Sympatric Speciation, Overview
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Sympatric speciation is the formation of a new species within a population that continues living in the same location as its ancestral population, without geographic separation.
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Cichlid fish species diverging within the same lake, without any geographic barrier separating them, are undergoing sympatric speciation.
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Sympatric speciation happens without geographic separation — its isolating mechanisms must arise from some other source entirely.