Étude des effets de l'interaction entre polluants et ressources sur Myriophyllum spicatum grâce à une approche couplant écotoxicologie et écologie chimique

Abstract : Simultaneous contamination of aquatic ecosystems by pollutants and nutrients is a major problem whose effects on macrophytes are still unknown. The objective of this thesis was to study the effects of different pollutants, herbicides and trace metal elements (TME), in combination with varying resource availability (nitrogen, phosphorus, or carbon) on Myriophyllum spicatum, using parameters from chemical ecology and ecotoxicology. Tests showed contrasting effects of herbicides, but no effects of the TME. In all cases, resource modifications (nitrate, N:P ratio or sucrose) induced significant effects on the physiology and stoichiometry of the plant, which might alter its response to additional stress like pollutants. These results suggest that an imbalance of resources in the presence of pollutants may lead to unforeseen changes in the combined effects on macrophytes, and also highlight the need to add more informative parameters in tests to meet the challenges of multiple stress and improve environmental risk assessment.
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Andréïna Nuttens. Étude des effets de l'interaction entre polluants et ressources sur Myriophyllum spicatum grâce à une approche couplant écotoxicologie et écologie chimique. Biochimie, Biologie Moléculaire. Université de Lorraine, 2016. Français. ⟨NNT : 2016LORR0143⟩. ⟨tel-01752368⟩

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