Questions: Seven populations of salamanders in the genus Ensatina, occur throughout the western edge of the United States. For years, these populations were considered separate hybrids. The only two populations these populations interbreed to produce healthy edge of the range, referred to as Ensannot interbreed are the ones at the southern

Seven populations of salamanders in the genus Ensatina, occur throughout the western edge of the United States. For years, these populations were considered separate hybrids. The only two populations these populations interbreed to produce healthy edge of the range, referred to as Ensannot interbreed are the ones at the southern

Transcript text: Seven populations of salamanders in the genus Ensatina, occur throughout the western edge of the United States. For years, these populations were considered separate hybrids. The only two populations these populations interbreed to produce healthy edge of the range, referred to as Ensannot interbreed are the ones at the southern

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The text describes seven populations of salamanders of the genus _Ensatina_ along the western edge of the United States. These populations were initially considered separate species. However, the observation is that all but two of the populations interbreed, while the two at the southern edge of the range do not interbreed. This observation is relevant to understanding speciation and the biological species concept.

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