Re: En: species, subspecies, strains, populations, races etc.

["Scott McLaughlin" <relli@aye.net>]

There is a case of two different species of salamanders of the genus ambystoma
whose ranges spread until they overlapped. When the two species ranges overlapped
an interesting thing occured. The two species interbred producing fertile off-spring.
These offspring now out number the two original species in the overlapping portion
of the two original ranges and are spreading into the ranges of their ancestors.
Such is evolution, it doesnt read books on taxonomy. :) I will try to find out
what the three secies are.

Scott

>Hi Tsuh, Mike and others,
>
>Mike,
>I was written my previous post at the time you send yours.
>
>>... Those that cannot
>>interbreed with Sp.A but can with Sp.B would be considered populations of

>Sp.B
>>and visa versa. It's all systematics, after all. Whether you call it a
>species,
>>subspecies or a population doesn't matter to the fish as long as they can

>produce
>>healthy offspring.
>
>What would you say if population A' (that can breed with sp. A but not with

>sp. B) and population B' (vice-versa) can interbreed? All of this being in

>mind that it MUST be natural.
>The guppy was introduced in Brazil as a larvofagous (is this right?, help me

>Tsuh) and now, here in Sao Paulo, we can collect the "barrigudinho-pintado"

>(Poecilia vivipara) with many patterns of guppy. In tanks or ponds they
>interbreed freely, but once the introduction was artificial, we can't say
>that they are of the same species.
>Thanks god I'm not a taxonomist.
>
>Zeco
>
>
>
>
>
>
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