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Réponse du zooplancton à la restauration de l'estuaire de l'Escaut et test d'un modèle de sélectivité trophique

Abstract : The response of the crustacean zooplankton community to improving water quality in the Scheldt estuary was studied (1996-2009). From 2007 onwards, calanoids moved the bulk of their population from the brackish water reach to the freshwater reach, while cyclopoids strongly decreased in freshwater. Contrarily to cyclopoids and cladocerans, calanoids spatio-temporal distribution responded positively to an improvement in water quality. Our findings suggest that the trophic regime of E. affinis shifted from autotrophic to heterotrophic organisms. With a view to testing a trophic selectivity model in a benthic ecosystem, the selective behaviour of bdelloid rotifers of the Garonne periphyton (France) was analysed. Results suggested that they fed selectively on cyanobacteria, witch was, to the best of our knowledge, the first evidence of a selective behaviour of rotifers on cyanobacteria in this medium.
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https://tel.archives-ouvertes.fr/tel-00741853
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Submitted on : Monday, October 15, 2012 - 2:04:17 PM
Last modification on : Thursday, October 15, 2020 - 4:06:51 AM
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Benoît Mialet. Réponse du zooplancton à la restauration de l'estuaire de l'Escaut et test d'un modèle de sélectivité trophique. Biodiversité et Ecologie. Université Paul Sabatier - Toulouse III, 2010. Français. ⟨tel-00741853⟩

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