Until recently, the land snails of the Hawaiian Islands were largely restricted to a single valley.Because snails move only short distances, the high ridges that surround the valley were effective barriers to their dispersal, and about 1,000 species of land snails evolved.This illustrates how speciation rates are

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The fact that the land snails of the Hawaiian Islands were largely restricted to a single valley due to their poor dispersal abilities, and yet managed to evolve about 1,000 species, suggests that speciation rates are usually higher in species with relatively poor dispersal abilities. This is because limited dispersal can result in geographic isolation, which can promote speciation over time.

Until Recently, the Land Snails of the Hawaiian Islands Were