Variabilité et déterminants de la bioaccumulation des métaux par les poissons marins : cas du Grand Ecosystème Marin du Courant des Canaries

Abstract : The Canary Current Large Marine Ecosystem in West Africa is one of the most productive upwelling ecosystems. It is subjected to anthropogenic inputs leading to metal accumulation by marine fish species, which show a great variability in terms of metal concentrations. This PhD work aims to characterize the major parameters determining metal accumulation by marine fish, based on the case study of the Canary current. Two main approaches were developed concerning physiological and ecological features. At a first integration level, physiological characteristics such as assimilation efficiency, metallothionein concentrations and subcellular metal partitioning influence bioaccumulation. At a second level, prey composition plays a key role due to the dominance of metal accumulation through dietary intakes in marine fish. Finally, habitat drives metal exposure to fish due to the biogeochemical cycle of the metal elements.This study proposed an innovating approach, combining analyses from the cellular level to the ecosystem one, including the individual level, and aiming for a thorough comprehension of a mechanism implying consequences on marine resource conservation and human safety.
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Gaël Le Croizier. Variabilité et déterminants de la bioaccumulation des métaux par les poissons marins : cas du Grand Ecosystème Marin du Courant des Canaries. Sciences de la Terre. Université de Bretagne occidentale - Brest, 2017. Français. ⟨NNT : 2017BRES0047⟩. ⟨tel-01615813⟩

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