Randomness in Allopatric Speciation

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Abstract
Data from North American terrestrial vertebrates [reptiles, mammals, birds and amphibians] are used to test hypothesis of randomness in several aspects of allopatric speciation (vicariance). The data do not lead to rejection of the following: the initial parapatry of vicariance tends toward randomness as time passes; barriers are random as to affected species (the congruence of barriers is unusually); ranges of geminate species (a pair formed by vicariance) and subspecies (in species with only 2) are random in size. The theory that barriers that lead to subspecific differentiation arise at random places was modified.

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