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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	First ecological observations in French hydro systems of freshwater Polychaeta Hypania Invalida introduced in Western Europe (2006)
Auteurs :	S. Devin, Auteur ; M. Akopian, Auteur ; J. F. Fruget, Auteur ; A. Di Michelle, Auteur ; J. N. Beisel, Auteur
Type de document :	Article
Dans :	Vie et Milieu - Life and Environment (56(3) septembre 2006)
Article en page(s) :	247-254
Langues:	Anglais
Résumé :	Hypania invalida is a freshwater Polychaeta from the Ponto-Caspian area recently introduced in Western Europe. The aim of this manuscript is to examine its spread in French hydrosystems, to analyse its density in colonised ecosystems and to test the occurrence of a facilitative interaction with Corbicula spp., invasive Bivalvia in many European large rivers. To date H. invalida occurred in the Moselle, the Marne, the Seine, the Rhine and the Rhone Rivers, i.e. the main French hydrosystems. It occurred also in the Meuse River near the border between France and Belgium. The densities observed varied in a broad range and could reach several thousands of individuals by square meter in the channel. At a local scale, the spatial distribution depends on the substrate type constituting the river bottom. In canalised rivers H. invalida reached the highest densities on deposit substrates with an important organic part. When deposit substrates are lacking, H. invalida was aggregated on gravels, pebbles and Corbicula shell bed. The lowest densities were observed on roots and macrophytes. In the Moselle River, the main tributary of the Rhine River, the colonisation was very fast and the resulting densities were the same as in the Belgian Meuse River or in the Rhine River. One year after its introduction on a given site the species can be the prevailing one in term of densities in the channel, with 50% of all collected benthic macro-faunal individuals. No facilitative interaction has been evidenced with Corbicula, some results even indicated that the living molluscs had a negative effect on the Polychaeta. After an explosive demography in the Marne River, the observed densities decreased to a low level varying between several tens and several hundreds of individuals by square meter. These first results suggest that H. invalida has an important ability to spread between hydrosystems but a low competitive value.
En ligne :	https://wwwphp.obs-banyuls.fr/Viemilieu/index.php/volume-56-2006/56-issue-3.html

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