80% Drop in Freshwater Insect Populations – Global Warming
According to a long-term study in a nature reserve in the State of Hesse, environmental changes attributable to global warming have resulted in an 80% drop in the sizes of freshwater insect populations over the past 40 years.
The Breitenbach, a headwater stream located in the hills of Eastern Hesse, is one of the most intensively investigated watercourses in the world. For more than 40 years, researchers have been following the fortunes of its insect communities. The stream lies within the boundaries of a nature reserve, and its relative remoteness minimizes the direct impact of humans on its flora and fauna.
The analysis, which appears in the journal Conservation Biology, shows that insect communities in the Breitenbach have diminished in abundance by more than 80% over the past four decades. The authors link this alarming decline to climate change.
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