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Estimating the benthic population ofDreissena polymorpha and its impact in the lower Seine River, France

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Abstract

Dreissena larval fluxes were studied in the lower stretch of the Seine River in 1996–1998. Fluxes reached 150×1012 ind d−1, representing a larval concentration of 5,000 ind l−1 in the Seine estuary. We showed that a sampling frequency with a 3-d interval allowed us to adequately estimate the annual production of larvae. The water residence time in the Seine River and estuary is sufficient for theDreissena larvae to complete their cycle and settlement. High abundance of the larvae in the plankton samples from the Seine River and its estuary showed the existence of a large community of benthic adults, known to be powerful filter-feeders. The progenitor population and the geographical extent of the adultDreissena were estimated from cohort analyses of the planktonic larvae. The maximum density ofDreissena was found in the highly channelized part of the estuary (up to 4,500 ind m−2). Estimated values were compared with concentration of mussels in the benthic traps and samples. Calculated filtration rates of benthic mussels were compared with those of larvae at different stages and with filtration of the zooplankton community. The impact of theDreissena was much higher than that of zooplankton; the filtration of the larvae exceeded that of adults during short periods of maximum larval emission.

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  1. Maïa Akopian

    Present address: Unité Mixte de Recherche, Centre National de Recherche Scientifique Sisyphe 7619, Université Paris P. et M. Curie, B 123, 4 Place Jussieu, F-75252, Paris Cedex 05, France

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  1. Service de Navigation de la Seine, Ile Lacroix, 66-77 Avenue Chstellain, 76100, Rouen, France

    André Ficht

  2. Unité Mixte de Recherche, Centre National de Recherche Scientifique Sisyphe 7619, Université Paris P. et M. Curie, B 123, 4 Place Jussieu, F-75252, Paris Cedex 05, France

    Josette Garnier & Paul Testard

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Akopian, M., Garnier, J., Testard, P. et al. Estimating the benthic population ofDreissena polymorpha and its impact in the lower Seine River, France. Estuaries 24, 1003–1014 (2001). https://doi.org/10.2307/1353013

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