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Re: N. rachovii
This discussion, which takes place periodically, reminds me that I have
been meaning to bring to your attention a paper that was published in
Science a couple of issues ago. In that paper two populations of salmon
were studied. They were known to have been derived from the same population
no more than 13 generations ago (about 50 years). The two populations
inhabit and breed in different localities, one a beach population and the
other a river population. The paper clearly showed that these populations
had developed reproductive isolation within that time frame. Although they
are still the same species, they have developed morphological and
behavioral differences that set them apart. The show preference for their
own population in breeding behavior, although they are able to interbreed.
Hybrids are disadvantaged in various way.
If you are interested the study, I can dig out the actual reference.
However, I think this study strongly supports the position most of us take
that known locality populations should not be interbred in the aquarium.
At 11:12 AM 11/16/00 -0600, you wrote:
>Tyrone Genade wrote:
> > Almost all the rachovii in the trade come from along the road
> > between the Biera and its airport. Those that don't are clearly
> > marked.
>As a matter of interest, the old aquarium strain of N. rachovii, as
>well as the Beira '91 population (note the correct spelling of "Beira")
>were indeed collected from a locality between Beira and the airport.
>However, it is my understanding that the Beira '98 population is from a
>different locality - still in the immediate vicinity of the town but in
>a different direction. The collector of the '98 population did not
>provide precise locality data and I have been unable to contact him
> > I feel very strongly that strains which represent fish out of large
> > complexes (eg.: kafuensis, guentheri, neumanii, etc...) where a fair
> > amount of taxonomy is under way, strains should not be mixed!!!
> > And the collection codes be retained!!!
>I agree, although it should also be noted that N. guentheri actually
>has a very restricted distribution (on Zanzibar Island) and there would
>appear to be no obvious differences between the fish of different
>populations. In spite of that it is still not a good idea to cross
>populations that have different collection locality designations.
>Brian R. Watters
>Professor and Head
>Department of Geology
>University of Regina
>Regina, Sask. S4S 0A2, Canada
>Tel: (306) 585-4663
>Fax: (306) 585-5433
>E-mail: Brian.Watters at uregina_ca
>See http://www.aka.org/AKA/subkillietalk.html to unsubscribe
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