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JPR Advance Access published online on August 20, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh132
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Received July 22, 2002
Accepted July 19, 2004

Article

Zooplankton in the Ligurian Sea: Part I. Characterization of their dispersion, relative abundance, and environment during summer 1999

Duncan E. McGehee 1*, David A. Demer 2, Joseph D. Warren 3

1 BAE SYSTEMS, 4669 Murphy Canyon Road, San Diego, CA 92123 USA
2 Southwest Fisheries Science Center, 8604 La Jolla Shores Drive, La Jolla, CA 92037 USA
3 Woods Hole Oceanographic Institution, Woods Hole, MA 02543 USA

* To whom correspondence should be addressed. E-mail: duncan.mcgehee{at}gcccd.net.


  Abstract

The distributions of temperature, salinity, chlorophyll and zooplankton were measured in the Ligurian Sea, north of Corsica, in August 1999. To characterize the physical environment, hydrographic and fluorometric profiles were collected. A net and two acoustic systems were used to measure the distribution of small (< 5 mm) and large (> 5 mm) zooplankton. Highest chlorophyll values were strongly associated with a dome of dense water in the center of the Ligurian Basin. Small zooplankton (copepods and smaller), in contrast, appeared to be associated with the periphery of the basin and were negatively correlated with chlorophyll. Large zooplankton were not correlated with either chlorophyll or small zooplankton. Large zooplankton migrated vertically hundreds of meters every night, while small zooplankton did not appear to migrate much. The physical observations were consistent with (1) a welldocumented geostrophically-driven cyclonic coastal current (the Ligurian Current) fed by sources in the Algerian Basin and Tyrrhenian Sea; and (2) upwelling in the central Ligurian Basin. Large zooplankton, being strong vertical migrators, were potentially insulated from the effects of the currents and therefore stayed resident.


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