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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on May 8, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(6):1055-1062; doi:10.1093/icesjms/fsp129
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following ICES Journal of Marine Science issue: The Ecosystem Approach with Fisheries Acoustics and Complementary Technologies [View the issue table of contents]

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

Anne Lebourges-Dhaussy1, Janet Coetzee2, Larry Hutchings2, Gildas Roudaut1 and Cornelia Nieuwenhuys2

1 Institut de Recherche pour le Développement, BP70, 29280 Plouzané, France
2 Department of Environmental Affairs and Tourism, Marine and Coastal Management, Private Bag X2, Rogge Bay 8012, South Africa

Correspondence to A. Lebourges-Dhaussy: tel: +33 2 98 22 45 05; fax: +33 2 98 22 45 14; e-mail: anne.lebourges.dhaussy{at}ird.fr.

Lebourges-Dhaussy, A., Coetzee, J., Hutchings, L., Roudaut, G., and Nieuwenhuys, C. 2009. 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, 66: 1055–1062.

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°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

Received 1 August 2008; accepted 20 February 2009; advance access publication 8 May 2009.


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