Disentangling the effects of local and regional factors on the thermal tolerance of freshwater crustaceans.

Die Naturwissenschaften
Delphine CottinChristophe Piscart

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 ap...Continue Reading

References

Feb 17, 2006·The Journal of Experimental Biology·Bruce ShillitoFrançoise Gaill
Nov 1, 2008·Science·Hans O Pörtner, Anthony P Farrell
Apr 5, 2011·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·C MaazouziF Hervant
Nov 29, 2011·Marine Genomics·Lloyd S Peck

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Citations

Dec 20, 2013·Proceedings. Biological Sciences·Lev Y YampolskyDieter Ebert
Nov 26, 2013·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·N FoucreauF Hervant
Jan 16, 2015·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Delphine CottinChristophe Piscart

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