Water Fleas and Global Warming
Van Doorslaer, W., Stoks, R., Duvivier, C., Bednarska, A. and De Meester, L. 2009. Population dynamics determine genetic adaptation to temperature in Daphnia. Evolution 63: 1867-1878.
Van Doorslaer et al. report that the initial populations "showed a significant plastic response to test temperature in all studied life-history traits," and that "compared to 20°C, performance at 24°C was higher," which "fast response," as they describe it, "suggests the capacity for genetic adjustment to temperature changes within a single growing season."
The five researchers say their findings imply that "in natural D. magna populations, sufficient genetic variation is present in the dormant egg bank to support rapid genetic adaptation in response to climate change," and that "these findings corroborate earlier results obtained in a mesocosm selection experiment using a littoral cladoceran species, S. vetulus (Van doorslaer et al., 2007)," both of which findings add to the findings of still other studies "unambiguously demonstrating microevolutionary responses to climate-mediated selection within a short ecological relevant, time frame (Gienapp et al., 2008)."
Gienapp, P., Teplitsky, C., Alho, J.S., Mills, J.A. and Merila, J. 2008. Climate change and evolution: disentangling environmental and genetic responses. Molecular Ecology 17: 167-178.
Van Doorslaer, W., Stoks, R., Jeppesen, E. and De Meester, L. 2007. Adaptive microevolutionary responses to simulated global warming in Simocephalus vetulus: a mesocosm study. Global Change Biology 13: 878-886.