In a changing environment, fitness of a population might be expected to fluctuate, as environmental variables influence that population’s fertility and survival rates. In a recent analysis of long-term fitness of seven primate populations, however, changes in adult survival rates were relatively small (Am. Nat. doi:10.1086/657443; published online 30 November 2010).
Lab Anim. (NY) 40, 4 (2011).
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