Modern Caterpillars Feed at Higher Temperatures in Response to Climate Change
The work, led by Joel Kingsolver at UNC-Chapel Hill, represents a rare instance of how recent climate change affects physiological traits, such as how the body regulates feeding behavior.
“To our knowledge, this is the first instance where we show changes in physiological traits in response to recent climate change,” says Kingsolver, Kenan Distinguished Professor of Biology in UNC’s College of Arts and Sciences, whose work appears today in the journal Functional Ecology.
Caterpillars can eat and grow only when it’s not too cold and not too hot, explains Kingsolver. But when temperatures are ideal, caterpillars eat with reckless abandon and can gain up to 20 percent of their body weight in an hour. That growth determines their ability to survive, how quickly they become adult butterflies and their ultimate reproductive success.
Jessica Higgins, a graduate student in Kingsolver’s lab who spearheaded the study, worked with fellow graduate student Heidi MacLean, Lauren Buckley, currently at the University of Washington, and Kingsolver to compare modern caterpillars to their ancestors from 40 years ago.
Their results show that the two related species of Colias (sulphur) butterflies have adapted in two ways: they not only broadened the range of their ideal feeding temperatures but also shifted their optimal feeding temperature to a higher one.
In their work, the researchers measured changes in climate at the two study sites and then examined changes in how fast caterpillar ate using current and historical data from the 1970s, collected by Kingsolver’s graduate adviser Ward Watt.
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