Abstract
In the global warming context, we compared the thermal tolerance of several populations of the crustacean Gammarus pulex (Amphipoda: Gammaridae) along a latitudinal thermal gradient in the Rhône Valley. To disentangle the effect of regional (North vs. South) and local (site-specific) factors, the ecophysiological responses of populations were investigated at two levels of biological organisation: whole organism level considering body size [critical thermal maximum (CTmax), mean speed of locomotion (MS), time mobile (TM)] and organelle function level [mitochondrial respiratory control ratios (RCRs)]. CTmax and RCRs, but not MS and TM, revealed a significantly higher thermal tolerance in southern populations compared to northern ones. Nevertheless, temperatures ≥ 30°C were deleterious for all populations, suggesting that populations located in the warmer limit of the species distribution will be more threatened by climate change as they live closer to their upper thermal limits. The strong differences observed between populations indicate that the species-level thermal tolerance used in predictive models may not be informative enough to study the impact of global warming on species distributions. This work also reveals that an appropriate choice of indicators is essential to study the consequences of global warming since the response of organisms at the whole body level can be influenced by local conditions.
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Acknowledgement
This work was funded through a research grant (WETCHANGE Project, 2010–2012) of the CEP 2009 program of the National Research Agency [Agence Nationale de la Recherche (ANR)]. We are grateful to Nadia Bouissou, Sarah Dalmais, Kathleen Ferrand and Marion Genevois for their help in sampling and experimental work.
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Communicated by: Sven Thatje
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Cottin, D., Roussel, D., Foucreau, N. et al. Disentangling the effects of local and regional factors on the thermal tolerance of freshwater crustaceans. Naturwissenschaften 99, 259–264 (2012). https://doi.org/10.1007/s00114-012-0894-4
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DOI: https://doi.org/10.1007/s00114-012-0894-4