Willi wrote:


I'm up in the air about that. For me, it's more complicated than that.
Some different species can be bred and produce fertile offspring but it
can only be done in the lab. That seems like different species to me.
Some different species can breed and produce fertile offspring on their
own but don't in the wild because of different behavioral patterns.
These too seem like different species to me.


There's evidence that in the Skagit river there are three natural
populations, Dollies, Bulls, and hybreds. There are also cutthroat and
rainbow trout, and hybreds of these. Both populations of hybreds are
viable, I don't know the details about their numbers, and how much
breeding the hybreds actually do.

Apparently there are significant enough differences in the genes that
they stick to the notion that bulls and dollies are different species.
I'll know more next week.

Chas
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