An excellent example of how an isolated environment with small populations can cause species formation...
I haven't studied the cited carefully, but I thought I'd inject something before things possibly get out of hand in a bad direction.
So, the question is, is the isolated environment causing species formation or is the isolation meerly preserving what were once more widespread populations?
Moose
Professor, geology, Whatsamatta U
Evolution - Changes in the environment, caused by the interactions of the components of the environment.
"Do not meddle in the affairs of cats, for they are subtle and will piss on your computer." - Bruce Graham
"The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness." - John Kenneth Galbraith
"I know a little about a lot of things, and a lot about a few things, but I'm highly ignorant about everything." - Moose