Genetic Divergence During Speciation in Freshwater Snails of the Genus Goniobasis
Genetic Divergence During Speciation in Freshwater Snails of the Genus Goniobasis
Chambers, Steven Mark
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Attempts at crossbreeding may reveal that some of these populations show some reproductive isolation and are therefore subspecies by the criterion used for Drosophila . The morphological similarity of these populations of Goniobasis is based on shell charac- ters. A detailed study of soft anatomy might reveal further subdivisions of the standard G_. floridensis forms. These populations may have been correctly assigned to the same subspecies, but isolation in different drainage systems has restr...icted gene flow. Allopatric populations of these aquatic snails might therefore be expected to be more isolated than more vagile animals such as flying insects. The average identity of subspecies is not significantly different in Drosophila and Goniobasis . This is remarkable when one considers that different criteria were used in designating subspecies in the two groups. Semispecies of Drosophila and Goniobasis show the same level of 28 genetic divergence. This is the crucial step in speciation, when repro- ductive isolation is being perfected.
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