Journal of Plankton Research Vol.23 no.3 pp.243-261, 2001
© Oxford University Press 2001
Zooplankton Community During the Transition from Spring Bloom to Oligotrophy in the Open NW Mediterranean and Effects of Wind Events. 2. Vertical Distributions and Migrations
1 Lov, Station Zoologique, Observatoire Océanologique, Bp 28, 06234 Villefranche-Sur-Mer Cédex, France, 2 Plankton Department, Institute Of Biology Of The Southern Seas (ibss), Nakhimov Av-2, Sevastopol, 99011 Crimea, Ukraine And 3 Laboratoire Conchylicole De Normandie, Ifremer, Bp 32, 14520 Port-En-Bessin-Huppain, France
Vertical distribution of zooplankton was investigated over a 3-week period at a fixed station in the open NW Mediterranean during the DYNAPROC cruise (May 1995). The observational period coincided with the transition from spring bloom to oligotrophy in this area. Vertical distribution and migration in the 01000 m water column are described in detail for the main species of copepods (>500 µm). Ontogenetic migration is reported for Neocalanus gracilis, Euchaeta acuta and Pleuromamma abdominalis. This study also documented the downwards seasonal migration of Calanus helgolandicus. Short-term changes in the vertical distribution of the small-sized organisms (>50 µm) in the upper 100 m are discussed in relation to the two major wind events that occurred during the cruise. The naupliar stages of copepods and euphausiids appeared unable to counter the upwards vertical advection and the wind-induced mixing, while no marked changes were observed for Oithona spp. and Microsetella spp.
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