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Monarch butterfly populations are thriving in North America
Key Excerpts from Article on Website of UGA Today (Newspaper of the University of Georgia)
Posted: July 11th, 2022
https://news.uga.edu/monarch-butterfly-populations-are-thriv...
For years, scientists have warned that monarch butterflies are dying off in droves because of diminishing winter colonies. But new research from the University of Georgia shows that the summer population of monarchs has remained relatively stable over the past 25 years. Published in Global Change Biology, the study suggests that population growth during the summer compensates for butterfly losses due to migration, winter weather and changing environmental factors. “There’s this perception out there that monarch populations are in dire trouble, but we found that’s not at all the case,” said Andy Davis, corresponding author of the study. “It goes against what everyone thinks, but we found that they’re doing quite well. In fact, monarchs are actually one of the most widespread butterflies in North America.” The study authors caution against becoming complacent, though, because rising global temperatures may bring new and growing threats not just to monarchs but to all insects. This study represents the largest and most comprehensive assessment of breeding monarch butterfly population to date. The researchers compiled more than 135,000 monarch observations from the North American Butterfly Association between 1993 and 2018 to examine population patterns and possible drivers of population changes, such as precipitation and widespread use of agricultural herbicides. The team found an overall annual increase in monarch relative abundance of 1.36% per year.
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