Increases in the evolutionary potential of upper thermal limits under warmer temperatures in two rainforest Drosophila species.

摘要: Tropical and subtropical species represent the majority of biodiversity. These are predicted to lack capacity evolve higher thermal limits in response selection imposed by climatic change. However, these assessments have relied on indirect estimates adaptive capacity, using conditions that do not reflect environmental changes projected under climate Using a paternal half-sib full-sib breeding design, we estimated additive genetic variance narrow-sense heritability for adult upper two rainforest-restricted Drosophila reared regimes, reflecting increases seasonal temperature Wet Tropics Australia standard laboratory (constant 25°C). Estimates variation heat tolerance were significantly different from zero both summer, but winter or constant, regimes. In contrast, significant broad-sense was apparent all regimes egg-to-adult viability. Environment-dependent expression suggest predicting responses change will be difficult. Estimating future may provide limited insight into evolutionary