Insects touch nearly every corner of life on this planet, filling endless functional roles and providing services too vast to name — and they are disappearing. According to the largest study of insect populations to date, published in the journal Science, insect populations on land are decreasing by 0.92% per year. This number may seem small, but it amounts to 24% fewer insects in 30 years and 50% fewer in 75 years, a significant decline.
Yet while land-dwelling insect populations dwindle, the numbers of insects that live their lives (or part of them) in freshwater habitats are on the rise by about 1.08% per year. The trend is strongest in the Western U.S. and in Northern Europe, where scientists believe clean water initiatives and anti-pollution legislation over the past 50 years may be responsible for the positive trends.
The study, which analyzed 1,676 sites around the world, revealed that despite overall trends on land and in the water, local trends were highly variable. In general, insects fared better in areas least impacted by humans.
Source: Mongabay
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