Biological components from the Seine estuary: first results

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