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.
Results
Showing 1 to 20 of 36 for “"St Helena Bay"”.
-
The variability of retention in St Helena Bay
The circulation in St Helena Bay and the variability of the retention of the Bay are investigated using seasonal climatologies of the Regional Ocean Modelling System (ROMS). While retention has been studied biologically, the seasonality of the hydrodynamics contributing to the retention have …
-
Labour, capital and the state in the St. Helena Bay fisheries c.1856 - c.1956
This thesis deals with the history of the St Helena Bay inshore fisheries, 1856-1956. Fishing has long been neglected by social and economic historians and the myths propagated by company and popular writers still hold sway. The thesis challenges these by situating commercial fishing at St Helena …
-
Temporal and spatial variability in a copepod community off St Helena Bay in 2000/1
… forces behind changes in copepod community structure in the Benguela upwelling region are examined. For this study, monthly changes in copepod size structure and species composition were examined at St Helena Bay in 2000/1 in relation to upwelling, phytoplankton and fish. The copepod …
-
An ethnography of St Helena Bay - A West Coast Town in the age of neoliberalism
… of interaction between social and ecological systems as they manifest locally in St Helena Bay. The growing integration of the West Coast has brought rapid change in the form of industrial production, urban development and in-migration. The pressure placed on local resources by these processes …
-
Seasonal and spatial variability of pelagic fishes in relation to environmental variability in St Helena Bay
The St Helena Bay Monitoring Line (SHBML) stretches 197 nautical miles off Elands Bay on the west coast of South Africa. It is an extensive long term project on environmental monitoring, running from 2000 till 2012 on an almost monthly basis but currently running on a quarterly basis. It extends …
-
Spatial and temporal scales of the coastal currents in the St. Helena Bay - Cape Columbine Region
… of a current meter experiment performed in the St Helena Bay - Cape Columbine region during winter 1982. The work, which forms part of the shelf dynamics programme undertaken by the Sea Fisheries Research Institute, attempts to identify the important time and spatial scales within the coastal …
-
Are distinct particle spectra an indication of the state of the phytoplankton community in St Helena Bay?
… fish recruits in the Southern Benguela was investigated. Phytoplankton samples collected on regular cruises on the St Helena Bay Monitoring Line (SHBML) off Elands Bay on the west coast of South Africa had been analysed with the Coulter Counter and formed the basis of this study. Chlorophyll a …
-
Spatial and temporal distribution of a marine microbial parasite, Syndiniales MALV I and II, within St Helena Bay
MALV I and II are globally distributed marine microbial parasites that infect and kill a wide range of phytoplankton hosts. These organisms play an important role in bloom dynamics, are suspected to terminate algal blooms, and contribute significantly to carbon fluxes, an important process required …
-
Belonging to the West Coast : an ethnography of St Helena Bay in the context of marine resource scarcity
… of interaction between social and ecological systems as they manifest locally in St Helena Bay. The growing integration of the West Coast has brought rapid change in the form of industrial production, urban development and in-migration. The pressure placed on local resources by these processes …
-
The role of women in the small-scale fishery sector in South Africa: the case of St Helena Bay
Small-scale fisheries are a cornerstone of coastal livelihoods, food security, and cultural heritage worldwide, supporting millions of people and contributing significantly to global fish production. These fisheries are inherently diverse, involving a wide range of activities from harvesting and …
-
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
… to dinoflagellate species, occur along the west coast of South Africa, particularly during the latter 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. …
-
A comparative study of nitrogen uptake and nitrification rates in sub-tropical, polar and upwelling waters
… oxidation of ammonium to nitrate through a two step biological process. Nitrification in the euphotic zone has, in the past, been considered negligible even though quantifying this process correctly is important when linking carbon export to nitrate uptake by phytoplankton. However, studies of …
-
Feeding habits of sardine (Sardinops sagax) in relation to their spawning activities
… activity of sardine (Sardinops sagax) from St Helena Bay and Gans Bay in the Southern Benguela was studied between February and April 2011 and related to reproduction. Feeding intensity of 373 sardine was calculated and correlated with caudal length across different gonad maturity and fat …
-
Feeding habits of sardine (Sardinops sagax) in relation to their spawning activities
… activity of sardine (Sardinops sagax) from St Helena Bay and Gans Bay in the Southern Benguela was studied between February and April 2011 and related to reproduction. Feeding intensity of 373 sardine was calculated and correlated with caudal length across different gonad maturity and fat …
-
Influences on the hydrology of the Cape Columbine/St. Helena region
The overall objective of the thesis is to investigate and interpret hydrological events occurring at the Cape Columbine upwelling site and the adjacent coastal waters, with special reference to St. Helena Bay. The first step in the study involves monitoring the meteorological occurrences which …
-
Investigation of the nearshore, episodic poleward current in the southern Benguela : a numerical modelling approach
… great economic importance on the South African West Coast (the Southern Benguela). The St Helena Bay region is a key nursery habitat for these fisheries because of its retention, upwelling and stratified water column characteristics. However, these characteristics also result in other outcomes …
-
Distribution and population dynamics of Euphausia lucens (Euphausiacea) in the southern Benguela current
The thesis first reviews 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, …
-
Seasonality of the marine carbonate system in the southern Benguela nutrient stoichiometry, alkalinity production, and CO flux
An observational study was undertaken to determine the seasonality of the marine carbonate system of the southern Benguela focusing on three key points: the processes driving bulk stoichiometry, alkalinity production on the continental shelf, and the air-sea flux of CO2. Monthly samples were taken …
-
The variability of Lagrangian transport in the southern Benguela Current upwelling system
This study analyses the physical mechanisms that impact Lagrangian 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 …
-
The influence of the land-sea breeze on coastal upwelling systems
… the physical and biogeochemical functioning of eastern boundary upwelling systems (EBUS) is often over-looked. Here, we present a series of 1D, 2D, and 3D numerical experiments which elucidate the drivers of diurnal-inertial variability and vertical mixing in EBUS due to land-sea breeze forcing …
Page 1 of 2