Abstract
In multiple stress situations, the co-occurrence of environmental and chemical factors can influence organisms’ ability to cope with toxicity. In this context, the influence of light adaptation on the response of freshwater biofilms to sudden light changes or to herbicides exposure was investigated by determining various parameters: diatom community composition, photosynthetic parameters, chlorophyll a content, antioxidant enzyme activities. Biofilms were grown in microcosms under sub-optimal, saturating, and high light intensities and showed already described characteristics of shade/light adaptation (community structure, photosynthetic adaptation, etc.). Light history modulated antioxidant and photosynthetic responses of biofilms to the stress caused by short-term exposure to sudden light changes or to herbicides. First biofilms adapted to sub-optimal light intensity (shade-adapted) were found to be more sensitive to an increase in light intensity than high-light adapted ones to a reduction in light intensity. Second, while light history influenced biofilms’ response to glyphosate, it had little influence on biofilms’ response to copper and none on its response to oxyfluorfen. Indeed glyphosate exposure led to a stronger decrease in photosynthetic efficiency of shade-adapted biofilms (EC50 = 11.7 mg L−1) than of high-light adapted communities (EC50 = 35.6 mg L−1). Copper exposure led to an activation of ascorbate peroxidase (APX) in biofilms adapted to sub-optimal and saturating light intensity while the protein content decreased in all biofilms exposed to copper. Oxyfluorfen toxicity was independent of light history provoking an increase in APX activity. In conclusion this study showed that both previous exposure to contaminants and physical habitat characteristics might influence community tolerance to disturbances strongly.
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Acknowledgments
We thank Berta Bonet for technical support during sampling. Financial support was provided by the EU project: KEYBIOEFFECTS (MRTN-CT-2006-035695) and the Spanish project: Fluvialmultistress (Ministerio de Ciencia y innovación, CTM2009-14111-CO2-01).
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Bonnineau, C., Sague, I.G., Urrea, G. et al. Light history modulates antioxidant and photosynthetic responses of biofilms to both natural (light) and chemical (herbicides) stressors. Ecotoxicology 21, 1208–1224 (2012). https://doi.org/10.1007/s10646-012-0876-5
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DOI: https://doi.org/10.1007/s10646-012-0876-5