How do new species form? Like most areas of Evolutionary Biology, research related to the formation of new species - 'speciation ' - is rich in historical and current debate. Here, we review both ...

2001. Evolutionary implications of divergent clines in a manakin (Manacus; Aves) hybrid zone. Evolution 55: 2070-2087. *Bush, G.L. 1994. Sympatric speciation in animals new wine in old bottles. TREE 9 ...

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 ...

But according to a study published this week in Nature, new species can arise arbitrarily and without provocation, challenging the widely held notion that physical isolation and selection are the ...

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 ...

Behavioral and phenotypic traits are thought to play a key role early in speciation by influencing where and when individuals come into contact and whether closely related organisms are recognized as ...