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Trends Ecol Evol. 2005 Aug;20(8):435-40. Epub 2005 Jun 13.

Adaptation and speciation: what can F(st) tell us?

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School of Animal and Microbial Sciences, The University of Reading, Whiteknights, PO Box 228, Reading, UK, RG6 6AJ.


A useful way of summarizing genetic variability among different populations is through estimates of the inbreeding coefficient, F(st). Several recent studies have tried to use the distribution of estimates of F(st) from individual genetic loci to detect the effects of natural selection. However, the promise of this approach has yet to be fully realized owing to the pervasive dogma that this distribution is highly dependent on demographic history. Here, I review recent theoretical results that indicate that the distribution of estimates of F(st) is generally expected to be robust to the vagaries of demographic history. I suggest that analyses based on it provide a useful first step for identifying candidate genes that might be under selection, and explore the ways in which this information can be used in ecological and evolutionary studies.


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