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JPR Advance Access originally published online on February 16, 2004
Journal of Plankton Research 2004 26(3):275-293; doi:10.1093/plankt/fbh036
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Journal of Plankton Research Vol. 26 No. 3 © Oxford University Press 2004; all rights reserved

Vertical distributions of zooplankton across the Almeria–Oran frontal zone (Mediterranean Sea)

Valerie Andersen*, Corinne Devey, Alexandra Gubanova1, Marc Picheral, Victor Melnikov2, Sergey Tsarin2 and Louis Prieur

Laboratoire D’oceanographie de Villefranche (LOV, UMR 7093), Observatoire Oceanologique, BP 28, 06234 Villefranche-Sur-Mer Cedex, France, 1 Plankton Department and 2 Department of Ecological Biophysics, Institute of Biology of the Southern Seas (IBSS), Nakhimov AV-2, Sevastopol, 99011 Crimea, Ukraine

* Corresponding Author: andersen{at}obs-vlfr.fr

The vertical distribution of zooplankton in the upper 700 m of the water column was investigated across the Almeria–Oran front (Alboran Sea) during winter 1997/98 (Almofront 2 cruise). Eight sites corresponding to three hydrodynamic structures (the Atlantic jet, an anticyclonic gyre and the surrounding Mediterranean waters) were explored, by day and at night, using multiple-net sampling. Results are presented for the major species of copepods (>500 µm), macroplankton and microplankton. Species inhabiting the surface layer or occupying it at night extended deeper in the gyre. On the other hand, mesopelagic species (e.g. Pleuromamma borealis, Pleuromamma abdominalis, Euphausia krohni and Cyclothone braueri) were found to live deeper, at least by day for the migrants, in the Mediterranean waters compared with the two other structures. These changes in preferential depths across the front are discussed in relation to environmental features, such as light level, abundance of food and mixed layer depth. This study also documented the vertical distribution of some overwintering copepod species (Calanus helgolandicus, Eucalanus hyalinus and Eucalanus monachus).


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