Abstract
Deciphering evolutionary processes occurring within long-term contaminated wild populations is essential for the ecological risk assessment of persistent chemical contaminations. Using field populations of Gammarus, a commonly-used genus in aquatic ecotoxicology, the present study sought to gain insights into the extent to which long-term exposure to metals in the field could effectively lead to shifts in toxicological sensitivities. For this, we identified a Gammarus population inhabiting a stream contaminated by cadmium (Cd). We compared the Cd-exposure and Cd-sensitivity of this population to those of five reference populations. Active biomonitoring determined in different years and seasons that significant levels of Cd were bioavailable in the contaminated site. Laboratory sensitivity tests under common garden conditions established that this long-term field exposure led to the development of a moderate Cd tolerance, which was maintained after a 3-week acclimatization in the laboratory, and transmitted to offspring produced under clean conditions. The potential physiological costs of tolerance were assessed by means of feeding rate measurements (in the laboratory and in situ). They revealed that, unlike for reference populations, the feeding activity of organisms from the tolerant population was greatly decreased when they were maintained under laboratory conditions, potentially indicating a high population vulnerability to environmental perturbations. Because dissolved Cd concentrations in water from the contaminated site were low (averaging 0.045 µg L−1) and below the current European environmental quality standard for Cd for inland surface waters (fixed at 0.08 µg L−1 in soft water environments), this case study sheds light onto the extent to which current environmental quality standards are protective against potential adverse outcomes of adaptive and micro-evolutionary processes occurring in contaminated environments.
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Acknowledgments
The authors thank for financial Grants the ANR (Agence Nationale de la Recherche) CESA program GAMMA 021 02 “Variability-adaptation-diversity and Ecotoxicology in gammarids” (2012–2015), and ONEMA (the French National Agency for Water and Aquatic Ecosystems) for its financial support. The authors also thank technical staff of the “Ecotoxicology laboratory” and the “Aquatic chemistry laboratory” of Irstea in Lyon, especially R. Recoura-Massaquant, G. Jubeaux, A. Larrose, J Gahou and L Dherret, for their assistance in the field experiments and for analyses of trace elements.
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Vigneron, A., Geffard, O., Coquery, M. et al. Evolution of cadmium tolerance and associated costs in a Gammarus fossarum population inhabiting a low-level contaminated stream. Ecotoxicology 24, 1239–1249 (2015). https://doi.org/10.1007/s10646-015-1491-z
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DOI: https://doi.org/10.1007/s10646-015-1491-z