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Bizarre insect inbreeding signals an end to males: News tips from the American Naturalist
Date:7/27/2011

ans said. Why such diversity on the smaller island? There's less competition on Sulawesi, the researchers say. Fanged frogs in the Philippines have to compete with another genus of frogs, Platymantis. Platymantis never made to hop over to Sulawesi, leaving the fanged frogs free to spread out into new habitat niches, to which they eventually adapted. The rapid evolution of these frogs is a striking example of adaptive radiationa concept Charles Darwin famously recorded in Galapagos finches.

Mohammad I. Setiadi, Jimmy A. McGuire, Rafe M. Brown, Mohammad Zubairi, Djoko T. Iskandar, Noviar Andayani, Jatna Supriatna, and Ben J. Evans, "Adaptive Radiation and Ecological Opportunity in Sulawesi and Philippine Fanged Frog (Limnonectes) Communities."


It takes a village, but only in times of plenty

Acorn woodpeckers are cooperative breeders, meaning adult birds often join breeding groups and help raise young that are not their own. Scientists have long thought that communal breeding may have evolved to help birds deal with food shortages and other difficult times. But a study by researchers from Cornell and Gonzaga shows that for acorn woodpeckers, the opposite seems to be true: Help contributed by other family members is beneficial only when the acorn crop is large. "Apparently when the crop is poor, the additional food that helpers provide to nestlings doesn't make up for the extra resources those helpers are using," said Walter Koenig, the study's lead author. "Whereas when the acorn crop is good, their help is enough to significantly increase both the survivorship of the other birds in the group and the number of young the group can fledge. At least in acorn woodpeckers, living together in a family only confers benefits when food is plentiful."

Walter D. Koenig, Eric L. Walters, and Joseph Haydock, "Variable Helper Effects, Ecological Conditions, and the Evolution of Cooperative Breeding in the Acorn Woodpecker."
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Contact: Kevin Stacey
kstacey@press.uchicago.edu
773-834-0386
University of Chicago Press Journals
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