RE: NANFA-- exotic species impact

Bruce Stallsmith (
Sat, 29 May 2004 08:52:57 -0400

Yeah, long isolation often results in adaptive radiation, if there's
available habitat and resoures for the species already present. Also, parts
of the modern west ooast are recent additions to the continent, being
smaller slivers of land that before attachment had been offshore
archipelagos with probably low freshwater fish diversity.

And the Appalachians are an ancient mountain group, dating back to around
240 million years if I remember correctly as the supercontinent Pangaea was
breaking up. They also have never been glaciated in that period of time. One
example of this long-term stability is that much of the Tennessee River has
been in its current basin for around 80 million years.

--Bruce Stallsmith
Huntsville, AL, US of A

>From: Irate Mormon <>
>To: "" <>
>Subject: RE: NANFA-- exotic species impact
>Date: Fri, 28 May 2004 22:57:10 -0400
>Quoting Bruce Stallsmith <>:
> > The Rockies have
> > been rising for the last 25 million years or so, which has separated
> > watersheds for a period of time.
>I thought isolation often results in high diversity?? Or maybe I am
>thinking of
>endemism. In the east we have the Appalachians - why is diversity higher
> Because of the age difference?
> Charter member, DNRC
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