The diet of the Subantarctic (A. Tropicalis) and Antarctic (A. Gazella) Fur seal at Marion Island
- Authors: Mgibantaka, Nonkoliso Felicia
- Date: 2013
- Subjects: Southern fur seals -- Feeding and feeds -- Antarctica , Seals (Animals) -- Antarctica , Marine ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10729 , http://hdl.handle.net/10948/d1021104
- Description: Studying the diet of marine top predators is important for understanding the trophic ecology of the predators but also the distribution, abundance and seasonal variation of prey species. Dietary studies on subantarctic fur seals (Arctocephalus tropicalis) and Antarctic fur seals (A. gazella) is important for assessing their role as predators in the Southern Ocean. Seven hundred and sixty four scats were collected from an A. tropicalis colony at Cape Davis while 659 scats were collected from an A. gazella colony at Watertunnel stream from April 2006 to March 2010. Hard remains such as fish otoliths and cephalopod beaks were used for identification and quantification of prey. A. tropicalis diet comprised of three animal groups (fish, cephalopod and crustaceans) while A. gazella diet was made up of four animal groups (fish, cephalopods, crustaceans and seabirds). Fish contributed substantially more than other prey items in the diet of both fur seal species over the study period. Both species fed predominantly on fish of the family Myctophidae which constituted a numerical abundance of 98.9 percent in scats for both species combined. A. tropicalis fed on fish prey species from eight families, namely: Myctophidae, Notosudidae, Paralepididae, Nototheniidae, Bathylagidae, Chlorophthalmidae, Sternoptychidae and Photichthyidae while A. gazella fed on fish from six of these families, with Chlorophthalmidae and Photichthyidae not represented in its diet. Cephalopods and crustaceans were found in low numbers in the diet of both seal species and seabird remains were only found in the diet of A. gazella. Numerically, the most dominant species were from the genus Gymnoscopelus followed by Protomyctophum and then Electrona. In the diet of A. tropicalis, Gymnoscopelus contributed 66 percent, Protomyctophum 18 percent and Electrona 5.9 percent while in the diet of A. gazella Gymnoscopelus, Protomyctophum and Electrona contributed 59.43 percent, 20.24 percent and 14.24 percent respectively. Gymnoscopelus species comprised G. piabilis, G. bolini, G. braueri, G. fraseri, and G. nicholsi; Protomyctophum comprised Protomyctophum bolini, P. choriodon and P. tenisoni while Electrona comprised Electrona antarctica, E. carlsbergi and E. subaspera. Gymnoscopelus piabilis was the most dominant species from this genus while Electrona carlsbergi and Protomyctophum tenisoni dominated the genus Electrona and Protomyctophum respectively. The total number of fish species utilised by A. tropicalis was twenty four while twenty three fish species were identified in A. gazella diet. Bathysauropsis gracilis only featured in the diet of A. tropicalis while Lampanyctus ater and Lepidonotothen larseni were only found in the diet of A. gazella. To compare the diet of the seal species between seasons, a year was divided into three seasons, early summer, late summer and winter. Their diet was also compared between years from 2006 to 2010. Myctophid fish species showed substantial seasonal and annual fluctuations in the diet of the two fur seal species. E. carlsbergi, G. nicholsi and G. piabilis increased in numerical abundance in winter while Melectrona ventralis increased in late summer. The numerical abundance of G. fraseri and P. tenisoni increased in early summer. Generally, the two fur seal species fed on the same prey species. However, there was a significant difference when the diet of both fur seals was compared seasonally. There was no significant difference when the diet of A. gazella was compared annually, although such a difference was apparent for A. tropicalis.
- Full Text:
- Date Issued: 2013
The impact of the Blue Crane development agency on tourism development: a comparative analysis
- Authors: Zokoza, Makhaya
- Date: 2013
- Subjects: Tourism -- South Africa -- Eastern Cape , Travel agents -- South Africa -- Eastern Cape , Economic development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9129 , http://hdl.handle.net/10948/d1018602
- Description: This research investigates the impact of the Blue Crane Development Agency (BCDA) on tourism development by comparing the implementation of the Responsible Tourism Sector Plan of the Blue Crane Route Municipality (BCRM) with the Responsible Tourism Sector Plan of the Sundays River Valley Municipality (SRVM). In the latter instance, there is no development agency involved. A qualitative approach to research is applied with a specific focus on in-depth interviews. The literature review focuses on responsible tourism, local economic development (LED) and development agencies. The research is grounded in the Endogenous Growth Theory. The research notes the phenomenal success of the development agency model for delivery of LED projects. There is a notable growth in the tourism sector within the BCRM. With 45 permanent jobs created, the BCRM is a better place as compared to what it was in the era prior to the establishment of the BCDA. This surpasses by far the number of jobs created in the SRVM where the development agency model does not exist. The South African Local Government Association (SALGA) prefers a district-wide development agency as opposed to a local development agency. The establishment of Cacadu Development Agency (CDA) follows this suggestion. The findings of this research are thus very significant for the SALGA in their pursuit for best practices in LED. Both the BCRM and the SRVM are under-marketed, a negative factor on their tourism growth and development. Placing of billboards at the Ncanara interchange to advertise them would ideally enhance their tourism marketing campaigns. The research also finds that both local municipalities have inadequate monitoring and evaluation systems for projects. In this respect, the research suggests that the Eastern Cape Parks and Tourism Agency (ECPTA) should consider conducting a provincial research covering all the districts, on the contribution of tourism to the local economies. As a provincial entity, the ECPTA would be better placed to undertake that task. They would have less legal restrictions imposed by jurisdictional issues than would a local municipality. The research recommends the relocation of the CDA and the CDM from the metropolitan city of Port Elizabeth to one of the local municipalities. That would most likely increase business tourism, thereby boosting the local economy in the relevant small municipality. In conclusion, this research proposes that the presence of a development agency enhances tourism growth and development in the BCRM.
- Full Text:
- Date Issued: 2013
The exploration of sustainable and diversified livelihood options for residents of Enon-Bersheba
- Authors: Dlamini, Tembile Daniel
- Date: 2012
- Subjects: Sustainable development -- South Africa -- Eastern Cape , Sustainable living -- South Africa -- Eastern Cape , Sustainable living
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9115 , http://hdl.handle.net/10948/d1015643
- Description: Enon-Bersheba (E&B) area has approximately 10 200 hectors of pristine communal land that is rare to find in the Cacadu region. This prime communal land is situated in the bank of the Sundays River Valley in the Eastern Cape Province. Enon-Bersheba falls under the jurisdiction of the Sundays River Local Municipality. The Municipal jurisdiction provides easy access to this pristine commonage that presents opportunities for economic development as well as residential opportunities. This study presents the diversity of sustainable livelihood alternatives from the community‟s perspective. This study finds that giving the beneficiaries of land restitution authority over decision-making on land usage is an important contributor to success. Land is a significant asset, and it becomes more valuable and development-worthy if legal institutions are in place to manage the planning and development processes, for its full utilisation. In addition to this, the study provides a community-driven development framework with which potential development partners can interact to enhance revenue generating activities and strengthen the institutional environment through the formation of community-private-public-partnerships. The participatory research process that was undertaken made essential findings. The study validates the use of livelihoods-based approach to poverty alleviation. A bottom-up participatory process was effective in determining how best Enon-Bersheba communal land can be put into effective and efficient use. Likewise, an integrated approach to development planning was proven to be important. This study proved an extra-ordinary belief that the stability and changed value systems within a community often derive from complex social problems that are inherently dynamic. The involvement of the Independent Electoral Commission in the referendum process for Enon-Bersheba‟s legal entity that will manage the land suggests the credibility of the process. The existing information around potential development options of Enon-Bersheba was consolidated and verified by the community. The awareness of community abilities and resources served to enhance community mobilization for social action. The study provides a framework for development policy imperatives and a new vision for Enon-Bersheba.
- Full Text:
- Date Issued: 2012
An investigation of the role of community development workers: Bitou municipality
- Authors: Gogi, Andile
- Date: 2011
- Subjects: Community development -- South Africa -- Eastern Cape -- Management , City council members -- South Africa , Community development -- Economic aspects , Community development -- Environmental aspects , Community development -- Social aspects , Economic development projects -- Management
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8270 , http://hdl.handle.net/10948/d1015689
- Description: This treatise investigates the role of Community DevelopmentWorkers, with reference to the Bitou Municipality. The treatise comprises five chapters. The concept of Community Development Programme is fairly new in South Africa; therefore, further research is needed on the subject. A literature review was done to establish the concept and the background of the CDWP. A questionnaire was developed in order to obtain primary data from a selected sample group. The data obtained from the questionnaire was statistically analysed and interpreted. The core findings from the analysed questionnaire indicated the following: (a) CDWs clearly understand their role and responsibility, but there is a need for roles and functions to be clearly defined, with detailed terms of reference, to ensure a common understanding with other stakeholders, e.g. Ward Committees, Councillors, Non-governmental organisations, Communitybased organisations, and members of the community. (b) living conditions in the wards improved following the introduction of the CDWP. (c) there is a good relationship between CDWs, Ward Committees and Ward Councillors, but there is also a perception that Ward Committees and Community Development Workers constantly clash or compete in the wards in which they serve. (d) CDWs should not be affiliated to the ruling or any political party. (e) CDWs are confused regarding who is responsible for their remuneration (the Municipality or the Provincial Department of Local Government).
- Full Text:
- Date Issued: 2011
An investigative study of parental involvement in the governance of public and private schools in the Matatiele Distict of the Eastern Cape Province of South Africa
- Authors: Mnukwa, Zolile Maxwell
- Date: 2011
- Subjects: Parents -- School governance , South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , M Ed
- Identifier: vital:18420 , http://hdl.handle.net/11260/d1006644
- Description: This is a comparative study of parental involvement in the governance of public and private schools in the Matatiele District of the Eastern Cape Province of South Africa. Parental involvement can range from occasional attendance of the school functions to partnership through parent teacher organizations and parent management bodies. Education is a national enterprise that requires the co-operation and participation of all the role players who are parents, community, teachers, learners and the Department of Education. The problem to be investigated in this study is: Why is it that parental involvement is more positive in the governance of private schools than that of public schools? Two schools were selected for the study and the researcher administered questionnaires personally by hand and conducted face to face interviews to collect the primary data. The responses of the administered questionnaire were tabulated and recorded in table form so as to give an accurate interpretation of what was revealed in the data. Patterns in the data were considered in order to provide an accurate interpretation of the information. The findings were divided into two, that is: findings from the public school and those from private schools. From the public school it was found that: parents are not involved in the governance of the school; the school does not involve parents on financial matters; parents do not attend meetings when invited; they do not know their roles and responsibilities, for example, according to the South African Schools Act (SASA), parents must be actively involved in the governance of the school in their community and that there is an element of ignorance and negligence on the part of parents towards their children’s education. From the private schools it was found that: parents are more involved in the governance of the school; they attend and participate actively in school meetings; the school involves parents in financial matters and as such the financial support from the parents is very good; parents are much involved in the monitoring of the progress of their learner’s education and are passionate about the school and seem to own the policies and the governance of the whole school system. The conclusion drawn from the study is that private schools allow for parental involvement in the governance of their schools whereas in public schools parental involvement is low.
- Full Text:
- Date Issued: 2011
Hydrogen economy : MEA manufacturing for PEM electrolysers
- Authors: Gojela, Ntombekaya
- Date: 2011
- Subjects: Water -- Electrolysis , Hydrogen
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10380 , http://hdl.handle.net/10948/1483 , Water -- Electrolysis , Hydrogen
- Description: The electrolysis of water was evaluated as a potentially efficient, as a low cost means of hydrogen production. The theoretical energy, voltage, current, and energy efficiencies of water electrolysis were considered by using various catalyst materials used in the fabrication of membrane electrode assemblies used in low temperature water electrolysis systems. Traditionally, iridium based catalysts have shown to be the most suitable material for its use on electrocatalysis of water to form hydrogen. This study showed that a combination of various elements as a binary and or ternary mixture in the base catalyst that was applied to the anode and cathode by using the Adam’s method had shown to give comparatively good results to that of using iridium oxide on its own. These catalysts were characterized by cyclic voltammetry, at different temperatures (30oC-80oC) with a range of catalyst loading of 0.2-0.5 mg.cm-2 noble metals. The study showed that the Ir40Co40 mixture as an anode catalyst was found to show highest hydrogen efficiency of 73 percent with a relatively low over potential of 0.925V at higher temperature of 80oC. The mixture also showed to give the best electrocatalytic activity with a low Tafel slope of 30.1mV.dec-1. Whereas the Ir50Pt50 showed a comparatively lower hydrogen efficiency of 65 percent with a lower over potential of 0.6V at 50oC. Ternary mixed oxide of Ir20Ru40Co40 showed an even lower over potential of 0.5- 0.6V over a large range of temperatures with a low hydrogen efficiency of 44 percent but gave good electrocatalytic activity in terms of the Tafel slope analysis. On the other hand, mixtures with relatively cheaper material such as Nickel in binary mixture systems such as Pt50Ni50 as cathode catalyst was found to show promising performance of a relatively low over potential that was less than 1.4 V with a low hydrogen efficiency of 62.1 percent Ternary cathode catalyst materials such as Pt33Ni33Co33 exhibited good performance with higher hydrogen efficiency of 65.2 percent at lower over potential of 1.2 V and a higher Tafel slope of 133.9 mV.dec-1 at 80 0C.
- Full Text:
- Date Issued: 2011
Financial reforms and interest rate spreads in the commercial banking sector in Kenya
- Authors: Munene, Daniel
- Date: 2006
- Subjects: Finance -- Kenya , Banks and banking -- Kenya , Economics -- Kenya , Interest rates -- Kenya , Economic development -- Kenya
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1070 , http://hdl.handle.net/10962/d1007711 , Finance -- Kenya , Banks and banking -- Kenya , Economics -- Kenya , Interest rates -- Kenya , Economic development -- Kenya
- Description: Financial reforms were a major component of structural adjustment programs deemed necessary for developing countries in the mid 1980s. These were not only meant to improve the sector, but would ultimately enhance economic growth and help in poverty alleviation. At the top of these reforms was financial liberalisation. Kenya, like many other sub-Saharan African countries, undertook financial liberalisation in 1991, one of the measures was decontrolling interest rates. With market driven interest rates in place it was assumed that there would be increased efficiency in bank lending, as well as growth in credit availability as deposits increased. A key indicator of this improved intermediation process would be a narrowing interest rates spread, that is, the margin between the deposit and lending rate. Paradoxically, however, the expected benefits of these reforms did not accrue to Kenya's banking sector. This study focuses on financial reforms and the spread of interest rates in Kenya's banking sector. Using a trend analysis, spanning the period before and after liberalisation, interest rates spread are shown to have escalated dramatically upwards after liberalisation. An analysis of three macroeconomic variables, namely, the exchange rate, inflation rate and economic growth offer little, or inconclusive evidence, that they were the main causes of the wide interest rate spread. In fact, the spread is closely linked to institutional/structural factors such as non-competitiveness in the banking sector, imprudent lending practices and poor and/or inadequate banking supervision. Policies for improving the institutional infrastructure and thus moderating the spreads are highlighted.
- Full Text:
- Date Issued: 2006
Isolation, purification and characterization of a novel glucose oxidase from Penicillium canescens Tt42
- Authors: Simpson, Clinton
- Date: 2006
- Subjects: Penicillium , Glucose , Oxidases
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3975 , http://hdl.handle.net/10962/d1004034 , Penicillium , Glucose , Oxidases
- Description: A novel glucose oxidase from Penicillium canescens (Tt42) was isolated, purified and characterised. The P. canescens Tt42 was cultivated using an optimised growth medium from literature, and maximum glucose oxidase activities of 11.5 U/ml and 6.9 U/ml for the intra- and extracellular fractions were obtained. Maximum glucose oxidase production was achieved after 72 hours at 28°C which coincided with glucose depletion. A total of 1104 U (from 60ml) of glucose oxidase was produced with a biomass specific glucose oxidase activity of 1.08 Umg[superscript -1] Four methods of cell disruption were evaluated for release of intracellular glucose oxidase from P. canescens Tt42 cells. These methods were; sonication, French press, Freeze-Thaw and a high pressure cell disrupter (Z-Plus Series) from Constant systems. All the methods were successful in releasing the intracellular glucose oxidase from P. canescens Tt42. The use of the Constant Systems high pressure cell disrupter was preferred, since it was the simplest and most rapid method. Ammonium sulphate precipitation was shown to be effective as an initial purification step for extracellular glucose oxidase from P. canescens Tt42. Comparison of the intra- and extracellular glucose oxidase fractions using isoelectric focusing showed 2 isoenzymes in both fractions. The pI values of the isoenzymes were determined to be 4.30 and 4.67, with the former being dominant. Since both the intra- and extracellular fractions contained the same isoenzymes of glucose oxidase, further purification studies were performed using the extracellular fraction. The glucose oxidase from P. canescens Tt42 was purified using 3 main techniques: ammonium sulphate precipitation (60% - 70% cut), anion exchange chromatography (Super Q 650M) and size exclusion chromatography (Sephadex S200HR). The glucose oxidase was determined to be ±80% pure by size exclusion chromatography. The final purified glucose oxidase was lyophilised, and an overall purification yield of 10.3% was achieved with an 8.6-fold purification. The purified glucose oxidase was confirmed to be catalase free. Glucose oxidase from P. canescens Tt42 was determined to be a dimeric protein (M[subscript r] ±148kDa) likely consisting of 2 equal subunits (M[subscript r] ± 70kDa). The temperature optimum range was shown to be 25-30°C. The optimum pH for the oxidation of β-D-glucose was pH 7. The enzyme was shown to be stable at 25°C for 10 hours, with a half life of approximately 30 minutes at 37°C. The lyophilised enzyme was stable at -20°C for 6 months. The properties of glucose oxidase from Tt42 were comparable to alternative glucose oxidase enzymes from Aspergillus and other Penicillium species. Glucose oxidase from P. canescens Tt42 was shown to have distinct kinetic characteristics. The V[subscript max] and K[subscript m] were shown to be 651 Umg[superscript -1] and 18.4 mM towards β-D-glucose. The catalytic kcat and specificity k[subscript cat]/K[subscript m] constants for glucose oxidase from P. canescens Tt42 were shown to be 791 s[superscript -1] and 40 s[superscript -1]mM[superscript -1] each respectively. The specificity constant (k[subscript cat]/K[subscript m]) of glucose oxidase from P. canescens Tt42 was determined to be 1.3-fold higher than that that of A. niger (Sigma Type VII) and 8.7-fold lower than that of P. amagasakiense (ATCC 28686) from literature.
- Full Text:
- Date Issued: 2006
Expanding the capabilities of the DPS lonosonde system
- Authors: Magnus, Lindsay Gerald
- Date: 2001
- Subjects: Ionosondes
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5560 , http://hdl.handle.net/10962/d1018243
- Description: The Digisonde Portable Sounder (DPS) is a low power pulse ionosonde capable of recording a wealth of scientific information about the ionosphere. The routine vertical incidence mode, that produces the scaled ionospheric parameters, only records limited Doppler and no precise angle of arrival (AoA) information. The drift mode produces precise scientific information but only limited range information. This thesis explains the operation of the DPS and then examines the drift data by first showing the Doppler velocities (V*) calculated for a fixed frequency ionogram as well as the velocities calculated from an interesting ionospheric disturbance measured with a stepped frequency ionogram and second by illustrating the presence of a variation in the AoA of ionospheric echoes at sunrise. The conclusion of the thesis is that a drift vertical incidence mode be developed to allow the simultaneous measurement of the scaled ionospheric parameters and the precise AoA and full Doppler spectrum information.
- Full Text:
- Date Issued: 2001
Death, immortality & the biblical doctrine of resurrection : a study in the theology of renewal
- Authors: Bank, Louis
- Date: 1962
- Subjects: Jesus Christ -- Resurrection , Resurrection -- Biblical teaching , Church renewal
- Language: English
- Type: Thesis , Bachelor , BDiv
- Identifier: vital:1280 , http://hdl.handle.net/10962/d1013448
- Description: From Introduction: The fact of the resurrection of Jesus Christ, the Son of God, from the dead is the central fact of Christian faith and teaching. This centrality is certainly accorded it in the Bible, but has often been forgotten in the thinking, practice and worship of the Christian Church. (The paucity of available contemporary literature on the subject is one fact which may serve to illustrate this.) The subject of the first Christian sermon preached on the Day of Pentecost was on the Resurrection. The Jesus whom they had crucified, God had made both Lord and Christ. (Acts 2. 37.) The Gospels would belie their name if they had left us with an account of the life and tragic death of a man who claimed to know and reveal God in a special way. The news is good news precisely because of the Resurrection of our Lord from the dead.
- Full Text:
- Date Issued: 1962