>But reproductively isolated populations wouldn't be
>different species since unable to interbreed?
>Still I am struggling to understand the subspecies
>concept.
Hybrids are not so uncommon, showing that crossfertility is not a
good definition of species... or even genus. It's particularly common
with ungulates, horses and whales, in the former & latter occurring
intergenerically.
--
Regards
Andrew
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