predation as the primary selective force in recurrent evolution of gigantism in poecilozonites land snails in quaternary bermuda.during the last half million years, pulses of gigantism in the anagenetic lineage of land snails of the subgenus poecilozonites on bermuda were correlated with glacial periods when lower sea level resulted in an island nearly an order of magnitude larger than at present. during those periods, the island was colonized by large vertebrate predators that created selection pressure for large size and rapid growth in the snails. extreme reduction in land area from rising seas, along with changes in e ...201020554560
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