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Showing 1 to 20 of 112 for “"Southern Benguela"”.
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Retention processes in the Southern Benguela upwelling system
The Benguela Upwelling System is one of four major Eastern Boundary Upwelling Systems (EBUS) in the global ocean. Here, equatorward winds drive the upwelling of cold, deep, nutrient-rich waters along the coast, which drives high levels of biological productivity. A consequence of this high …
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Bacterioplankton dynamics in the Southern Benguela upwelling region
The role of heterotrophic bacteria in the carbon and nitrogen flux of the pelagic food web was investigated during laboratory and field-based studies of the temporal development of the planktonic community after upwelling. Bacterial community structure, activity and production were closely coupled …
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Lateral carbon export from the southern Benguela upwelling system
… organic carbon from the continental shelf of the southern Benguela upwelling system to the open ocean. The flux is potentially important because the Benguela is one of the most productive and biogeochemically active ecosystems in the global ocean. Furthermore, a significant fraction of oceanic …
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Lateral carbon export from the southern Benguela upwelling system
… organic carbon from the continental shelf of the southern Benguela upwelling system to the open ocean. The flux is potentially important because the Benguela is one of the most productive and biogeochemically active ecosystems in the global ocean. Furthermore, a significant fraction of oceanic …
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Phytoplankton growth and zooplankton grazing in the southern Benguela current
… by herbivorous 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
… grid was 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 …
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Bio-optical investigation of phytoplankton production in the southern Benguela ecosystem
… existing models for the estimation of PP in the southern Benguela ecosystem, and to investigate the photophysiological responses of phytoplankton to changes in environmental conditions.
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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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Modelling regime shifts in the southern Benguela : a frame-based approach
… the most important small pelagic species in the southern Benguela ecosystem, which has been shown to have undergone regime shifts during the past 50 years. Modelling regime shifts at an ecosystem scale can be of great importance in fisheries management, to aid in long-term planning and fishing …
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Regional estimates of potential new production in the southern Benguela upwelling system
… range of the productive surface layer in the southern Benguela region. In this way it was possible to overcome the main shortcoming of passive satellite imagery by quantifying a sub-surface variable. The event-scale estimates of potential new production were extrapolated to the annual-scale by …
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The variability of Lagrangian transport in the southern Benguela Current upwelling system
… 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 currents is an important mechanism for egg and …
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A model of copepod population dynamics in the southern Benguela upwelling region
… egg abundance, survival and viability in the Southern Benguela system, were identified as the dominant impediment to attempts to simulate copepod population dynamics in the region. The Southern Benguela system is patchy on a range of different space and time scales. The effect of fine-scale …
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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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Modelling the spatial distribution of three marine fish species in the southern Benguela
Understanding the spatial distribution of species in relationship to climatic and environmental variables is key to conservation and management of important species, as their distribution might change under climate change and variability. Based on presence absence data from scientific trawl …
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Short-term dynamics of nano- and picoplankton in the southern Benguela upwelling system
Wind driven coastal upwelling influences the overall physical and chemical properties of coastal regions, as well as the small phytoplankton and microbial communities responsible for the productivity and biogeochemistry governing many of these properties. These environmental changes can influence …
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The development and decline of phytoplankton blooms in the southern Benguela upwelling region
… factor limiting primary production in the Benguela upwe!ling system. The temporal scale of phytoplankton bloom development was investigated in terms of changes in chlorophyll � concentrations in the euphotic zone. The build up and decline of the primary phytoplankton (diatom) bloom in newly …
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On-shelf nutrient trapping enhances the fertility of the southern Benguela upwelling system
The southern Benguela upwelling system (SBUS), located off the southwest coast of Africa, supports high rates of primary productivity that sustain important commercial fisheries. The exceptional fertility of this system is reportedly fuelled not only by upwelled nutrients, but also by nutrients …
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Hatchdate distributions and growth rates of anchovy (Engraulis encrasicolus) in the Southern Benguela ecosystem
… consecutive surveys in March and May 2000 in the southern Bengueia region off South Africa. Otoliths from sub-samples were examined to calculate hatchdate distributions and growth rates to estimate the main apparent spawning peaks of the 2000 year-class from both surveys, and to look for possible …
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