Limits to speciation inferred from times to secondary sympatry and ages of hybridizing species along a latitudinal gradient.


Range expansions are critical to renewed bouts of allopatric or parapatric speciation. Limits on range expansions-and, by implication, speciation-include dispersal ability and permeability of geographical barriers. In addition, recently diverged taxa may interfere with each other, preventing mutual expansion of each other's range into sympatry, because… (More)
DOI: 10.1086/658910


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