally and nationally. Informal learning, like formal and non-formal learning, is context specific. In the case of my study, the context was in local maize cultivation and the associated local farming practices which are also neglected. Research has shown that rural women in Malawi are significant change agents in socio-economic sectors, yet they are heavily affected by inequality. For example, extreme weather events of droughts and floods in the Lake Chilwa Basin, disproportionately affect more women than men because of their traditional gendered roles such as home care. The complexity of the dualistic nature of being change agents and victims of injustices at the same time offers a catalytic opportunity for potentially transformative social learning for transformative adaptation. Against this backdrop, I conducted a study to investigate and expand informal learning processes to contribute to building the resilience of women and other community members in Domasi and Nsanama Extension Planning Areas (EPA) within the Lake Chilwa Basin. Specifically, the study answered the following question: “How do drought and inter-seasonal dry spells influence informal learning processes to enable transformation adaptation among rural women cultivating maize in the Lake Chilwa Basin, Malawi?” To address the question, the first stage was to review local farming practices and the associated informal learning processes in Malawi. I then used third generation Cultural Historical Activity Theory (CHAT) as an overarching theoretical framework to guide the subsequent research processes which were split into three main phases: mirror data collection for expansive learning, formative change laboratory workshops, and data analysis and reflection. CHAT is a theoretical framework that helps us comprehend and analyze the relationship between the human mind (i.e. what people think and feel) and activity (what people do). It is a formative and activist learning theory that posits learning as occurring through collective activities to meet or change a common object (Mukute and Lotz-Sisitka, 2012, p. 345). For Koszalka and Wu, 2001(p. 493), within a CHAT framework, knowledge is socially constructed by individual learners, building on existing historical experiences, within the learners’ context. To construct this knowledge, learners use technology or mediating tools, as Vygotsky (1978) calls them. To collect mirror data, I conducted focus group discussions, observation studies, and document analysis. I also conducted key informant interviews with selected extension workers responsible for the two case study sites. The hub of my research constituted change laboratory workshops to expand learning through four of the seven expansive learning actions, namely questioning, analysis, modeling and testing the model. One of the essential procedures I relied on to expand learning during these change laboratory workshops was identification and analysis of contradictions that were mirrored back to women. The use of contradictions as fertile ground for learning is premised on Engstrom’s arguments that contradictions form a catalyst for learning. Data were analysed using two approaches: layered and power relations. A layered analysis is a step-by-step process of understanding a situation from the lower to a higher level (mature stage). For my research, this meant understanding sequential learning from questioning (session 1 – lower level) to testing the model (session 8 – higher level). The second data analysis approach, power relations, relates to the Women Empowerment in Agriculture Index (WEAI), a measure of the degree of women empowerment, their agency and inclusion in farming (Ruth et al., 2013, p. 3). I used this type of power analysis tool because my research was agriculture based. Both data analysis approaches relied on N-vivo which is a form of computer-based qualitative data management software. The software was ideal for my study which was also mostly qualitative. During phase 1 of data collection, I identified five local farming practices associated with local maize cultivation, a focus of my study. These practices were slash and burn (mphanje); traditional insect pest control measures; soil fertility enhancement techniques through kuojeka (crop residue incorporation) and livestock manure; traditional weather forecasts; and multiple cropping (mixed and sequential cropping). Among these, the most preferred by the women I interacted with were kuojeka, livestock manure and mixed cropping. I discovered that these local farming practices are informally learned mainly through word of mouth, observation, trials, women-dominated social networks and drama. I also discovered that some of these informal learning pathways are catalyzed by drought and dry spells. For example, during the 1949 and 2002 drought periods, women reported that they had learned new types of coping strategies such as the use of sawdust and banana root flour in place of maize flour to prepare nsima, a staple food in Malawi. During phase 2, change laboratory workshops, I identified 19 contradictions associated with local farming practices, most of which were related to the Government of Malawi bias towards modern farming practices such as hybrids. Other contradictions were related to traditional structures and norms and religion and traditional beliefs. Solutions were suggested for each of the contradictions. Some of these solutions were tested for their workability. These included setting up diversity blocks (demonstration plots) for local maize cultivation under irrigation and engagement of the youth through WhatsApp groups for the first time at the study sites. The results of the tests show that there is potential to transform local farming practices at the study sites and build social resilience against drought and dry spells. For example, from a local maize demonstration plot in Nsanama Extension Planning Area (EPA), farmers learned that kafula local maize is fast maturing and therefore cushions them against hunger as they wait for the main harvest in later months. Eighty-eight households shared local maize seed harvested from the demonstration gardens for upscaling. The Head of Nsanama EPA had also set up another demonstration garden in 2018-2019 growing season consisting of kafula at Nsanama EPA Headquarters for further informal learning purposes. This research has contributed new knowledge to the existing knowledge base about local farming practices and informal learning. These contributions are in the form of methods I used as well as results obtained. Among the key highlights of my contribution to the knowledge base is the development of scenarios as double stimulation tools for the emerging local farming activity system which emanates from the new model solutions resulting from change laboratory workshops. To the best of my knowledge, this was the first time rural communities were engaged in scenario development in Malawi. The first scenarios of this type were developed in 2010 for the Malawi State of Environment and Outlook Report and the process involved middle to senior managers of various institutions in Malawi. Through historical analysis, my research identified local crops that existed in the past but which are currently non-existent or rare. My study also identified unique local farming practices that even puzzled professionals, including the use of ripe banana peels of makumbuka and sukari to eradicate nansongole grass and native bamboos respectively. Both plant species are considered a nuisance in that they colonize land for cultivation. A breakthrough for radical transformation of local farming practices via informal learning requires development and review of relevant policies in Malawi. Such a process requires evidence. This research has provided background information for this process. For those policies already developed, this research has provided information that can help guide implementation of the generalized list of activities outlined in implementation plans of the respective policies.
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  • Date Issued: 2020

Information needs and information-seeking behaviour of practising medical doctors at Katutura and Windhoek central state hospitals in Namibia

  • Authors: Matsveru, David
  • Date: 2020
  • Subjects: Information behavior Information resources
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10353/17976 , vital:42000
  • Description: This study investigated the information needs and information-seeking behaviour of practising medical doctors at Katutura and Windhoek Central hospitals in Namibia. Anchored on Wilson’s (1996) model of information-seeking behaviour, the purpose of the study was to establish the information required by practising medical doctors to carry out their work, how they seek information, the information sources and resources they use, and the factors that affect them as they do so. Understanding users’ information needs and the way information is disseminated in hospitals is necessary in developing an effective information provision system and ensuring the quality of information services in the hospitals. A mixed-methods research approach was used to meet the objectives of the study. Questionnaires were administered on 140 practising medical doctors at Katutura and Windhoek Central state hospitals, while fifteen doctors were interviewed telephonically, using a semi-structured interview guide. IBM SPSS (Version 25) was used to analyse quantitative data from the questionnaires, while content analysis was used to analyse qualitative data from the interviews. The findings of this research are that practising medical doctors need information mainly for improving clinical decision-making, keeping up-to-date, improving professional knowledge, and continuing education. The study also revealed that medical doctors use a variety of information sources and resources. However, the degree to which information sources are xiii used depends on the clinical context (outpatients, wards and casualty/emergency). Some contextual factors (organisational context, socio-cultural context, and information sources) can either support or hinder doctors in seeking the information they need. The patient is one of the primary information sources for medical doctors. However, language problems are a significant challenge in communicating with patients or patients’ relatives. Lack of patients’ understanding of medical terms and unavailability of properly run libraries in hospitals are some of the factors that affect doctors’ information-seeking behaviour. Participants recommended health education for patients, training of medical doctors on the use of the Internet and ICT, provision of properly run hospital libraries, and improved communication with other international hospitals as some of the ways to improve health information sources and services. Three related models were drawn from the study’s findings, based on Wilson’s (1996) model and literature, namely, the doctors’ decision-making model (DDmM), the clinical context information sources model (CCISM), and the model of information needs and information-seeking behaviour of medical doctors (MINISBMD). The thesis concludes with practical recommendations to enhance the provision of information at Katutura and Windhoek Central hospitals and suggestions for further research.
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  • Date Issued: 2020

Ingqumbo yomthondo kukuzika kohlanga

  • Authors: Mtirara, Zodwa
  • Date: 2020
  • Subjects: Women and literature , Feminism and literature , Gender identity in literature , Masculinity in literature , Sex role in literature , Xhosa poetry , South African poetry (English) , Sex discrimination against women
  • Language: Xhosa, English
  • Type: text , Thesis , Masters , MA
  • Identifier: http://hdl.handle.net/10962/154095 , vital:39562
  • Description: Le yingqokelela yemibongo ebhentsisa ukutyeshelwa kobuntu nobuchule bamanina yinkolo yobuKrestu, kunye nenkolo yemveli okanye inkolo yesiNtu. Ikwenza oku ngokwaphula imithetho nemigaqo siseko yenkolo yobuKrestu nesiNtu sakwaXhosa malunga nokufanelekileyo ukuba owasetyhini akuthethe okanye akwenze. Ikwabhentsisa nokuhlukunyezwa kwabasetyhini, ibuza nemibuzo ngesimo esizifumana sikuso mva-nje. Ichukunyiswe bubomi bam kanye nobamanye amanina endiphila nawo ekuhlaleni. Ikubhentsisa ke oku ngokungenalusini njengoko imbongi uLesego Rampolokeng esenza. Izeka mzekweni ezibhalweni zooNtozakhe Shange, Diane Di Prima, Lidia Yuknavitch, noWame Molefhe. Iphikisa indlela ekubhalwe ngayo ngamanina ngooMema nooJolobe, isenza oko uNontsizi Mgqwetho angazange ade afikelele ukukwenza njengombhali wasetyhini.
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  • Date Issued: 2020

Initiating biological control for Nymphaea mexicana zuccarini (Nymphaeaceae) in South Africa

  • Authors: Reid, Megan Kim
  • Date: 2020
  • Subjects: Nymphaea mexicana zuccarini -- Biological control -- South Africa , Nymphaeaceae -- Biological control -- South Africa , Invasive plants -- Biological control -- South Africa
  • Language: English
  • Type: text , Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10962/144510 , vital:38352
  • Description: Nymphaea mexicana Zuccarini (Nymphaeaceae) is an aquatic plant originating from south-eastern USA that is becoming increasingly invasive in South Africa as other invasive aquatic plants are being managed successfully through biological control. Mechanical and chemical control of aquatic weeds is expensive, damaging to the environment, and only effective in the short term, so biological control is more desirable as a management strategy for N. mexicana. The biological control of invasive alien plants requires that agents are host specific so that non-target risks are mitigated. For success to be achieved, it is important to ensure that the genetic structure of invasive populations is clarified so that agents can be collected from populations in the native range that match genetically to populations in the invasive range. This is especially important in cases where the morphology of invasive alien plants does not reflect genetic differences between populations. A previous study of the genetic structure of the invasive populations of N. mexicana in South Africa suggests the presence of hybrid forms of the plant in South Africa, with only one of these populations matching with samples from the native range. However, the study only used samples from two sites in the native range using amplified fragment length polymorphisms (AFLPs), so it was necessary to conduct further genetic analyses using samples from more sites in the native range. Hence, the first aim of this study was to develop a better understanding of the genetic structure of N. mexicana populations in the native and invaded range. Genetic samples were collected from sites in the native range during field surveys for potential biological control agents, and inter-simple sequence repeats (ISSRs) were used to compare the genetic structure of invasive and native populations of N. mexicana in South Africa. The results from these analyses suggest that seven of the 14 investigated invasive populations of N. mexicana in South Africa are genetically similar to populations in the native range, while the remaining seven populations are likely to be hybrid forms of the plant. This knowledge will be useful to target populations for biological control and highlights the need for further genetic analyses to determine the parentage of these hybrids so that biological control efforts are more likely to be successful. The initiation of a biological control programme requires that a series of steps are taken in order to maximise the likelihood that this form of intervention will be successful. The first few steps include: identification of the target weed and its genetic structure; exploration in the native range for potential biological control agents; and prioritisation of these agents based on factors such as climatic and genetic compatibility, feeding damage, abundance, and likely host range. Hence, the second aim of this study was to conduct surveys for potential biological control agents in the native range of N. mexicana, and to prioritise these agents. Field surveys were conducted between August and October in 2018 at 17 sites in Florida, Louisiana, and Texas, USA. Sites were selected based on climatic similarity of native sites compared to invasive sites by use of MaxEnt modelling. Native N. mexicana plants were searched for natural enemies, and these were prioritised based on feeding damage, abundance, incidence, and observations of field host range. Two species were prioritised: Bagous americanus LeConte (Coleoptera: Curculionidae) and Megamelus toddi Beamer (Hemiptera: Delphacidae). These species will be imported into quarantine facilities at Rhodes University for host specificity tests to be conducted. Understanding the factors that contribute to the successful establishment of biological control agents is important to improve the efficiency and reduce the costs incurred during the initiation of biological control programmes. Acquiring knowledge of the factors that predict the efficacy of biological control agents is similarly important, and these factors are discussed in the last chapter of this study. The challenges of the biological control of hybrids are also considered, and recommendations are made for the control of N. mexicana and other plants in South Africa.
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  • Date Issued: 2020

Innovative construction methods to address housing demand in South Africa

  • Authors: Tsosane, Mosa Brunette
  • Date: 2020
  • Subjects: Construction projects -- South Africa -- Management Housing -- South Africa
  • Language: English
  • Type: Thesis , Masters , MSBE
  • Identifier: http://hdl.handle.net/10948/49628 , vital:41742
  • Description: In South Africa, there is a prolonged waiting period for the needy to receive subsidy housing. Due to several factors contributing to this housing delivery delay, there is proliferation of informal settlements. The factors include fast-paced urbanization, which is mostly triggered by rural-urban migration that prompts urban growth and its attendant challenges that exert intense demands on the local government, thus the government is unable to keep up with the demands for housing and other related needs. The currently used conventional method (masonry construction) of construction for the construction of subsidy housing is perceived to be procedural and time consuming which is also one of the factors contributing to the delay in housing delivery. According to the research, interventions in the built form could be applied to address these issues. The focus of this study was on the construction aspect of the factors that contribute to the delay/problem. The primary aim for this study was to explore innovative prefabricated modular construction methods, proposed as alternatives to the construction of government subsidy housing in order to address housing demands in informal settlements. The research onion diagram was adopted and methodically followed as the research design for this study, whereby the data collection method that was adopted as part of the research onion was included a Desktop Survey and a Site Survey. The population and sample of this study comprised of a mixed group of participants, which were selected in accordance with the research attributes. The research findings indicate that the modular construction methods can indeed be used as an alternative to address some of the subsidy housing delivery problems. However, the challenge of any new innovative solution is to overcome end-user scepticism as resistance is inevitable. The research recommendation is for this research work to be taken to the next phase which would involve simulations of life size experimental models of these proposed innovative methods of construction, to further assess the viability of these proposed construction methods, before they may be implemented.
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  • Date Issued: 2020

Insect herbivores associated with Lycium ferocissimum (Solanaceae) in South Africa and their potential as biological control agents in Australia

  • Authors: Chari, Lenin D , Mauda, EV , Martin, Grant D , Raghu, S
  • Date: 2020
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/407035 , vital:70331 , xlink:href="https://hdl.handle.net/10520/EJC-203b8dbc7b"
  • Description: Lycium ferocissimum Miers (Solanaceae) is an indigenous shrub in South Africa but has become invasive in several countries including Australia, where chemical and mechanical control methods have proved costly and unsustainable. In Australia, biological control is being considered as a management option, but the herbivorous insects associated with the plant in its native range are not well known. The aim of this study was to survey the phytophagous insects associated with L. ferocissimum in South Africa and prioritise promising biological control agents. In South Africa, the plant occurs in two geographically distinct areas, the Eastern and Western Cape provinces. Surveys for phytophagous insects on L. ferocissimum were carried out repeatedly over a two-year period in these two regions. The number of insect species found in the Eastern Cape Province (55) was higher than that in the WesternCapeProvince (41), but insect diversity based on Shannon indices was highest in the Western Cape Province. Indicator species analysis revealed eight insect herbivore species driving the differences in the herbivore communities between the two provinces. Based on insect distribution, abundance, feeding preference and available literature, three species were prioritised as potential biological control agents. These include the leaf-chewing beetles Cassida distinguenda Spaeth (Chrysomelidae) and Cleta eckloni Mulsant (Coccinellidae) and the leaf-mining weevil Neoplatygaster serietuberculata Gyllenhal (Curculionidae).
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  • Date Issued: 2020

Insight into the influence of the internet on the buying behaviour of new car customers during their decision-making process

  • Authors: Dlamini, Andile
  • Date: 2020
  • Subjects: Consumer behavior -- South Africa , Decision making Electronic commerce
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: http://hdl.handle.net/10948/50502 , vital:42205
  • Description: The study investigates the influence of the internet on the buying behaviour of new cars customers during their decision-making process. The advent of the internet has transformed the manner customers search for information to support their purchase decision making process. The traditional purchase process for new cars has been impacted by the growth of the internet and other related digital technologies like mobile phones particularly smartphones. The ease of access to the internet has empowered consumers by promoting market transparency which has allowed customers to have influence on products and prices. Online shopping experience has conditioned consumer buying behaviour as they now research, select and buy new cars differently. The frequency of the dealership visits has significantly decreased as most of the time is spent online. As the result, the role of a salesperson in the new car buying decision process is becoming redundant and, in most instances, reduced to transactional dealmaker. The study explores how the phenomenon of the internet has radically changed the consumer buying behaviour and how this poses a threat to the future of the dealerships in their current form of brick and mortar as well as the role of a salesperson in the car buying process.
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  • Date Issued: 2020

Institutional culture and internationalisation: a study of Black African academics’ experiences at Rhodes University

Integrated computational approaches and tools for allosteric drug discovery:

  • Authors: Amamuddy, Olivier S , Veldman, Wade , Manyumwa, Colleen , Khairallah, Afrah , Agajanian, Steve , Oluyemi, Odeyemi , Verkhivker, Gennady M , Tastan Bishop, Özlem
  • Date: 2020
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/163012 , vital:41004 , https://doi.org/10.3390/ijms21030847
  • Description: Understanding molecular mechanisms underlying the complexity of allosteric regulation in proteins has attracted considerable attention in drug discovery due to the benefits and versatility of allosteric modulators in providing desirable selectivity against protein targets while minimizing toxicity and other side effects. The proliferation of novel computational approaches for predicting ligand–protein interactions and binding using dynamic and network-centric perspectives has led to new insights into allosteric mechanisms and facilitated computer-based discovery of allosteric drugs. Although no absolute method of experimental and in silico allosteric drug/site discovery exists, current methods are still being improved. As such, the critical analysis and integration of established approaches into robust, reproducible, and customizable computational pipelines with experimental feedback could make allosteric drug discovery more efficient and reliable. In this article, we review computational approaches for allosteric drug discovery and discuss how these tools can be utilized to develop consensus workflows for in silico identification of allosteric sites and modulators with some applications to pathogen resistance and precision medicine. The emerging realization that allosteric modulators can exploit distinct regulatory mechanisms and can provide access to targeted modulation of protein activities could open opportunities for probing biological processes and in silico design of drug combinations with improved therapeutic indices and a broad range of activities.
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  • Date Issued: 2020

Integrated landscape change analysis of protected areas and their surrounding landscapes: application in the Brazilian Cerrado

  • Authors: Bellón, Beatriz , Blanco, Julien , de Vos, Alta , de Oliviera Roque, Fabio , Pays, Olivier , Renaud, Pierre-Cyril
  • Date: 2020
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/148681 , vital:38763 , https://doi.org/10.3390/rs12091413
  • Description: Remote sensing tools have been long used to monitor landscape dynamics inside and around protected areas. Hereto, scientists have largely relied on land use and land cover (LULC) data to derive indicators for monitoring these dynamics, but these metrics do not capture changes in the state of vegetation surfaces that may compromise the ecological integrity of conservation areas’ landscapes. Here, we introduce a methodology that combines LULC change estimates with three Normalized Difference Vegetation Index-based proxy indicators of vegetation productivity, phenology, and structural change. We illustrate the utility of this methodology through a regional and local analysis of the landscape dynamics in the Cerrado Biome in Brazil in 2001 and 2016. Despite relatively little natural vegetation loss inside core protected areas and their legal buffer zones, the different indicators revealed significant LULC conversions from natural vegetation to farming land, general productivity loss, homogenization of natural forests, significant agricultural expansion, and a general increase in productivity. These results suggest an overall degradation of habitats and intensification of land use in the studied conservation area network, highlighting serious conservation inefficiencies in this region and stressing the importance of integrated landscape change analyses to provide complementary indicators of ecologically-relevant dynamics in these key conservation areas.
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  • Date Issued: 2020

Integrating Ecosystem Services and Disservices in Valuing Smallholder Livestock and Poultry Production in Three Villages in South Africa

  • Authors: Herd-Hoare, Shannon C , Shackleton, Charlie M
  • Date: 2020
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/176089 , vital:42659 , https://doi.org/10.1016/j.ufug.2020.126740 , https://doi.org/10.21504/RUR.c.5388515.v1
  • Description: This study presents an integrated examination of both the ecosystem services (ES) and ecosystem disservices (EDS) associated with smallholder animal husbandry in rural livelihoods in three villages in southeast South Africa. It recognises the contribution of ES supporting and resulting from smallholder livestock and poultry production, but also details the limiting factors or EDS, such as tick-borne disease, birds of prey or unpalatable rangeland, produced by the same system. Using a mixed-methods approach, including focus group discussions with various Participatory Learning and Action (PLA) activities, key informant interviews, household surveys and land-use change mapping on GIS, we consider the relative value and benefits from ES after the effects of EDS, as well as the management and strategies that households adopt to minimise EDS.
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  • Date Issued: 2020

Integrating livelihoods and forest conservation through beekeeping in northern KwaZulu-Natal:

  • Authors: Ricketts, K , Shackleton, Charlie M
  • Date: 2020
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/176358 , vital:42687 , https://doi.org/10.1080/0376835X.2019.1698408
  • Description: South Africa has potential to export honey products through promoting beekeeping as an income generating opportunity amongst rural communities. Formalised beekeeping may also reduce wild fires initiated by hunters of wild bee hives. This study examined the contribution of the African Honey Bee (AHB) initiative to rural livelihoods and the incidence of forest fires using a mixed methods approach. The initiative increased incomes of newly trained and active beekeepers, although success rates and honey yields were variable. Core challenges included not catching bees, theft and vandalism of hives, insufficient bee forage, drought and pests. Most respondents also perceived an increase in crop size since AHB began, although few attributed this to pollination from the bees. The number of wild fires attributed to honey hunters more than halved after AHB began. Future steps need to reduce the challenges and integrate beekeeping into broader agriculture and forest conservation programmes.
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  • Date Issued: 2020

Integrating local knowledge when mediating learning of food preservation in a Namibian multicultural Grade 6 class

  • Authors: Shetunyenga, Shetunyenga Fillipus
  • Date: 2020
  • Subjects: Food -- Preservation -- Study and teaching (Elementary) -- Namibia , Ethnoscience -- Study and teaching (Elementary) -- Namibia , Ethnoscience -- Namibia , Education, Elementary -- Namibia , Multicultural education -- Namibia
  • Language: English
  • Type: text , Thesis , Masters , MEd
  • Identifier: http://hdl.handle.net/10962/163602 , vital:41052
  • Description: The challenge posed by multicultural classrooms has been acknowledged in many studies. Some scholars believe that the knowledge learners bring to school from their homes or community forms a basis for the knowledge to be acquired at school. That is, if learners’ cultural experiences and/or indigenous knowledge are integrated into teaching of science, learners might make good sense of science. Even though the Namibian National Curriculum has responded well to the calls of recognising and integrating indigeno us knowledge during teaching and learning, it has failed to provide guidance on how this should be done. Therefore, there is a need to minimise the gap between the intention of the National Curriculum and the implementation of this intended curriculum at classroom level. It is against this background that this study sought to investigate whether or not learners’ conceptions and attitudes are influenced by integrating local or indigenous knowledge when teaching food preservation in a Namibian multicultural classroom context. Underpinned by an interpretive paradigm, the study took the form of a mixed-method case study approach. It was conducted at an urban combined school in the Oshana region, Namibia. The sample consisted of 29 Grade 6 learners doing Agricultural Science, the grade 6 Agricultural Science teacher and four community members from different cultural groups. The community members were invited to demonstrate how they culturally preserve mahangu (wheat), fish, milk, and meat in their respective cultures. Data were generated using the pre-and post-intervention questionnaires, a group activity, observations (videotaped lessons) and learners’ journal reflections. Quantitative data from the pre- and post-intervention questionnaires were analysed deductively and presented in tables and graphs. On the other hand, a thematic approach was used to inductively analyse qualitative data, where Vygotsky’s (1978) socio-cultural theory was used as a theoretical lens focusing on culture, mediation, and social interactions. The findings of this study revealed that learners’ conceptions, attitudes, and interest shifted positively as a result of the integration of local or indigenous knowledge on food preservation. Additionally, during the presentations by the community members, learners were actively engaged, asking questions and showing interest in learning about other cultures. The study thus recommends that Agricultural Science or science teachers should, where possible, make efforts to integrate local or indigenous knowledge in their multicultural classrooms.
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  • Date Issued: 2020

Integrating quality management principles into policies and procedures for water and sanitation provision in the Cape Town Metro

  • Authors: Madliwa, Nokhanyo
  • Date: 2020
  • Subjects: Total quality management local government Quality assurance
  • Language: English
  • Type: Thesis , Doctoral , DPA
  • Identifier: http://hdl.handle.net/10353/18882 , vital:42995
  • Description: The study aims to find a way of improving water and sanitation services through the standardisation of policies and procedures in Reticulation, Waste Water and Bulk Water. It further aims to develop and test an IQM-based model that improves policy and procedure standardisation for the provision of quality water and sanitation services at municipality level. The researcher regards effective IQMS as one of the possible mechanisms that can contribute to the improvement of standardised policies and procedures in quality water and sanitation provision. This study examined the effects of IQM on the standardisation of policies and procedures for the provision of quality water and sanitation services in the Utility Department of the Cape Town Metro, especially in Reticulation, Waste Water and Bulk Water. The study saw a possible link between the effectiveness of IQM and the effective provisioning of quality water and sanitation. The mixed method approach was used. Quantitative and qualitative methods were both used in order to support each other during data analysis. Furthermore, the mixed method was adopted to provide an interpretative and analytical balance towards a clearer understanding of the phenomena under study. The quantitative phase was completed first, followed by the qualitative phase to explain the results even further. For the quantitative method, survey data was gathered. The quantitative method was used for historical numerical data purposes when explaining the survey results. Survey data was analysed using statistical analysis. The qualitative method utilised interviews, providing clarity and thick descriptions of the findings, where quantitative methods did not. This research found that the three branches of the Utility Department in the Cape Town Metro under study did not fully comply with the IQMS as shown by the results of the hypothesis testing. In other words, there is partial compliance with ISO 140001, ISO 9001 & OHSAS 18001 in relation to the standardisation of policy and procedure design and development (DD), implementation (IP), examination (EP), review (RP) and assessment (AP). This means that components of IQMS were not fully applied to the standardisation of policies and procedures for the provision of water and sanitation services. The partial standardisation of policy and procedure vi design and development accounted for the lack of the following: Firstly, improvement in the management of infrastructure, secondly in monitoring and evaluation for quality water and sanitation services. The partial standardisation of policy and procedure implementation accounted for the lack of improvement in the corrective measures, technical knowledge and public health knowledge for quality water and sanitation services. The partial standardisation of policy and procedure examination accounted for the lack of improvement in the corrective measures, management of infrastructure; and monitoring and evaluation for quality water and sanitation services. The partial standardisation of policy and procedure review accounted for the lack of improvement in the corrective measures, management of infrastructure; monitoring and evaluation, technical knowledge and public health knowledge for quality water and sanitation services. Last but not least, the partial standardisation of policy and procedure assessment accounted for the lack of improvement in the corrective measures, and technical knowledge for quality water and sanitation services
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  • Date Issued: 2020

Integrating sustainability dimensions into construction labour productivity determinants in Zimbabwe

  • Authors: Moyo, Tirivavi
  • Date: 2020
  • Subjects: Construction industry -- Labor productivity -- Zimbabwe , Construction workers -- Zimbabwe Construction industry -- Employees -- Zimbabwe Construction industry -- Management
  • Language: English
  • Type: Thesis , Doctoral , DPhil
  • Identifier: http://hdl.handle.net/10948/46207 , vital:39514
  • Description: Low construction labour productivity and inadequate welfare of construction workers is a compound challenge in Zimbabwe. This challenge is due to shortcomings situated in the Decent Work Agenda. Whilst a plethora of contributory factors exists, those that affect the Zimbabwean construction industry were identified for interrogation. Therefore, the study aimed to improve and sustain construction labour productivity in Zimbabwe through fulfilling significant decent work substantive elements, in consideration of demographic variables of stakeholders. A cross-sectional survey research strategy was utilised with quantitative data being collected from selected respondents through the use of questionnaires. The population for the study consisted of randomly selected construction companies registered with the Construction Industry Federation of Zimbabwe and based in Harare, Bulawayo and Shurugwi where site managers’/project managers’ participated. Construction skilled and semi-skilled workers on thirteen (13) construction sites, situated within the same study area, participated in the study. Educators from technical and vocational training institutions and respondents from relevant regulatory bodies were also selected to participate in the study. Quantitative data analysis methods which included Pearson chi-squared tests, Mann-Whitney U tests; Kruskal-Wallis tests, Pearson bivariate correlation method and Regression analysis were utilised. Demographic variables (age, gender, designation, educational levels and experience) were utilised to determine the existence of statistically significant differences in respondents’ perceptions. Construction companies are encouraged to implement corporate social responsibility strategies through equipping workers of different educational levels with knowledge and skills that can be transferred to and benefit themselves and their communities. Adequately trained construction workers best serve their communities through improving their livelihoods, improved safety and health consciousness and quality workmanship. People centred management aspects were found to be fundamental within construction sites as they promote the welfare of workers and should precede any productivity improvement drives. Technical and vocational training institutions need to inculcate sustainability learning objectives within their curricula if any meaning strides in enhancing welfare and productivity of workers is to be achieved. Also, establishing structured on-the-job training that incorporates sustainability learning objectives to achieve workers’ safety on sites is essential. There was a consensus that working conditions must ensure the welfare of workers first before any productivity gains can be realised. Provision of acceptable decent working conditions for different designations and educational levels was encouraged. A comprehensive model was developed for sustaining construction labour productivity that included statistically significant regression models and derived statistically significant demographics from construction labour productivity determinants under study. Validation of the regression models was undertaken through cross-validation and comparison with existing theory. Tenable labour productivity performance measurement and reporting must be inclusive of decent work accomplishments. Short-term interventions that include awareness campaigns and provision of adequate working conditions are required for project-based resolutions whilst, long-term interventions are required where structural reforms within the training of skilled, semi-skilled workers and managers are required, for continuous improvement.
  • Full Text:
  • Date Issued: 2020

Integrative taxonomy reveals hidden diversity in the southern African darters genus Nannocharax Günther 1867 (Characiformes: Distichodontidae):

  • Authors: Bragança, Pedro H N , Smith, Timothy G , Vreven, Emmanuel J W M N , Chakona, Albert
  • Date: 2020
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/163510 , vital:41044 , https://0-doi.org.wam.seals.ac.za/10.1111/jfb.14535
  • Description: The present study explored the diversity of Nannocharax within southern Africa by implementing three species delimitation methods for a data set consisting of 37 mitochondrial cytochrome oxidase subunit I sequences. Two unilocus coalescent methods, the General Mixed Yule Coalescent (GMYC) and the Bayesian implementation of the Poisson Tree Processes (bPTP), and a genetic distance method, the Automatic Barcode Gap Discovery (ABGD), were applied. Both GMYC and bPTP delimited the same operational taxonomic units (OTUs), revealing a higher diversity for the genus in the region than previously recognised, whereas the ABGD failed to delimit the same candidate species.
  • Full Text:
  • Date Issued: 2020

Integrative taxonomy reveals hidden diversity in the southern African darters genus Nannocharax Günther 1867 (Characiformes: Distichodontidae):

  • Authors: Bragança, Pedro H N , Smith, Timothy G , Vreven, Emmanuel J W M N , Chakona, Albert
  • Date: 2020
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/163543 , vital:41047 , https://0-doi.org.wam.seals.ac.za/10.1111/jfb.14535
  • Description: The present study explored the diversity of Nannocharax within southern Africa by implementing three species delimitation methods for a data set consisting of 37 mitochondrial cytochrome oxidase subunit I sequences. Two unilocus coalescent methods, the General Mixed Yule Coalescent (GMYC) and the Bayesian implementation of the Poisson Tree Processes (bPTP), and a genetic distance method, the Automatic Barcode Gap Discovery (ABGD), were applied. Both GMYC and bPTP delimited the same operational taxonomic units (OTUs), revealing a higher diversity for the genus in the region than previously recognised, whereas the ABGD failed to delimit the same candidate species.
  • Full Text:
  • Date Issued: 2020

Inter-population similarities and differences in predation efficiency of a mosquito natural enemy

  • Authors: Cuthbert, Ross N , Dalu, Tatenda , Wasserman, Ryan J , Weyl, Olaf L F , Froneman, P William , Callaghan, Amanda , Dick, Jaimie T A
  • Date: 2020
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/466928 , vital:76799 , https://doi.org/10.1093/jme/tjaa093
  • Description: Predation is a critical factor that mediates population stability, community structure, and ecosystem function. Predatory natural enemies can contribute to the regulation of disease vector groups such as mosquitoes, particularly where they naturally co-occur across landscapes. However, we must understand inter-population variation in predatory efficiency if we are to enhance vector control. The present study thus employs a functional response (FR; resource use under different densities) approach to quantify and compare predatory interaction strengths among six populations of a predatory temporary pond specialist copepod, Lovenula raynerae, from the Eastern Cape of South Africa preying on second instar Culex pipiens complex mosquito larvae.
  • Full Text:
  • Date Issued: 2020
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