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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 6 | PAGES 1145-1167 | 1998
© Oxford University Press

research-article

Short-term changes in the mesozooplanktonic community in theSeine ROFI (Region of Freshwater Influence)(eastern English Channel)

Jean-Claude Dauvin1,3, Eric Thiébaut2 and Zixian Wang1

1Muséum National d'Histoire Naturelle Laboratoire de Biologie des Invertébrés Marins et Malacologie, URA CNRS 699,57 rue Cuvier, 75231 Paris Cedex 05 2Laboratoire d'Océanographie Biologique et Ecologie du Plancton Marin, UPRESA 7076, Université Pierre et Marie Curie - Paris VI Bât. A, Case 6,4 Place Jussieu, 75252 Paris Cedex 05, France 3Station Marine de Wimereux CNRS UPRESA ELICO, BP 80,62930 Wimereux, France

Received on August 25, 1997; accepted on January 26, 1998 Discrete-depth, hourly mesozooplankton samples were collected over a 92 h period in May 1992 at an anchor station within the Seine Region of Freshwater Influence (ROFI) (English Channel). The mesozooplankton community defined as a euryhaline marine assemblage was dominated by the calanoid copepods Acartia spp., Temora longicornis and Centropages hamatus, the cladoceran Evadne nordmanni and the appendicularian Oikopleura dioica. The semi-diurnal tidal current was the dominant factor in determining the short-term temporal changes in the community in terms of density and species composition so that zooplankton patches displayed oscillating motion in relation to tidal advection. Although a few species (e.g. Pleurobrachia pileus) exhibited higher densities around low tide, maximum densities were observed for most species (e.g. T.longicornis and E.nordmanni) around high tide, according to salinity variations. Diurnal changes were only reported for cyclopoid copepods (i.e. Halicyclops sp. and Cyclopina sp.) which wer$$$ mainly endobenthic during the day and moved into the water column at night. Besides temporal changes in depth-averaged densities, most species exhibited vertical migrations at diel and/or tidal periods. Tidal vertical migrations were reported only for a few taxa and could be the result of passive mechanisms (e.g. vertical mixing) rather than of active behaviour. Diel vertical migrations were observed in most of the abundant taxa. While this migration pattern did not appear to be an adaptation to predator avoidance within the Seine ROFI, it could regulate horizontal transport of organisms and promote their retention. The consequences of the short-term mesozooplankton fluctuations for sampling designs are discussed.


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