Yellowstone willows 2016 (IMAGE)

Colorado State University

Yellowstone willows 2016

Caption

In 2001, CSU researchers established four intensive study areas in Yellowstone to test the effects of reduced browsing by fencing and increased water availability by creating simulated beaver dams. In this photo from 2016, the willows in the fenced area that also had increased water availability grew three times taller and much more densely than unfenced areas without groundwater access, shown in the foreground.

Credit

David J. Cooper

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