Species-species interactions modulate copper toxicity under different visible light conditions

Article Article scientifique Article Species-species interactions modulate copper toxicity under different visible light conditions eng 2019 author Cheloni Giulia 764024 author Gagnaux Valérie 676370 author Slaveykova Vera 0000-0002-8361-2509 510054 771-777 10.1016/j.ecoenv.2018.12.039 0147-6513 https://linkinghub.elsevier.com/retrieve/pii/S0147651318313241 Combination of biotic and abiotic factors influences the effects of naturally occurring or anthropogenic chemicals on photosynthetic microorganisms in the aquatic environment. Nonetheless, the combined effects of physical stressors and species-species interaction on chemicals' toxicity are still poorly understood. The present study examines the responses of the green alga Chlamydomonas reinhardtii and the cyanobacterium Synechocystis sp. alone and in mixtures to copper exposure under increasing visible light intensities. Cell growth, chlorophyll bleaching, oxidative stress and membrane permeability were determined by flow cytometry in both mono- and multi-species tests. The results revealed that species-species interactions influenced copper toxicity under different light regimes at 4 h and 48 h - exposure. For a given light condition, monocultures of Synechocystis sp. were more sensitive to copper than those of C. reinhardtii. In long-term incubation C. reinhardtii sensitivity to copper diminished in presence of Synechocystis sp. under low-intensity light, however it was enhanced under high-intensity light. The present results revealed the complex interplay between visible light intensity variations, species-species interaction and copper effects to phytoplankton in long- term exposure. Species-species interaction Copper Light conditions Multiple stressors Chlamydomonas Synechocystis Dewey 333.7-333.9 Dewey 550 Swiss National Science Foundation Metal Bioavailability to Aquatic Photosynthetic Organisms in Changing Environment (BioChEn) 134627 CH Project funding 18 Institut des sciences de l'environnement 0DB 41 Département F.-A. Forel des sciences de l'environnement et de l'eau 153 false 752 Environmental Biogeochemistry and Ecotoxicology 944 ISE Eau 938 ISE Pôle Sciences Ecotoxicology and Environmental Safety 170 92417893-d08c-4f0d-8675-213e88726d3d Article (Published version) Restricted 1-s2.0-S0147651318313241-main.pdf 1542728 application/pdf 98b4e3fc-cbc5-4c38-8bb3-f647f60d41ac Article (Submitted version) Public ManuscriptCheloniSubmitted.pdf 608904 application/pdf openAccess Centres et instituts / Institut des sciences de l'environnement Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département F.-A. Forel des sciences de l'environnement et de l'eau

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Species-species interactions modulate copper toxicity under different visible light conditions	Ecotoxicology and Environmental Safety			2019	516	535

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Gagnaux, Valérie