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Registros recuperados: 4
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Copepod production in the southern Benguela system OMA
Hutchings, L.; Verheye, H.M.; Mitchell-Innes, B.A.; Peterson, W.T.; Huggett, J.A.; Painting, S.J..
Several methods have been used to indirectly estimate copepod production in the southern Benguela region, based on field sampling of copepod stages and laboratory measurements of growth and development rates under variable food and temperature regimes. Estimates of production have steadily increased from 11 gC m<sup>-2</sup> y<sup>-1</sup> in 1979 to 80 gC m<sup>-2</sup> y<sup>-1</sup> in 1987. Since 1988, extensive measurements of copepod egg production and moulting rates of <em>Calanus agulhensis</em> at sea during hydro-acoustic fisheries surveys over the south and west coasts of South Africa in November have provided more direct estimates of copepod production. Daily Mean Production: Mean...
Tipo: Info:eu-repo/semantics/article
Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=5547
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Developing a basis for detecting and predicting long-term ecosystem changes IRD
Jarre, A.; Moloney, C.L.; Shannon, L.J.; Fréon, Pierre; Van der Lingen, C.D.; Verheye, H.M.; Hutchings, L.; Roux, J.P.; Cury, Philippe.
Tipo: Text Palavras-chave: MILIEU MARIN; FONCTIONNEMENT DE L'ECOSYSTEME; PREVISION; MODELISATION; SYSTEME EXPERT; ANALYSE MULTIVARIABLE; INDICATEUR ECOLOGIQUE; PRODUCTION PRIMAIRE; ZOOPLANCTON; FACTEUR ABIOTIQUE; FACTEUR CLIMATIQUE; VENT; TEMPERATURE; OXYGENE; COURANT MARIN; UPWELLING; FACTEUR ANTHROPIQUE; PECHE; POLLUTION MARINE; VARIATION INTERANNUELLE; IMPACT DE L'ENVIRONNEMENT.
Ano: 2006 URL: http://www.documentation.ird.fr/hor/fdi:010046903
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Long-term increase in crustacean zooplankton abundance in the southern Benguela upwelling region (1951-1996): bottom-up or top-down control? OMA
Verheye, H.M.; Richardson, A.J..
Since 1951, zooplankton samples have been collected on the shelf along the west coast of South Africa, where pelagic fish recruit each year. Retrospective analysis of collections made during peak recruitment in austral autumn showed a significant increase in the abundance of planktonic crustaceans by two orders of magnitude (from 3.74 × 10<sup>3</sup> ind.m<sup>-2</sup> in 1951 to 7.03 × 10<sup>5</sup> ind.m<sup>-2</sup> in 1996). This long-term increase was accompanied by a shift in the community size structure, which parallelled altered regimes of anchovy and sardine, two size-selective planktivores. The increase in crustacean zooplankton could be related to the observed long-term intensification of coastal...
Tipo: Info:eu-repo/semantics/article
Ano: 1998 URL: http://www.vliz.be/imisdocs/publications/242842.pdf
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Small pelagics in upwelling systems: patterns of interaction and structural changes in "wasp-waist" ecosystems OMA
Cury, P.; Bakun, A.; Crawford, R.J.M.; Jarre, A.; Quiñones, R.A.; Shannon, L.J.; Verheye, H.M..
In upwelling ecosystems, there is often a crucial intermediate trophic level, occupied by small, plankton-feeding pelagic fish dominated by one or a few schooling species. Their massive populations may vary radically in size under intensive exploitation. We have used decadal-scale time series to explore patterns of interactions between these fish, their prey, and their predators so as to quantify functional roles of small pelagic fish in those ecosystems. Top-down control of zooplankton is detected off South Africa, Ghana, Japan, and in the Black Sea. Conversely, bottom-up control of predators, such as predatory fish and marine birds, is observed in the Benguela, Guinea, and Humboldt currents. Thus small pelagic fish exert a major control on the trophic...
Tipo: Info:eu-repo/semantics/article
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=5061
Registros recuperados: 4
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