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Distribution et rôle trophique du zooplancton dans le bassin versant de l'Escaut

Abstract : Structural and functional characteristics of the Scheldt basin zooplankton have been studied in relation with environmental conditions presented in watercourses. The Scheldt runs for 350 km from Northern France to the Netherlands, crossing Belgium. Its basin drains an area subject to multiple pollutions originating from industrial, agricultural and domestic activities. As a consequence, ecological states of watercourses are unsatisfactory according to the Water Framework Directive (WFD) evaluation. So far, studies on Scheldt zooplankton have focused on estuarine reaches, and the upstream basin's communities were scarcely documented. From source to mouth of the Scheldt, 4 functional zones have been identified presenting different habitat conditions for zooplankton, defined mainly by salinity gradient and tidal influence. At the scale of the non-tidal watershed, spatial and temporal variability of zooplankton communities have been explored, in relation with environmental conditions. Zooplankton distribution showed a strong heterogeneity, inducing little predictability concerning ecological status (WFD), environmental conditions, and contamination patterns of sites (considering a set of persistent organic pollutants and trace metals characteristics of the study area). However, an important trophic role has been highlighted. The zooplankton community between 50-250 µm showed a selective feeding on some algal groups, particularly on chlorophytes, and and the results suggest a grazing activity on cyanobacteria.
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https://tel.archives-ouvertes.fr/tel-01810748
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  • HAL Id : tel-01810748, version 1

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Maïwen Le Coz. Distribution et rôle trophique du zooplancton dans le bassin versant de l'Escaut. Biodiversité et Ecologie. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30044⟩. ⟨tel-01810748⟩

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