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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Composition and distribution of hyporheic assemblages across a flood plain of a sub-mediterranean river, the Durance
Auteurs :	Cécile Claret, Auteur ; Gaelle Lienhardt, Auteur ; Valentine Cartier, Auteur ; Evelyne Franquet, Auteur ; Guillaume Miralles, Auteur
Type de document :	Article
Dans :	Ecologia Mediterranea (33 2007)
Article en page(s) :	5-13
Résumé :	Alluvial flood plains are among the most heterogeneous and dynamic ecosystems in the world. This heterogeneity is linked to the mosaic of terrestrial and aquatic habitats in surface waters, as well as to the functional relationships between surface and subsurface waters via the hyporheic zone (i.e. the ecotone between benthic and groundwater compartments). In natural systems, discharge and flow variability influence the connectivity among habitats and ecological conditions within habitats that contribute to the richness of flood plains. However, the natural dynamics of many rivers and streams have been impacted by regulation and low residual discharge that change the composition and structure of invertebrate assemblages. In the Durance River, a regulated river in the south-east of France, the benthic fauna of the main channel has been widely studied, but the hyporheic zone has never been considered. In this study, we present some first data on the composition and the distribution of invertebrate assemblages from the hyporheic zone of an alluvial flood plain located in the middle stretch of the Durance. This study provides some biological informations on a poorly known compartment of this sub-Mediterranean system.

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