Evolutionary species concept

Evolutionary species concept - Cladistic species concept...

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Evolutionary species concept . "A species is a series of ancestor descendent populations passing through time and space independent of other populations, each of which possesses its own evolutionary tendencies and historical fate" (George Gaylord Simpson). Simpson was a paleontologist and emphasis on stability over time is best appreciated in the fossil record. Inherently morphological, but his claim is that morphologies have genetic bases, so it is indirectly a genetical definition. Problem: gaps in the fossil record impose arbitrary boundaries between species, especially those undergoing gradual size/shape evolution. Compare with
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Unformatted text preview: Cladistic species concept (pg. 418). How speciation affects existing taxa can alter one's view of species. Biological species concept . from population-level thinking of the modern synthesis. "Species are groups of actually or potentially interbreeding populations which are reproductively isolated from other such groups" (Ernst Mayr; Museum of Comparative Zoology, Harvard). "Species are systems of populations; the gene exchange between these systems is limited or prevented in nature by a reproductive isolating mechanism or several such mechanisms." (Theodosius Dobzhansky; Rockefeller and Columbia Universities)....
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