Adaptive radiation in island chains
(finches; honeycreepers)
Exploiting a new niche in a common
location
Extrinsic factor prevents two or more
groups from mating with each other
regularly
Gene flow has been reduced between flies
that feed on different food varieties, even
though they both live in the same
geographic area.
Genetic polymorphism results in
reproductive isolation
Population isolated from another due to
geographic barrier
Populations remain in same physical area.
The gradual formation of the Grand
Canyon split a population into 2 divergent
species
Allopatric Speciation
Sympatric Speciation