Sticking to people as an example. Look at northern Africa. North west Africans are very different than north east Africans. West Africans (the region used for the slave trade and where most US blacks come from) tend to be of stocky build while those of east Africa tend to be of slight build. East Africans excel as distance runners, west Africans sprinting. There are many other differences as well. So here is a large region where the populations can mix and breed yet there remains differences based on region despite the lack of any physical barriers. Sometimes space alone can serve as a barrier. A gradual barrier but a barrier non the less. Look at the Florida king snake. It definitely differs in the south and north regions of the state with no water or mountain barriers.

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• More on the suri/ guyana issue.... - eliotstone, Thu Feb 17 18:37:38 2005
• RE: More on the suri/ guyana issue.... - obz, Thu Feb 17 23:27:06 2005
• RE: More on the suri/ guyana issue.... - dworon1, Fri Feb 18 02:05:30 2005
• sticking with the human examples... - chicagopsych, Fri Feb 18 10:29:33 2005
• RE: More on the suri/ guyana issue.... - mci, Thu Feb 17 23:45:40 2005
• RE: More on the suri/ guyana issue.... - eliotstone, Thu Feb 17 23:52:54 2005
• But can I breed my Suri/Guyana cross to my Ball Python...... - Hoppy, Fri Feb 18 07:12:29 2005