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Hydrobiologia

, Volume 373, Issue 0, pp 333–347 | Cite as

Biological components from the Seine estuary: first results

  • Pascal Mouny
  • Jean Claude Dauvin
  • Christophe Bessineton
  • Bernard Elkaim
  • Serge Simon
Article

Abstract

The Seine estuary plays an important role in the dynamics of the eastern English Channel ecosystem. Nevertheless, its biological compartment is poorly known. This constitutes an important handicap to establish the precise state of the health of this major European estuary. The objectives of this study were to identify the life resources of the estuary: macrobenthos, mesozooplankton, suprabenthos, and fish populations and to define the main trophic links in two parts of the estuary (i.e. the polyhaline and oligohaline zones). There is an impoverishment of the biological diversity from the polyhaline zone to the oligohaline zone. The benthic and pelagic fauna of the Seine estuary is similar to other North-Eastern Atlantic estuaries. But the pelagic fauna, especially the copepod Eurytemora affinis and the shrimp Palaemon longirostris seemed to be more abundant in the Seine estuary than in other estuaries. Two macrobenthic communities occurred in the estuary: a diversified and abundant Abra alba-Pectinaria koreni community in the outer part of the estuary and a Macoma balthica community in the inner part. This latter was especially poor in specific richness, density and biomass, in all areas, except on tidal mud flats. Two trophic chains were identified. In the oligohaline zone corresponding to the maximum turbidity zone (high turbidity, low concentration of oxygen), the trophic chain was exclusively planktonic due to the dredging of the estuary which prevented permanent benthic fauna formation. In this zone, the number of fishes was relatively low in spite of high biomass of mesozooplankton and suprabenthos. In the outer part of the estuary, low turbidity and high concentration of oxygen are more favourable to fish populations which feed especially on benthic fauna.

Seine estuary macrobenthos mesozooplankton suprabenthos ichtyofauna trophic chains 

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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Pascal Mouny
  • Jean Claude Dauvin
  • Christophe Bessineton
  • Bernard Elkaim
  • Serge Simon

There are no affiliations available

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