The Capacity for Thermal Acclimation in Mosquitofish
Seebacher, F., Holmes, S., Roosen, N.J., Nouvian, M., Wilson, R.S. and Ward, A.J.W. 2012. Capacity for thermal acclimation differs between populations and phylogenetic lineages within a species. Functional Ecology 26: 1418-1428.
From their analysis, the six scientists were able to demonstrate that mosquitofish populations "are divided into distinct genetic lineages and that populations within lineages have distinct genetic identities." In addition, they report "there were significant differences in the capacity for acclimation between traits (swimming performance, citrate synthase and lactate dehydrogenase activities), between lineages, and between populations within lineages," thereby demonstrating that "there can be substantial variation in thermal plasticity between populations within species," leading them to conclude that "similar responses are likely to be found in other species that comprise structured populations."
Noting further that "many predictions of the impact of climate change on biodiversity assume a species-specific response to changing environments," Seebacher et al. proceed to argue, on the basis of their results, that "this resolution can be too coarse and that analysis of the impacts of climate change and other environmental variability should be resolved to a population level," since their findings suggest that some populations of a species may indeed be able to cope with a change of climate with which others cannot, thereby preventing the otherwise inevitable climate-induced extinction of the species.