There's More Than One Way for Fruit Flies to Beat the Heat
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The two Australian researchers say their analyses revealed "significant evolutionary potential for all three measures of heat tolerance," and that "additive genetic variances were significantly different from zero for all three traits." In addition, they determined that "all three traits would contribute to a response to selection for increased heat tolerance." As a result of their findings, van Heerwaarden and Sgro concluded that "reliance on univariate estimates of evolutionary potential may not provide accurate insight into the ability of organisms to evolve upper thermal limits in nature," and that "combinations of all three traits will contribute to the evolution of upper thermal limits in response to selection imposed by a warming climate."
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