Body size and shape rarely evolve in early bursts

Abstract:

Although the concept of adaptive radiation traces back to Henry Fairfield Osborn (1902), it was George Gaylord Simpson (1944, 1953) who brought the concept to the forefront of evolutionary biology. Simpson defined adaptive radiation as “more or less simultaneous divergences of numerous lines from more or less the same ancestral adaptive type”(Simpson 1959), and famously postulated that much of life’s diversity originated during these adaptive radiations. However, identifying adaptive radiations in the natural world has proven difficult due to the lack of broad-scale comparative datasets. In fact, almost all accepted adaptive radiations come from endemic radiations of species on isolated oceanic islands or lakes (eg Baldwin and Sanderson 1998, Gillespie 2004, Givnish 1999, Grant and Grant 2008, Losos 2009). Outside of these systems, criteria for recognizing adaptive radiations are murky (but see Givnish …

Año de publicación:

2010

Keywords:

Fuente:

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