The biological equivalent is "allopatric speciation," an evolutionary process in which one species divides into two because the original homogenous population has become separated and both groups ...

However, species-level phylogenies and distributions cannot be used to unambiguously prove a particular geographic mode of speciation (e.g., sympatric v. allopatric) because geographical ranges ...

Evolution 55: 2070-2087. *Bush, G.L. 1994. Sympatric speciation in animals new wine in old bottles. TREE 9: 285-288. Clarke, B., M.S. Johnson, and J. Murray. Clines in the genetic distance between two ...

The Midas cichlid fish from the crater lakes of Nicaragua are one of the the best known examples for sympatric speciation. They evolved from a source population into a variety of independent ...