Zooplankton spatial distribution along the South African coast studied by multifrequency acoustics, and its relationships with environmental parameters and anchovy distribution

Anne Lebourges-Dhaussy 1 Janet Coetzee 2 Larry Hutchings 2 Gildas Roudaut 1 Cornelia Nieuwenhuys 2
1 IRD [France-Ouest] - Institut de Recherche pour le Développement
2 Department of Environmental Affairs and Tourism, Marine and Coastal Management
Abstract : The Central Agulhas Bank (CAB) is an important component of the southern Benguela ecosystem. Despite relatively low primary production, secondary production supports large populations of mid-trophic-level pelagic fish. Exhaustive sampling of the Agulhas Bank ecosystem was performed during a routine acoustic biomass survey in November 2006. A TAPS-6 was deployed with near-simultaneous, plankton-net sampling. Concurrent collections of fish-school and environmental data permitted a detailed study of the water column. Zooplankton was classified by equivalent spherical diameter (ESD; mm): 0.0-0.35 (Class I), 0.35-0.8 (Class II), 0.8-2 (Class III), and >2.0 mm (Class IV). Clear relationships with environmental parameters were only evident at night on the CAB (west of 23 degrees E) for Classes II and III. Class III exhibited pronounced diel vertical migrations, whereas Class I exhibited a reverse pattern. Also observed were the effects of anchovy predation on small zooplankton aggregated in areas of high chlorophyll a.
Keywords : Agulhas anchovy Benguela multifrequency TAPS-6 zooplankton
Type de document :
Article dans une revue
ICES Journal of Marine Science, Oxford University Press (OUP), 2009, 66 (6), pp.1055-1062. 〈10.1093/icesjms/fsp129〉
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http://hal.univ-brest.fr/hal-00669500
Contributeur : Catherine Bertignac <>
Soumis le : lundi 13 février 2012 - 13:11:43
Dernière modification le : vendredi 27 février 2015 - 10:20:48

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Anne Lebourges-Dhaussy, Janet Coetzee, Larry Hutchings, Gildas Roudaut, Cornelia Nieuwenhuys. Zooplankton spatial distribution along the South African coast studied by multifrequency acoustics, and its relationships with environmental parameters and anchovy distribution. ICES Journal of Marine Science, Oxford University Press (OUP), 2009, 66 (6), pp.1055-1062. 〈10.1093/icesjms/fsp129〉. 〈hal-00669500〉

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