WAZNE Mohammad
Doctorant : E3S
Université Lyon 1
CNRS, UMR 5023 - LEHNA,
Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés
6, rue Raphaël Dubois - Bât. Forel
F-69622 Villeurbanne Cedex FRANCE
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Plastic waste management is one of the major challenges of the 21st century with around 80% of the 335 million tons produced annually released into the environment. To date, despite equivalent contamination levels than marine water bodies, freshwater ecosystems are poorly studied with less than 15% of scientific publications devoted to these ecosystems. The objective of this project is to determine the transfer and effect of microplastics in a freshwater ecosystem. Microplastic contamination levels of sediments and their associated biota will be investigated in downwelling and upwelling zones along the Ain River. Microplastics will be quantified in two sediment layers and three target organisms to evaluate contamination levels and potential transfers of microplastics from the sedimentary environment to biota. Based on this field approach, laboratory experiments will be set by exposing three organisms (a worm, a fish and an aquatic plant) occurring in the sampled river to different concentrations of microplastics. We will study toxicity markers specific to each organism and measure how microplastics will affect the role played by the organisms on ecosystem functioning. Finally, all of the three organisms will be studied together in the presence of microplastics to understand the effect of this exposure on a simple food web.Plastic waste management is one of the major challenges of the 21st century with around 80% of the 335 million tons produced annually released into the environment. To date, despite equivalent contamination levels than marine water bodies, freshwater ecosystems are poorly studied with less than 15% of scientific publications devoted to these ecosystems. The objective of this project is to determine the transfer and effect of microplastics in a freshwater ecosystem. Microplastic contamination levels of sediments and their associated biota will be investigated in downwelling and upwelling zones along the Ain River. Microplastics will be quantified in two sediment layers and three target organisms to evaluate contamination levels and potential transfers of microplastics from the sedimentary environment to biota. Based on this field approach, laboratory experiments will be set by exposing three organisms (a worm, a fish and an aquatic plant) occurring in the sampled river to different concentrations of microplastics. We will study toxicity markers specific to each organism and measure how microplastics will affect the role played by the organisms on ecosystem functioning. Finally, all of the three organisms will be studied together in the presence of microplastics to understand the effect of this exposure on a simple food web.- 2023 Dendievel, A.M., Wazne, M., Vallier, M., Mermillod-Blondin, F., Mourier B., Piégay H., Winiarski , T., Krause S., Simon, L., 2023 - Environmental and land use controls of microplastic pollution along the gravel-bed Ain River (France) and its “Plastic Valley”. Water Research, 230, 119518. (10.1016/j.watres.2022.119518)2023 Wazne, M., Mermillod-Blondin, F., Vallier, M., Hervant, F., Dumet, A., Nel, H.A., Kukkola, A., Krause, S., Simon, L., 2023 - Microplastics in Freshwater Sediments Impact the Role of a Main Bioturbator in Ecosystem Functioning. Environmental Science & Technology, 57, 3042−3052. (10.1021/acs.est.2c05662)
