Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 5 6 2008 10.5194/bg-5-1765-2008 http://www.biogeosciences.net/5/1765/2008/ http://www.biogeosciences.net/5/1765/2008/bg-5-1765-2008.html http://www.biogeosciences.net/5/1765/2008/bg-5-1765-2008.pdf 1765 1782 2008-12-16 Short term changes in zooplankton community during the summer-autumn transition in the open NW Mediterranean Sea: species composition, abundance and diversity V. Raybaud raybaud@obs-vlfr.fr P. Nival L. Mousseau A. Gubanova D. Altukhov S. Khvorov F. Ibañez V. Andersen UPMC Université Paris 06, UMR 7093, Laboratoire d'Océanographie de Villefranche, 06230 Villefranche-sur-Mer, France CNRS, UMR 7093, LOV, 06230 Villefranche-sur-Mer, France Plankton Department, Institute of Biology of the Southern Seas (IBSS), Nakhimov av-2, Sevastopol, 99011 Crimea, Ukraine Short term changes in zooplankton community were investigated at a fixed station in offshore waters of the Ligurian Sea (DYNAPROC 2 cruise, September–October 2004). Mesozooplankton were sampled with vertical WP-II hauls (200 &mu;m mesh-size) and large mesozooplankton, macrozooplankton and micronekton with a BIONESS multinet sampler (500 &mu;m mesh-size). Temporal variations of total biomass, species composition and abundance of major taxa were studied. Intrusions of low salinity water masses were observed two times during the cruise. The first one, which was the most intense, was associated with changes in zooplankton community composition. 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