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We assigned geographic areas using the distributions of allopatric and sympatric species as a guide: North America, Mexico, Central America, South America, and the Greater Antilles.
Populations of sympatric species often fluctuate in partial synchrony.
Indeed, sympatric speciation events have been observed in controlled experiments, under natural conditions, and also demonstrated by simulation models.
Attention has focused on a number of problems, including reinforcement, sympatric speciation, and the ecological context of speciation.
These two sympatric species are reproductively isolated and represent highly divergent lineages in the genus.
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