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by rolph 58 days ago
if you consider that geographic barrier is an environment of immediate lethality, or infecundity, that is physiological incompatability, and would be a speciation.

if you consider that geographic barrier, simply precludes, interaction between individuals, then you will have founder effect, thus one population will be genetically decended from a sample of the larger population.

https://en.wikipedia.org/wiki/Founder_effect