Making sense of genomic islands of differentiation in light of speciation

To characterize the genetic underpinnings of speciation, genome scans can identify genomic regions that differ between divergent populations of wild organisms. In this Review, Wolf and Ellegren describe the methodological details of these approaches and how genomic islands of differentiation should be interpreted cautiously in the search for 'speciation genes'. They also discuss methodological best practice that takes into consideration genomic differentiation occurring through speciation-independent evolutionary processes.

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