Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Benguela Current"”.
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Phytoplankton growth and zooplankton grazing in the southern Benguela current
… mesozooupwelled waters of the southern Benguela Current by means of an electronic counting and sizing technique (Coulter counter). A feasibility study was initiated to test the accuracy of the Coulter counter (Model TAII) in estimating phytoplankton size and biomass in fresh and …
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Egg cannibalism by anchovy in the Southern Benguela Current Region
Samples of adult anchovy and plankton were collected on Sea Fisheries Research Institute R.S. Africana 1984-1985 anchovy spawner biomass estimation cruises. A total of 40 sets of anchovy samples of 30 fish each and 40 plankton samples were taken roughly at the same time within an area of intensive …
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Fish spawning strategies in the variable southern Benguela Current region
… surveyed at monthly intervals in the southern Benguela. Current system between August 1977 and August 1978. Plankton was collected at each station by means of a double oblique tow behind the ship at 2 knots down to 100m or 5m off the bottom. Plankton displaced volume was determined and all fish …
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Coastal climate change and variability in the Benguela current system
… long-term change and decadal variability in the Benguela Upwelling System and study the possible mechanisms behind these changes. The Benguela Upwelling System is one of the four most productive fisheries areas in the world, and it is therefore important to understand the mechanisms leading to …
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Phytoplankton physiology in a nearshore region of the southern Benguela current
During the summer of 1978-79 diatoms dominated the communities from October to January but microflagellates were dominant in February and March. Low concentrations of ATP, chlorophyll a protein and carbohydrate were measured in Type 1 water with protein/carbohydrate ratios being )1. In Type 2 water …
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The Cape fur seal : monitoring and management in the Benguela Current ecosystem
At the root of this thesis was the Benguela Current Large Marine Ecosystem (BCLME) Programme’s project "Top Predators as Biological Indicators of Ecosystem Change in the BCLME" (LMR/EAF/03/02). The objectives of this project were to assess the utility of top predators as biological indicators of …
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The variability of Lagrangian transport in the southern Benguela Current upwelling system
… pathways and transport in the southern Benguela upwelling system (SBUS),an environment in which currents are key components of many important ecological processes, including the dispersal of marine larvae. Physical advection by currents is an important mechanism for egg and larvae …
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Distribution and population dynamics of Euphausia lucens (Euphausiacea) in the southern Benguela current
… the research on zooplankton ecology in the Benguela system and then evaluates the contribution of euphausiids to the zooplankton biomass of the southern Benguela region. The study further investigates the population dynamics and maintenance of the dominant euphausiid, Euphausia lucens, …
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Taxonomy, distribution and toxicity of dinoflagellate species in the southern Benguela current, South Africa
… their attendant problems, exists throughout the Benguela region. In the southern Benguela upwelling system, water discolorations, referred to as 'red tides', are common and usually attributed to dinoflagellate species. The first aim of the thesis was to investigate the taxonomy of gymnodinioid …
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Ecosystem effects of bottom trawling in the Benguela current system : experimental and retrospective data analyses
This thesis investigates ecosystem effects of bottom-trawling on demersal fish assemblages (1990-2006) off Namibia and their relationship to environmental variables.
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Sea surface temperature trends around Southern Africa (focusing on the Benguela Current system and the Agulhas retroflection area)
… a good indicator for upwelling strength in the Benguela Current system and therefore is linked to bio logical activity in that region. SS T is an important driver of the air-sea exchange of moisture and energy, especially in the Agulhas Current where high latent and sensible heat fluxes occur. …
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The variability of retention in St Helena Bay
… how the sea temperature, atmospheric forcing and currents contribute to the seasonal recirculation dynamics in St Helena Bay. Ichthyop, a lagrangian particle tracking method is used to study the spatial variations of local retention rates, with the particles released from the Bay. The circulation …
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Carbon and nitrogen flux through the Cape rock lobster jasus lalandii (H. Milne Edwards), with particular reference to the nearshore Benguela system
… kelp-bed ecosystem under the influence of the Benguela current was explored and quantified.
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The circulation and thermal structure of False Bay: a process-oriented numerical modelling and observational study
… between two of the world's most in-fluential current systems: the Agulhas and Benguela Current Systems. False Bay is situated at a biogeographic break (Pitcher et al., 2010), belonging to both the South-ern Benguela upwelling system and the Western Agulhas Bank. The oceanography of Southern …
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Multi-sensor mooring development and its use to characterise physical processes relevant to harmful algal bloom dynamics in the St Helena Bay area, South Africa
… part of the upwelling season. As part of the Benguela Current Large Marine Ecosystem (BCLME) programme, a buoy has been developed locally for monitoring the development and occurrence of HABs. The mooring is situated three and a half kilometres offshore from Lambert's Bay, downstream from the …
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Implications of recruitment, distribution and availability of stocks for management of South Africa's Western Cape purse-seine fishery
… in the highly productive waters of the southern Benguela Current system (Cushing 1969). Management of the multi-species resource is the responsibility of the government's Department of Industries and since 1950 a large volume of data relating to performances of contributing species has been …
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Equilibrium dynamics of the Benguela system : a numerical modelling approach
… conditions and seasonal variations of the Benguela system, including both the large-scale flow regime as well as the coastal upswelling regime. A shelf-edge poleward flow exists in the northern Benguela region and is driven primarily by the wind-stress curl via the Sverdup relation. As …
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The biology, distribution and ecology of Lampanyctodes hectoris and Maurolicus muelleri along the South-African coast
… parameters. L. hectoris spawning in the southern Benguela Current System occurs throughout the year, but mainly during the late winter to early spring with a peak in spring. M. muelleri spawning occurs throughout the year with a peak in spring/early summer and a smaller peak in winter. Maturity …
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Wind shear and differential upwelling along the South Western tip of Africa
… winds accelerate over portions of the southern Benguela current region through deflections forced by three pronounced capes, two with mountain ridges exceeding 1000 m. Selected case studies are utilized to contrast the characteristics of deep and shallow wind flow, and the exposed and sheltered …
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Challenges facing implementation of the precautionary principle in Namibian marine phosphate mining regulation
… Ministry of Mines and Energy in July 2011, The Benguela Commission’s (Commission) mandate to protect and sustain the marine ecosystem is being tested.1 The interest shown by prospectors of Namibia’s continental shelf is confirmation of its potential mineral reserves. In this regard, advances in …
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