lecture09_DLR - 1 Geographic distributions provide evidence...

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Unformatted text preview: 1 Geographic distributions provide evidence for evolution Current environment cannot (by itself) account for distributions because many species do not occur where they can ourish (think of introduced species) Very similar habitats or niches are occupied by unrelated taxa in different regions. Taxa occupying different habitats within the same region are often more closely related than are taxa occupying similar habitats in different regions (expected if descent with modification can result (independently) in derived forms). Expanding distribution of the cattle egret since its arrival in the New World Geographic distributions provide evidence for evolution Current environment cannot (by itself) account for distributions because many species do not occur where they can ourish (witness introduced species) Very similar habitats or niches are occupied by unrelated taxa in different regions....
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This note was uploaded on 09/28/2008 for the course BIOEE 2780 taught by Professor Geber during the Fall '07 term at Cornell University (Engineering School).

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lecture09_DLR - 1 Geographic distributions provide evidence...

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