نتایج جستجو برای: clinal variation
تعداد نتایج: 296685 فیلتر نتایج به سال:
Examining how morphology, life history and physiology vary along environmental clines can reveal functional insight into adaptations to climate and thus inform predictions about evolutionary responses to global change. Widespread species occurring over latitudinal and altitudinal gradients in seasonal water availability are excellent systems for investigating multivariate adaptation to drought ...
Given that evolution can generate rapid and dramatic shifts in the ecological tolerance of a species, what prevents populations adapting to expand into new habitat at the edge of their distributions? Recent population genetic models have focused on the relative costs and benefits of migration between populations. On the one hand, migration may limit adaptive divergence by preventing local popul...
We compared sequence variation in the complete mitochondrial cytochrome-b gene with chromosomal and geographical variation for specimens of Peters' tent-making bat (Uroderma bilobatum). Three different chromosomal races have been described in this species: a 2n = 42 race from South America east of the Andes, a 2n = 44 from NW Central America and 2n = 38 from the rest of Central America and NW S...
Shiao, Bode, Beyer, and Selvig argue that the theory of race as a social construct should be revisited in light of recent genetic research, which they interpret as demonstrating that human biological variation is patterned in “clinal classes” that are homologous to races. In this reply, I examine both their claims and the genetics literature they cite, concluding that not only does constructivi...
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