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Master Thesis

Contribution des habitats estuariens à la productivité et au fonctionnement du réseau trophique de la Seine Aval : impacts des aménagements et du changement global

Abstract : Despite being highly exposed to various anthropogenic and environmental pressures, estuaries are productive and important areas for the maintaining of marine resources. The Seine estuary is a largely altered ecosystem, particularly after Port 2000’s construction. Two spatial ecosystem models (1996-2002 and 2005-2012) using the Ecopath modelling approach have been built. They aimed to estimate the contribution of the various estuarine habitats to the global food web functioning and the impact of the various recent infrastructures. These models are relying on a particular structure, including sedentary trophic group which are associated to a particular habitat and mobile trophic group, corresponding to the top predators. The predator-prey relationships are modelling following a density dependence hypothesis which takes account of the predators’ opportunism and the adaptation. The two models highlighted the structuring role of the benthic communities and the high attractiveness of the Northern and Southern areas in terms of nursery. A predation report has been shown from downstream to upstream and from subtidal areas to intertidal areas during the second time period. Finally, Ecosystem Network Analysis indicated a maturity decrease and an increase of stress in this already stressed estuary.
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Submitted on : Thursday, December 15, 2016 - 9:58:01 AM
Last modification on : Monday, July 6, 2020 - 3:38:22 PM
Long-term archiving on: : Thursday, March 16, 2017 - 6:45:52 PM

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  • HAL Id : dumas-01416934, version 1

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Alexandre Schickele. Contribution des habitats estuariens à la productivité et au fonctionnement du réseau trophique de la Seine Aval : impacts des aménagements et du changement global. Ecologie, Environnement. 2016. ⟨dumas-01416934⟩

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