Thermal Plasticity in Swedish Pool Frogs
Orizaola, G. and Laurila, A. 2009. Microgeographic variation in temperature-induced plasticity in an isolated amphibian metapopulation. Evolutionary Ecology 23: 979-991.
According to the two Swedish researchers, results indicated that (1) "in general, larvae exposed to warmer temperature experienced higher survival and metamorphosed faster," that (2) there "were differences among the populations in both trait mean values and in the plastic responses," and that (3) "among-family variation within populations was found in growth rate and time to metamorphosis, as well as in plasticity suggesting that these traits have a capacity to evolve."
Based on these findings, Orizaola and Laurila state that they found "strong population differentiation at a microgeographic scale in life-history characteristics and temperature-induced plasticity in [the] isolated amphibian metapopulation," and that in spite of "the near absence of molecular genetic variation within [the] metapopulation, [their] study detected strong variation in trait means and plastic responses both among and within populations, possibly suggesting that natural selection is shaping life-history traits of the local populations [italics added]," which phenomenon may be preparing them for things to come -- such as even further warming -- by providing them "ample phenotypic variation" to deal with a potentially warming environment.