We are talking over geological time here - what sort of time span Peter?
The sympatry/allopatry thing is interesting. Remember when we went to the
Barry? We were surprised at the lack of variety compared to the
surrounding regions - only one species of Rainbowfish, one species of
Hardyhead, two species of Ambassis, very few gudgeons and no Blue-eyes. Why
should there be this island of "monotony" in a region of diversity?
Another example that comes to mind from Darwin is the co-existence of
Pseudomugil cyanodorsalis and inconspicuus. but they are estuarine and
perhaps the habitat preference thing is harder to define?
email: bhansen at ozemail.com.au
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From: peter.unmack at ASU.Edu
<<Good stuff. We need some interlectual discussion on this list