|Variations à court-terme de la faune planktonique et suprabenthique en baie de Seine dans la zone sous influence d'apports d'eau douce en conditions printanières = Short-term variations of plankton and suprabenthos community in the Seine ROFI (Region of Freshwater Influence) under spring conditions|
Wang, M.Z. (2000). Variations à court-terme de la faune planktonique et suprabenthique en baie de Seine dans la zone sous influence d'apports d'eau douce en conditions printanières = Short-term variations of plankton and suprabenthos community in the Seine ROFI (Region of Freshwater Influence) under spring conditions. PhD Thesis. Université des Sciences et Technologies de Lille. Oceanologie Biologie: Lille. 93 pp.
Université des Sciences et Technologies de Lille; UER de la Terre, Université Lille I, more
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VLIZ: Non-open access 226818
|Document type: Dissertation|
Based on the total of 1297 mesozooplankton and suprabenthos samples collected in May-June in early 90's at stations within Seine ROFI (English Channel), the species composition and short-term spatio-temporal variations of zooplankton and suprabenthos have been studied. The mesozooplankton community was dominated by the calanoid copepods Acartia spp. and Temora longicornis,the cladoceran Evadne nordmanni and the appendicularian Oikopleura dioica. The suprabenthos community was dominated by mysidacea Schistomysis kervillei and Mesopodopsis slabberi, and cumacea Diastylis bradyi and Pseudocuma longicornis. The demersal zooplankton was dominated by larvae of crustacea and larvae of fishes. The semi-diurnal tidal current was the dominant factor in determining the short-term temporal variations of zooplankton and suprabenthos communities in terms of density and species composition. Maximum densities were observed for most zooplankton species (e.g. Temora longicornis and Evadne nordmanni) around high tide. Diurnal variations were only reported for cyclopoid copepods. Most species exhibited vertical migrations at diel periods. However tidal vertical migrations were also reported for a few species. In the bottom boundary zone, the suprabenthos and the demersal zooplankton performed also vertical migrations, especially at two critical moments: dawn and dusk. The dynamics of spatio-temporal variations, the distribution and retention of Pleurobrachia pileus in Seine estuary has also been studied in detail.