The world has lost more than one quarter of its land-dwelling insects in the past 30 years, researchers say.
, especially the Midwestern United States, and in parts of Europe, but the drop appears to be leveling off in the U.S. in recent years, said the study that pulled together earlier research on more than 10,000 species with data from 1,676 locations.
University of Delaware entomologist Douglas Tallamy, who wasn’t part of the study, said he would drive through the Midwest where there were supposed to be lots of butterflies and other insects but would see only corn and soybeans in an insect desert. Co-author Ann Swengel, a citizen scientist who’s tracked butterflies for more than 30 years, recalled that when driving around Wisconsin a few decades ago, she would “look out in a field and you’d see all these Sulphur butterflies around. I can’t think of the last time that I’ve seen that.”The study detailed quite different losses from place to place and from decade to decade.
, freshwater insects, such as mayflies, dragonflies and mosquitoes, are increasing at more than 1 percent a year, the study found. But those thriving freshwater insects are a tiny percentage of bugs in the world.
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