varieties; but we have only to suppose the steps of modification to be more ... Science 326, 1704–1707 (2009). Via, S. Sympatric speciation in animals: The ugly duckling grows up.

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 ...

Often this type of speciation occurs in three steps. First, the populations become physically separated, often by a long, slow geological process like an uplift of land, the movement of a glacier ...

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 ...

I am studying the prevalence and mechanistic basis of assortative mating in southern capuchino seedeaters, a highly sympatric radiation of birds in South America, to better understand the processes ...