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Dissertations / Theses on the topic 'Marine metabolites – South Africa'

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Published: 4 June 2021

Last updated: 15 February 2022

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1

Antunes, Edith Martins. "Pyrroloiminoquinone metabolites from South African Latrunculid sponges." Thesis, Rhodes University, 2003. http://eprints.ru.ac.za/215/.

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2

Bromley, Candice Leigh. "Studies in South African marine molluscan chemistry." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1005021.

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This thesis investigates the variability occurring in the secondary metabolites produced by three South African marine molluscs. Chapter Two discusses the isolation and spectroscopic structure elucidation of the metabolites isolated from two Siphonaria species. The re-investigation of Siphonaria capensis yielded siphonarienfuranone (2.2) as the only common polypropionate isolated from both the 1998 and 2009 collections of S. capensis from the same areas suggesting possible seasonal or genetic variation in polypropionate production. The sterol cholest-7-en-3,5,7- triol (2.33) was also isolated

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3

Hooper, Gregory John. "Biologically active natural products from South African marine invertebrates." Thesis, Rhodes University, 1997. http://hdl.handle.net/10962/d1003239.

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This thesis describes the chemical and biological investigation of the extracts of six different marine invertebrate organisms collected along the South African coastline. The work on these extracts has resulted in the isolation and structural elucidation of twenty-one previously undescribed secondary metabolites; The history of marine natural product chemistry in South Africa has not previously been reviewed and so a comprehensive review covering the literature from the 1940's up until the end of 1995 is presented here. The marine ascidian Pseudodistoma species collected in the Tsitsikamma Ma

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4

Beukes, Denzil Ronwynne. "Structural and synthetic investigations of South African marine natural products." Thesis, Rhodes University, 2000. http://hdl.handle.net/10962/d1005015.

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A chemical investigation of six different marine invertebrates, collected along the South African coastline, resulted in the isolation and structural elucidation of fifteen previously undescribed secondary metabolites along with seven known compounds. The structures of the new metabolites were determined by a combination of spectroscopic and chemical methods. The endemic false limpet Siphonaria capensis was shown to contain two unusual polypropionate metabolites capensinone (162) and capensifuranone (163) as well as 2,4,6,8-tetramethyl-2-undecenoic acid (164) and the known polypropionates (E)-

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5

Afolayan, Anthonia Folake. "Isolation and characterization of antiplasmodial metabolites from South African marine alga." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1003063.

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Malaria is one of the three most deadly diseases in Africa. Although there are available treatments, their efficacy has been greatly reduced over the past two decades due to the development of resistance to currently available drugs. This has necessitated the search for new and effective antimalarial agents. This project approached the search for new antimalarial compounds in two ways: (i) by screening natural products isolated from marine algae against the Plasmodium parasite and (ii) by modification of selected isolated active compounds to target 1-deoxY-đ-xylulose 5-phosphate reductoisomera

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Fakee, Jameel. "The isolation and characterisation of secondary metabolites from selected South African marine red algae (Rhodophyta)." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001472.

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Secondary metabolites from natural sources are fast growing as popular drug leads. The structural novelty and favourable biological activity that these compounds display contribute to their popularity as drugs of the future. Examples of such compounds include the potent anticancer drug paclitaxel isolated from the bark of a yew tree as well as the more commonly known analgesic aspirin which stems from the bark of the willow tree. The biological activities exhibited by these secondary metabolites are vast and range from antimicrobial to anticancer activity to mention but a few. As a result, the

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7

Pather, Simisha. "Marine biotechnology : evaluation and development of methods for the discovery of natural products from fungi." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1007652.

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One of the major impediments in the development of marine natural products is the provision of biologically active natural products in sufficient quantity for complete pharmacological evaluation, clinical trials and eventual commercial production. Marine microorganisms show great promise in providing a renewable source of biologically active natural products. The main aim of this study was to develop and evaluate methods for the isolation, identification and cultivation of marine fungi from the South African marine environment for the production of biologically active secondary metabolites. Tw

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8

Walmsley, Tara Aisling. "An investigation into the bacterial diversity associated with South African latrunculid sponges that produce bioactive secondary metabolites." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1012943.

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Algoa Bay Latrunculid sponges are well known for their production of cytotoxic pyrroloiminoquinones with speculation that these secondary metabolites may have a microbial origin. This study describes a thorough investigation into the bacterial community associated with Tsitsikamma favus, Tsitsikamma scurra a newly described Latrunculia sp. and a yellow encrusting sponge associated with T. scurra. Molecular and chemical characterisation were used in conjunction with traditional taxonomy in identification of the sponge specimens. The 28S rRNA and COX1 analysis confirmed the traditional taxonomy

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9

Bromley, Candice Leigh. "The chemistry of Algoa Bay ascidians." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/d1020606.

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This thesis investigates the chemistry of 25 ascidian species collected from Algoa Bay, South Africa with a concerted focus on metal accumulation by these ascidians and the possible interaction of these metals with ascidian metabolites. Chapter 2 details the screening techniques employed to establish the presence of nitrogenous metabolites (1H- 15N HMBC), hyper-accumulated metal ions (ICP-MS) and potential metal ion/ ascidian metabolite complexes (LC-ICP-MS/ESI-MS). Unfortunately, exhaustive attempts to detect intact metal ion/ascidian metabolite complexes through the use of liquid chromatogra

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10

Newdigate, James. "Salvaging historic shipwrecks in South Africa." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/4490.

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Includes bibliographical references<br>The mystique surrounding shipwrecks has intrigued man since the inception of sea travel itself. The wreck lies as a submerged time capsule, holding secrets of the past, patiently waiting to tell her stories, with rich rewards for archaeologists and salvors alike. Modern advances in underwater technology have supported a drastic increase in the discovery and retrieval of shipwrecks and their cargoes. Accompanying such advances are tensions which have emerged between interested parties in historic wrecks, the most notorious being between two broad interest

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11

Cawthra, Hayley Candice. "The marine geology of Mossel Bay, South Africa." Doctoral thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/8697.

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Includes bibliographical references.<br>This thesis presents work undertaken to better understand the complex evolution of the terrestrial landscape now submerged by high sea levels offshore of Mossel Bay along the South Coast of South Africa. Three marine geophysical surveys and scuba diving were used to examine evidence of past sea-level fluctuations and interpret geological deposits on the seafloor. Additional geological mapping of coastal outcrops was carried out to link land and sea features and rock samples were dated using Optically Stimulated Luminescence (OSL). Geophysical investigati

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12

Mbane, Nontuthuzelo Nosisa. "The South African marine fisheries policy since 1994." Thesis, Cape Technikon, 2004. http://hdl.handle.net/20.500.11838/1664.

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Dissertation (MTech( Public Management))--Cape Technikon, Cape Town, 2004<br>Marine resources play a major role in sustaining the economy and social development of the nation and contribute to national economy, to employment and security of the local community. The South African fisheries management was conducted largel)' with political default. This denied most fishers access to marine resources. Since the democratic election of 1994, the government was left with the challenge to re-allocate rights in a way that would ensure that the under-presentation of historical disadvantaged individ

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13

McMurray, Helen F., and Helen F. McMurray. "Phytoplankton production in Agulhas bank waters (South Africa)." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/23663.

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Carbon-14 measurements of community and size- fractionated production in continental shelf waters of the Agulhas Bank (South Africa) are presented. Auxiliary measurements included chlorophyll α, nitrate concentrations and thermal profiling of the water column. During the winter and spring surveys, the mixed layer extended deeper than the euphotic zone, with nitrate and phytoplankton biomass being evenly distributed through the euphotic zone. Production maxima occurred at the 40 - 90 % surface irradiance light depths, with some evidence of surface photoinhibition. All surveys during summer mont

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14

Robinson, Tamara Bridgett. "Marine alien species of South Africa : threats and opportunities." Doctoral thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/6705.

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Until recently, marine bioinvasions have received little attention in South Africa, and the status of intertidal marine aliens was last assessed in 1990. I thus investigated the present distribution and status of three intertidal alien species (Mytilus galloprovineialis, Care in us maenas and Careinus aestuarii) and documented the presence and status of a previously unknown invasive, the Japanese oyster, Crassostrea gigas. M galloprovincialis was recorded along the entire west coast of South Africa, with populations extending up to central Namibia, and along the south coast of South Africa to

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15

Gon, O. (Ofer) 1949. "The history of marine fish systematics in South Africa." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1007800.

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South African marine fish collections and systematic research are relatively young, essentially a product of the 20th century. Their history in South Africa comprises three distinct periods: the emergence of fish collections (before 1895), the beginning of research (1895-1945) and modern research (1945-1999). From the outset of their arrival in South Africa in the mid-17th century, the European settlers of the Cape Colony supplemented their diet with fishes. Therefore it is not surprising that when natural history museums appeared in the 19th century fishes were among the first specimens they

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16

Green, Stewart Christopher. "The regulation of sand mining in South Africa." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/4475.

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Includes abstract.<br>Includes bibliographical references.<br>Sand, an important input to the construction industry, is extensively mined from the environment leading to depletion of the resource as well as damage to riparian habitat and the alteration of river beds and banks. Sand mining in South Africa is controlled by a complex regulatory system that can be distilled into three main themes: mineral regulation; environmental regulation; and land use planning regulation. In this thesis, it is hypothesised that sand mining is subject to all three regulatory themes equally. In practice, however

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17

Meierhofer, Sophie Elizabeth. "White shark cage diving in South Africa: a critical assessment of South Africa's regulatory framework." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25050.

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'White Shark Cage Diving' (WSCD) enables tourists to experience a face-to-face encounter with wild sharks in the open water. In order to attract the animals close to the cages, tour operators often use chum, bait, or decoys, which interferes with the natural habits of marine wildlife. These practices have great potential to adversely impact animals and the marine environment, with unknown long-term consequences. Globally, South Africa has the most extensive WSCD industry. The management is based on a policy paper and regulations published in 2008 by the Minister of Environmental Affairs (a min

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18

Rapson, Trevor Douglas. "Bioactive 4-methoxypyrrolic natural products from two South African marine invertebrates." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1006766.

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This thesis presents an investigation of the 4-methoxypyrrolic constituents of two South African marine invertebrates, the nudibranch Tambja capensis and the bryozoan Bugula dentata. Three known compounds tambjamine A (7), tambjamine E (13) and the tetrapyrrole (15) were isolated during this investigation. All three compounds were shown to be active against oesophageal cancer in accordance with the general anticancer and immunosuppressive properties observed for 4-methoxypyrrolic natural products. Tambjamine A (7), tambjamine E (13) and the tetrapyrrole (15), together with tambjamine K (21) an

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19

Lamberth, Stephen Justin. "The commercial beach-seine fishery in False Bay, South Africa." Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/16997.

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Bibliography: pages 108-123.<br>This study was initiated in response to allegations by the conservation lobby that the commercial beach-seine fishery in False Bay was jeopardizing fish stocks and detrimentally affecting the ecology of the Bay. Its main aims were to quantify the current catch and place it in an historical perspective, to describe seasonal patterns in catches and effort and to assess the impacts of netting on juvenile fish and benthic organisms. The overall objective was to provide a "scientific" basis for the resolution of the controversy surrounding this fishery.

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20

Watson, Ralph Gareth Andrew. "Baited remote underwater survey of chondrichthyans in False Bay, South Africa." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/14022.

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Worldwide, numerous shark populations are in rapid decline due to chronic overfishing. Their slow reproductive capacity make them susceptible to extinction. To monitor the status of chondrichthyan species, the method or combination of methods used should be non-selective, applicable in a variety of habitats and under most environmental conditions. Baited Remote Underwater Video (BRUV) surveys have shown major benefits over traditional capture-based survey methods in multiple areas. They have been shown to be non-extractive, causing no major disturbance to the substrata and its epibenthos. Larg

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Simmons, Aron. "Assessment of a pond for oyster hatchery development in South Africa." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15723.

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This study assessed a man-made salt-water pond (saltwater pond 1 SP1) as a potential site for the development of an oyster hatchery in Velddrif, South Africa. Over the study period it was observed that the site was not suitable for oyster larvae culture due to the following factors: temperature spikes during the summer months, low dissolved oxygen levels, high salinity levels, and the proliferation of the filamentous green algae (FGA), mainly the sp. Rhizoclonium implexum. Widespread patches of R. implexum were observed within SP1 and increased in biomass over the study period. Biomass pattern

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Innes, Sheona. "Tropical intertidal seaweed turf communities of Jesser Point, Sodwana Bay, South Africa." Bachelor's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/26378.

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Algal turfs play an important role in both tropical and temperate reef ecology, supporting a diverse array of macrofauna as well as being primary producers within both intertidal and subtidal ecosystems. Biodiversity and biomass patterns of the intertidal algal turfs at Sodwana Bay, South Africa have not yet been established so this study was undertaken to investigate these. It was hypothesised that both biodiversity and biomass would decrease with increasing height along the shore, as well as that sediment would have an effect on the community composition of the turfs. The community was sampl

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23

Steyn, Paul-Pierre. "The ecophysiology of Gelidium Pristoides (Turner) Kuetzing : towards commercial cultivation." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1117.

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The ecophysiology of the red alga Gelidium pristoides (Turner) Kuetzing was investigated in an effort to establish a technique for commercial cultivation. The seaweed is of commercial importance in South Africa where it is harvested from the intertidal zone rocky shores along the coast. It is dried and exported abroad for the extraction of agar. Yields and quality could be improved by cultivation in commercial systems. However, attempts at growing the seaweed in experimental systems have all ended in failure. This study aimed to describe the conditions in which the seaweed grows naturally; and

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24

Medd, Hannah B. "Predicting South Africa 's true marine biodiversity : a comparison of methods." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/6136.

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Word processed copy.<br>Includes bibliographical references (p. 80-89).<br>The aims of this thesis are to estimate how many marine species remain to be described in this region and which areas are most in need of additional sampling effort.

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January, Grant Garren. "Bioprospecting for bioactive polysaccharides from marine algae endemic to South Africa." University of the Western Cape, 2016. http://hdl.handle.net/11394/5322.

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>Magister Scientiae - MSc<br>Fucoidan is a marine-derived sulphated polysaccharide with bioactive properties ideal for the food, chemical and pharmaceutical industries. The polysaccharide consists largely of L-fucose, has a highly heterogeneous structure and is of diverse origin. Fucoidan was extracted from Ecklonia maxima, Laminaria pallida and Splachnidium rugosum and the effect of different extraction methods on fucoidan heterogeneity was assessed. Extraction methods employed hot water, hydrochloric acid or calcium chloride salt. Fucoidan yield and purity were determined by various colorime

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Ndhlovu, Rachel Tintswalo. "Temporal variability in the fatty acid composition of suspension-feeders and grazers on a South African rocky shore." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1020879.

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Numerous ecological studies have used lipids to determine trophic pathways in aquatic systems, as fatty acid profiles provide time-integrated information on an organism’s assimilated diet. Many of these studies have, however, been based on sample collections with a limited temporal scale. The trophic ecology of pelagic systems has been studied intensively using fatty acid analyses, but very little work has been directed toward benthic communities, with the intertidal being especially neglected. The investigation of trophic pathways within rocky shore communities will help us to better understa

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Nibam, Abi Henry. "Reproductive biology and diet of the St. Joseph (Callorhinchus capensis) in South Africa." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10791.

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Includes abstract.<br>Includes bibliographical references (p. 72-84).<br>The reproductive biology of the commercially exploited fish St. Joseph or Cape Elephant fish Callorhinchus capensis, is described based on 173 fishes caught by gillnets in October 2010 from Velddrif along the west coast of South Africa. Segregation by sex was reflected by a difference in sex ratio from 1:1 for females to males fishes collected from the fishery (?2 = 16.23, d.f. = 1, p = 5.6 x 10-5).

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Van, Zyl Frederik Wilhelm. "Geological mapping of the inner shelf off Cape Town's Atlantic Seaboard, South Africa." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29676.

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The Atlantic Seaboard is an 18 km stretch of coastline located on the Cape Peninsula, South Africa, roughly between the Cape Town suburbs of Mouille Point in the north and Hout Bay in the south. It borders heavy shipping traffic and contains a mix of urban and natural environments including up-market seaside neighbourhoods and is part of the Table Mountain National Park. The predominantly rocky coastline has a northeast–southwest orientation with interspersed sandy pocket beaches. A narrow, low-lying coastal plain (marine terrace) in the north merges with coastal cliffs further south. The geom

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Lenhoff, Louis. "The marine geology of Walker Bay, off Hermanus, SW Cape, South Africa." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/22397.

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Bibliography: pages 55-58.<br>The seafloor geology of Walker Bay on the southern Cape coastline is described by making use of geophysical information obtained over a period of 4 years, between 1986 and 1990. The data include side-scan sonar images, seismic profiles, seabed samples and observations by a Remotely Operated underwater Vehicle (ROV). Four sonograph facies were identified, based on their distinctly different reflectivity patterns. Using the seabed samples and R.O.V. observations, the physical characteristics of these facies are determined and presented in map format. Facies 1 consis

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Begley, Paul. "The El Niño - Southern Oscillation, rainfall and wheat yields in South Africa." Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/19916.

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This thesis assesses the relationships between the El Niño-Southern Oscillation (ENSO), rainfall and South African commercial winter wheat yields from 1974 - 2000. The analysis is through a combination of the Pearson's product moment correlation coefficient and an assessment of the magnitude and consistency of rainfall and wheat anomalies in the year of, and the year following warm (El Niño) and cold (La Niña) ENSO events. The ENSO - rainfall relationship is analysed on timescales from 1 - 24 months and this study finds that there are more unusually dry and unusually wet months during El Niño

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Kemp, Lucy Valeska. "Ancient stonewall fish traps on the south coast of South Africa : documentation, current use, ecological effects and management implications." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/6485.

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Includes bibliographical references (leaves 48-54).<br>Ancient intertidal stonewall fish traps are found world-wide and those along the SouthAfrican south coast are the focus of my thesis. These fish traps, known locally as 'vywers', have recently enjoyed much media attention as interest increases in both South Africa's cultural heritage and its diminishing fish stocks. Two pioneering studies, by Goodwin (1946) and Avery (1975), provided the only documented knowledge of these vywers. My study aimed to locate, survey and document the main concentrations of vywers within a 300-km stretch along

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Kerwath, Sven Ebo. "Empirical studies of fish movement behaviour and their application in spatially explicit models for marine conservation." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005121.

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This thesis investigates the movement behaviour of South African two coastal fish species and evaluates the effectiveness of marine protected areas (MPAs) in their protection and management. Its primary focus is on resolving the movement patterns of roman Chrysoblephus laticeps (Sparidae) in and around the Goukamma and Castle Rock MPAs in the Western Cape province of South Africa. A pilot study of the methodology investigated the movement behaviour of spotted grunter Pomadasys commersonnii (Haemulidae) in the sheltered East Kleinmonde Estuary in the Eastern Cape province. The application of di

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Nakin, Motebang Dominic Vincent. "Effects of marine reserves on the biology of rocky intertidal limpets along the southern coast of South Africa." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005365.

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Limpets are harvested by people in South Africa, but are selected in terms of species and size. The effects of marine reserves on the biology of commonly exploited (Helcion concolor and Scutellastra longicosta) and rarely exploited species (Cellana capensis and Scutellastra granularis) were investigated on the southeast coast of South Africa at two reserve and two non-reserve sites. For each species, a 4-way nested ANOVA was used to test the effects of month, reserve, site (nested within reserve) and area (nested within site and reserve) on population density, size structure and recruitment of

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Mollatt, David G. R. "Examining the feasibility of introducing environmental surcharges to finance local coastal management initiatives in South Africa : a case study in Plettenberg Bay." Thesis, Rhodes University, 2004. http://hdl.handle.net/10962/d1002734.

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The management of coastal resources in South Africa has come under review as a result of the degradation of environmental resources along the coast. The challenge being faced by resource managers is to achieve economic growth while sustaining South Africa’s coastal resource base (Nobel, 2000). The South African government (RSA, 2000) has developed a coastal management strategy to meet this challenge: The strategy involves the inclusion of all stakeholders in the formation of policy regarding the management of coastal resources, in a more integrated approach to coastal management. To effectivel

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Götz, Albrecht. "Assessment of the effect of Goukamma Marine Protected Area on community structure and fishery dynamics." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005073.

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This study presents a detailed investigation into size, density and community structure of temperate marine reef fish in the medium-sized Goukamma Marine Protected Area (Goukamma MPA) and adjacent fishing grounds on the south coast of South Africa. The oceanographic conditions, the spatial distribution of the benthic community and the prevailing fishing effort are also described. Life history traits and per-recruit (PR) models for the principle target species, roman (Crysoblephus laticeps) are compared between the protected and exploited area. From the study results, various strategies are pro

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Gray, Christopher Anthony. "Structural and synthetic investigations of diterpenoid natural products from southern African marine invertebrates." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1005014.

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This thesis is divided into two parts. The first part (Chapter Two) documents a bioassay guided investigation of the ethyl acetate extracts of four marine invertebrates from Mozambique (an Irciniid sponge, a Haliclona sp. sponge, an ascidian tentatively identified as Diplosoma sp., and the soft coral Cladiella kashmani). Eight known compounds [ilimaquinone (2.1), renierone (2.7), N-formyl-1,2-dihydrorenierone (2.8), 1,6-dimethyl-7-methoxy-5,8-dihydroisoquinoline-5,8-dione (2.9), mimosamycin (2.10) 7Z-allylidene-5-hydroxy-7,7a-dihydro-2H-cyclopenta[b]pyran-6-one (2.11), flaccidoxide (2.18) and

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Wilby, Deborah. "Shallow subtidal seaweed communities of the Agulhas Marine Province of South Africa." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/9274.

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Includes bibliographical references (leaves 84-92).<br>Several aspects of seaweed ecology are poorly studied and documented in South Africa, especially the subtidal algal communities along the south coast. This study aims to investigate these communities where few other studies have been conducted. Sampling of shallow subtidal seaweed communities was undertaken at eleven sites along the south coast of South Africa from Still Bay to Mzamba. At each site a number of quadrats were placed within the shallow subtidal zone ranging in depth from O.3m to 2.5m. Within these quadrats all algae were dest

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Levy, David. "The environmental factors determining temporal distributions of cetaceans in Mossel Bay, South Africa." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25346.

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A variety of cetacean species make use of the bays along the South African coast for different purposes, including feeding, mating and calving. Sightings of five species of cetaceans were recorded from shore based locations between February 2010 and August 2014 in Mossel Bay, Western Cape. In this study, we aimed to examine the underlying environmental variables: sea surface temperature (°C), chlorophyll a concentration (mg.m-3) and moon brightness (as % of full) that potentially affect presence patterns within the bay, and several temporal scales (diurnal, monthly, seasonal, annual). The stud

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Van, Praag Alex. "Ectoparasites of the southern mullet Liza Richardsonii in the Berg Estuary, South Africa." Master's thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/6450.

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Includes bibliographical references.<br>The aims of this study were to observe changes in ectoparasite abundance and diversity on fish in relation to salinity gradients in the Berg Estuary. The host species studied was the commercially important, euryhaline southern mullet Liza richardsonii that is superabundant in estuaries of the Western Cape. A total of 210 fishes were sampled by using a single haul with a beach seine net at each of seven localities along a salinity gradient from the mouth to the upper reaches. Seven species of parasite were found. These included five species of Copepoda; a

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Bause, Mariëtte. "The challenge of applying systematic conservation planning to the marine environment using expert knowledge (focus: Sparidae)." Thesis, University of Port Elizabeth, 2004. http://hdl.handle.net/10948/343.

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Although the marine environment has generally been considered to be less in need of attention from conservationists, politicians and managers than the terrestrial environment, there has been an increasing appreciation that there is little left in the marine environment that can be considered unaltered by humans. Conservation action is therefore urgently needed to protect marine populations, species and environments from anthropogenic pressures. Since overharvesting seems to be the main cause of the collapse in coastal ecosystems, areas need to be protected so that stocks can recover. However,

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McPhail, Kerry Lee. "Extractives from six species of South African Marine Opisthobranch Molluscs." Thesis, Rhodes University, 2001. http://hdl.handle.net/10962/d1007412.

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The natural product chemistry of six species of South African opisthobranch molluscs and some of their dietary marine invertebrates was investigated. Nineteen previously undescribed secondary metabolites and twelve known compounds were isolated and their structures determined by a combination of spectroscopic and chemical methods. The circumtropical sea hares Aplysia parvula and A. dactylomela were found to contain halogenated red algal metabolites. 3Z-bromofucin (120), the Z analogue of a known Laurencia CIS acetogenin, was isolated from A. parvula. A. dactylomela yielded a series of novel no

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Tembo, Danai. "The disparities arising in the policing of consumptive and non-consumptive marine activities." Thesis, Nelson Mandela Metropolitan University, 2010. http://hdl.handle.net/10948/1383.

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The South African marine environment is utilised for both consumptive and non-consumptive activities and for those activities to continue sustainably it is important that these activities be monitored and policed. South Africa's environmental legislation is structured to do just that; outlining specific regulations for all consumptive and non-consumptive activities that can be conducted in the marine environment. Some disparities have been observed regarding the policing of consumptive and non-consumptive marine activities, and these disparities were analysed by means of several case studies a

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Naidoo, Ashley Desmond. "Ocean governance in South Africa: Policy and implementation." University of the Western Cape, 2020. http://hdl.handle.net/11394/7355.

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Philosophiae Doctor - PhD<br>Ocean Governance in South Africa has gained momentum over the last decade with the publication of the Green and White Papers on the National Environmental Management of the Ocean in 2012 and 2014, and the promulgation of the Marine Spatial Planning Act in 2019. Parallel to this South Africa developed and implemented the Operation Phakisa Ocean Economy Development Programme and declared a network of twenty Marine Protected Areas. The timing of this study over the last five years allowed the opportunity to undertake a detailed study of the Ocean Governance Pol

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Mmonwa, Lucas Kolobe. "Phylogeography and epifauna of two intertidal seaweeds on the coast of South Africa." Thesis, Rhodes University, 2009. http://eprints.ru.ac.za/1583/.

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Bernard, Anthony Thomas Firth. "Towards a cost-efficient & standardised monitoring protocol for subtidal reef fish in the Agulhas ecoregion of South Africa." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001674.

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Under the growing demand for marine fish resources, and the apparent and expected impacts of global climate change, there is a need to conduct long-term monitoring (LTM) to ensure effective management of resources and conservation of biodiversity. However LTM programmes often suffer from design deficiencies and fail to achieve their objectives. These deficiencies stem from the fact that insufficient consideration is afforded to the design phase, with programmes selecting methods that are not suitable to address the objectives, or are not cost-efficient, compromising the sustainability of the L

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Kwak, Gerrit Werner. "Developing marine pollution awareness among new recruits at SAS Saldanha Naval Gymnasium: a training needs analysis." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1003895.

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This dissertation focuses on the marine pollution awareness training needs of newly recruited SAN employees. It uses Training Needs Analysis (TNA) as a tool to gain a better understanding of what knowledge, skills and attitude (KSA) recruits should have about the marine environment and if their level of competency meets the requirement to effectively and efficiently contribute to the sustainable use of the maritime environment in which they will be deployed. Ultimately, their individual and collective abilities will be a determining factor in the strategic intent of the SAN to be unchallenged

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Springbok–Njokweni, Nosiphiwo. "Regional differentiation of three goatfishes (Parupeneus Spp.) within the Western Indian Ocean." Thesis, University of Fort Hare, 2015. http://hdl.handle.net/10353/d1020262.

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Goatfishes inhabit inshore reefs and corals and are commercially important across their distribution in the Western Indian Ocean (WIO). The biogeography of these species in the WIO has not been explored with regards to their levels of diversity and relationships among regions. The genetic connectivity and differentiation of three goatfishes of the genus Parupeneus (P. barberinus, P. macronemus and P. rubescens) was studied using two mitochondrial genes (ND2 and 16S rRNA) and one nuclear gene (RAG1) using specimens from East and southern Africa, islands around the Mascarene plateau, Oman, Maldi

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Grecula, Martin. "Stratigraphy and architecture of tectonically controlled turbidite systems : Laingsburg formation, Karoo Basin, South Africa." Thesis, University of Liverpool, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343590.

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Vorwerk, Paul D. "A preliminary examination of selected biological links between four Eastern Cape estuaries and the inshore marine environment." Thesis, Rhodes University, 2007. http://hdl.handle.net/10962/d1005434.

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The coastal transition zone (CTZ), which links the terrestrial and marine environments, has been identified as a region of high biological diversity and elevated production. Results of studies conducted in the northern hemisphere indicate that the links between estuaries and the adjacent marine environment is critical to ecological functioning within the CTZ. This study assessed the influence of selected estuaries with different hydrodynamic characteristics on the adjacent marine environment along the south-eastern coastline of southern Africa. Four estuaries were examined, including two perma

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Van, Niekerk Karen Loise. "Marine fish exploitation during the middle and later Stone Age of South Africa." Doctoral thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/12238.

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Includes abstract.<br>Includes bibliographical references (p. 298-335).<br>Marine fish remains are not common in Middle Stone Age (MSA) sites in Africa. There are currently only two known MSA sites with good organic preservation in South Africa that contain marine fish remains in relatively high numbers: Blombos Cave (BBC) and Klasies River main site (KR). Marine fish exploitation is considered by some researchers as a marker of modern human behaviour, requiring cognitive and technological capacities thought to have only appeared after 50 000 years ago, during the Later Stone Age (LSA).

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