hybridization can facilitate evolutionary divergence and speciation by adding new genetic variation to populations.
Until recently it has been thought to be rare, largely restricted to plants, and of little evolutionary significance. This
view is changing.
Even so its frequency may still be underestimated. Hybridization is most likely to occur in recently evolved species, yet
these are the species in which it is most difficult to detect owing to strong genetic similarity deriving from their recently
shared ancestry.
In the July 2005 issue of The American Naturalist, Peter Grant and colleagues propose a method that teases out an effect on
their genetic similarity due to hybridization, based on the fact that sympatric populations can exchange genes whereas
allopatric populations cannot. Using microsatellite DNA data from Darwin's finches in the Gal?pagos archipelago, they compare
sympatric and allopatric genetic distances in pairs of species and find a striking tendency for a species to be more similar
to a sympatric relative than to allopatric populations of that relative. An important implication of this finding is that
introgressive hybridization has been a persistent feature of the adaptive radiation throughout most of its relatively short
history.
Sponsored by the American Society of Naturalists, The American Naturalist is a leading journal in the fields of ecology and
evolutionary biology and animal behavior. For more information, please see our website: journals.uchicago.edu/AN
Peter R. Grant, B. Rosemary Grant, and K. Petren, "Hybridization in the recent past"165:7 July 2005.
Contact: Carrie Olivia Adams
coapress.uchicago.edu
773-834-0386
University of Chicago Press Journals
journals.uchicago.edu
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