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Better food makes high-latitude animals bigger
Date:1/28/2010

ned that predators might also grow larger as a consequence of eating larger herbivores.

"We don't think that this is the only explanation for Bergmann's rule," Ho added. "But we do think that studies of Bergmann's rule should consider ecological interactions in addition to mechanisms based on physiological responses to temperature."

It's not known why the higher-latitude plants might be more nutritious. But research in Pennings's lab at the University of Houston offers a clue. Pennings has shown that plants at low latitudes suffer more damage from herbivores than those at higher latitudes. Ho and Pennings suggest that perhaps lower nutrition and increased chemical defenses are a response to higher pressure from herbivores.


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Contact: Kevin Stacey
kstacey@press.uchicago.edu
773-834-0386
University of Chicago Press Journals
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