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Isolation---by distance as well as barriers?

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Author Topic:   Isolation---by distance as well as barriers?
InGodITrust
Member (Idle past 1696 days)
Posts: 53
From: Reno, Nevada, USA
Joined: 05-02-2009

InGodITrust Posts Only
Message 1 of 2 (511668)
06-11-2009 4:07 AM

Hi Folks. Help me understand Darwin when he wrote that two or more varieties could be formed in a strictly continuous area. He also wrote he believed "many perfectly defined species have been formed on strictly continuous areas".
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Isn't isolation neccesary for evolution? So if there are no geographical barriers to separate different groups of a species, can mere distance serve to isolate them?
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Hypothetically, I'm thinking of a species of hare that has a range...let's say 300 miles wide. Wouldn't the genes of all the would-be varieties keep criss-crossing across the range, and keep the species pure? Or if the distance is great enough, can varieties form?
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Thanks for any help.
​
Adminnemooseus
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Posts: 3976
Joined: 09-26-2002

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Message 2 of 2 (511671)
06-11-2009 4:35 AM

Thread copied to the Isolation---by distance as well as barriers? thread in the Biological Evolution forum, this copy of the thread has been closed.
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