Beavers are changing Alaska's climate. Free Technical Library News

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Beavers are changing Alaska's climate

03.07.2020

Specialists from the Institute of Polar and Marine Research. Alfred Wegener in Germany found that beavers living in an area of 18 thousand square meters. km in the northwest of Alaska, in just 5 years 56 new lakes were created. This could intensify permafrost thawing and accelerate climate change.

Beavers are rapidly spreading across Alaska. In just a few years, they have populated many tundra regions where they have never been seen before. From two dams in 2002, the number of dams has risen to 98 by 2019, with more than 5 barriers built annually by beavers.

Animals often build their dams in precisely those places where it is easy to achieve results with the least effort. When beavers block water bodies, small valleys fill with water and form new lakes, which are measured in hectares. They block small streams and sometimes the headwaters of existing lakes, which widen as a result. Thus, a new lake is formed, which melts the permafrost. This has already affected the water balance.

Over the course of 17 years, in the Alaska region of Kotzebue, where observations were made, the total area of the water area increased by 8,3%, about two-thirds of this growth was associated with the activity of beavers.

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