Increased assimilation efficiency and mortality rate in Gammarus fossarum exposed to PVC microplastics
2025
Barthelemy, Nans | Mermillod-Blondin, Florian | Espeyte, Anabelle | Wazne, Mohammad | Hervant, Frédéric | Broillet, Ghislaine | Degli-Esposti, Davide | Chaumot, Arnaud | Krause, Stefan | Simon, Laurent | Datry, Thibault | LEHNA - Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés [équipe E3S] (LEHNA E3S) ; Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS) | RiverLy - Fonctionnement des hydrosystèmes (RiverLy) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | School of Geography, Earth and Environmental Sciences [Birmingham] ; University of Birmingham [Birmingham] | Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) ; École normale supérieure de Lyon (ENS de Lyon) ; Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) | Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon | Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS) | Zone Atelier Bassin du Rhône (LTSER-ZABR) ; LTSER Réseau des Zones Ateliers (RZA) ; Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) ; Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) ; Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) | ANR-16-IDEX-0005,IDEXLYON,IDEXLYON(2016) | ANR-17-EURE-0018,H2O'LYON,School of Integrated Watershed Sciences(2017)
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Show more [+] Less [-]English. Shredder organisms play a key role in rivers by feeding and fragmenting coarse organic matter that will then beexploited by other consumers. The effects of microplastics (MPs) on Gammarus sp., an ubiquitous genus offreshwater amphipods, and its shredding activity have been broadly investigated. However, the potentialbehavioral and physiological effects of different sizes of MPs on Gammarus sp. remain overlooked despite therecognized influence of MP size on MP toxicity. This study investigated the effects of a 28-day exposure to fourdifferent concentrations of two size fractions of PVC-microplastics (PVC-MPs), on Gammarus fossarum mortalityrate, feeding rate, assimilation efficiency, and expression of proteins involved in key processes. Increased mortalitywas observed for all treatments exposed to PVC-MPs, with higher mortality in the presence of smaller PVC-MPs at the highest concentration. No protein biomarker modulation was observed in presence of PVC-MPs,suggesting that no metabolic stress but direct physical damages of PVC-MPs might have led to the observedmortalities. No difference was observed for feeding rates, but a higher assimilation efficiency was measured forindividuals exposed to PVC-MPs, regardless of the concentration. This could be due to energy reallocation towardsdefense mechanisms or indicate a potential shift in digestive microbiota. This study highlighted thetoxicity of PVC-MPs, particularly of smaller sizes and even at relatively low concentration, for Gammarus fossarum.PVC-MP pollution may therefore alter the functional integrity of river ecosystems by reducing theabundance of shredder organisms and, subsequently, the process of leaf litter decomposition.
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