Soon spring, flowers, butterflies … Certainly, but for how long? Year after year, the populations of these pollinating insects decline, and a significant loss of their workforce, by 22 % in total, has been recorded in the past two decades, alerts a study conducted in the United States and published Thursday March 6 in the American journal Science.
Collin Edwards, researcher at the State University of Washington, on the Vancouver campus (United States), and its colleagues have for this carried out a new work, based on the analysis of observation data collected between 2000 and 2020 in nearly 2,500 sites across the United States, and relating to 12.6 million butterflies of 554 different species. “It was a colossal work, which consisted in gathering and analyzing all the monitoring data of the populations of butterflies available, in order to know how these species were worn in the country”Collin Edwards argue. The previously conducted studies focused on more limited geographic areas using various methodologies, which complicated large -scale trends.
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