Re: NANFA-L-- Review of Suckers in North America

Subject: Re: NANFA-L-- Review of Suckers in North America
From: Peter Unmack (peter.lists at)
Date: Tue Oct 12 2004 - 19:10:35 CDT

On Tue, 12 Oct 2004, Irate Mormon wrote:
> Yes, it does appear that invasive species don't suffer much from the lack of
> genetic diversity. I wonder if you were to compare the genetic diversity of
> early generations to later generations, whether the results would be close or
> identical, or whether you would actually find MORE diversity over a few
> generations. Moreover, if you found that such a population had sprouted new
> genetic material, whether those same genes would be found in other populations
> which are isolated from the first one.

Some folks have done this, but I don't think it has been that
comprehensive, so it is probably hard to say. There may be some good
comprehensive examples beyond freshwater fishes that I am unaware of

It is very unlikely you will find more diversity over a few generations as
these changes typically occur very slowly, and most changes to coding
regions that result in amino acid changes are more likely to be lethal.
However, I'm sure if you took a whole genome approach there would be some
change from one generation to the next. But significant change (whatever
that means) usually takes a long time on _average_, but there are no
simple answers to this as technically anything is possible.

It is unlikely that any new alleles generated would not be the same as
those found in other populations, although again, this can occur by
chance, however, the chances are fairly small.

Peter Unmack
currently Salt River, Arizona
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: Fri Dec 31 2004 - 11:27:45 CST