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Re: collection locations (was: rachovii) need direction
Harry,
I think I would have to disagree with your conclusions here. You will have
seen the post I just made about the study in salmon. Interbreeding those
reproductively isolated populations was not advantageous. Regarding
flooding, one would have to assume that populations gets transported
(washed) into new habitats, but the little bit that I have seen in Africa,
in the case of Nothos, suggests that the fish sort themselves out. It
appears that despite the floods that we know occur from time to time, the
fish sort themselves out and are persistently found in the same localities.
In 1997 Brian Watters, Ruud Wildekamp and I observed a series of Notho
populations, obviously closely related and probably reproductively isolated
populations of the same species that changed in appearance as we progressed
along a single road. There were differences within a short distance. I
can't remember off hand the distance we travelled, but it was less than 100
km. We kept each of those populations separate (as we do for all locations)
even though they were in some cases only a few kilometers apart. I see no
reason the same rules shouldn't apply to collections in the US or anywhere
else. DNA studies, by the way, are not likely to separate these
populations. In many cases we are not talking about different species
anyway, but reproductively isolated populations within the same species.
Regards,
Barry
At 01:30 PM 11/16/00 -0500, you wrote:
>Doug Dame has hit on a real ticklish situation, namely keeping different
>collection sites of the "same" species of killifish separate. To be
>absolutely accurate, we need direction from the DNA specialists to identify
>each species. There is no good reason (on the contrary it is often beneficial
>to outbreed fish populations to retain virility and health) to keep different
>collection site fish separate if they are the SAME fish! It is a fact that
>many areas flood during the rainy season so the fish are intermixed all over
>the place although they end up, in the dry season, restricted to a small body
>of water once more and we identify them by that collection site. Obviously, a
>lot of work must be done and this looks like a fine project for ALL killie
>organizations to undertake: settle the true identity of our wonderful killies
>before we wipe them out by inbreeding the killies from each single little
>pond for years on end!
>
> Harry
>Specht
>
>Sarasota, FL
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