Smallest species shifting the fastest: Bird bodysize predicts rate of change in a warming world umich PNASNews
That's the main finding of a new University of Michigan-led study scheduled for online publication May 8 in the journaland wing-length changes in a total of more than 86,000 bird specimens over four decades in North and South America. One study examined migrating birds killed after colliding with buildings in Chicago; the other looked at nonmigrating birds netted in the Amazon.
It could be that smaller-bodied birds are adapting more quickly to evolutionary pressures.
"Our results suggest that large body size could further exacerbate extinction risk by limiting the potential to adapt to rapid, ongoing anthropogenic change," said study lead author Marketa Zimova, a former U-M Institute for Global Change Biology postdoctoral researcher now at Appalachian State University.
The smallest bird among the Chicago species was the golden-crowned kinglet at an average size of 5.47 grams, and the largest was the common grackle at 107.90 grams. Among the Amazonian species, the fork-tailed woodnymph was the smallest at 4.08 grams, and the largest was the Amazonian motmot at 131.00 grams.
The large and complementary datasets provided a unique opportunity to test whether two fundamental organismal traits—body size and generation length—shaped the birds' responses to rapid environmental change.
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