Dam good! Beavers may restore imperiled streams, fish populations

Utah State University scientists report a watershed-scale experiment in highly degraded streams within Oregon’s John Day Basin demonstrates building beaver dam analogs allows beavers to increase their dam building activities, which benefits a threatened population of steelhead trout.

When Lewis and Clark made their way through the Pacific Northwest in the early 19th century, the area’s streams teemed with steelhead and beaver. But subsequent human activities, including harvesting beaver to near extirpation, led to widespread degradation of fish habitat.

Bouwes says these activities may have also exacerbated stream channel incision, meaning a rapid down-cutting of stream beds, which disconnects a channel from its floodplain and near-stream vegetation from the water table. He notes beavers build dams in the incised trenches, but because of the lack of large, woody material, their dams typically fail within a year.

“It’s an ubiquitous environmental problem in the Columbia River Basin and throughout the world.” Bouwes says. “It sets a chain of ecological effects in motion that result in habitat destruction, including declines in fish populations and other aquatic organisms.”

To conduct the experiment, the researchers built beaver dam analogs, known as “BDAs,” by pounding wooden posts into the stream bed, and weaving willow branches between the posts, throughout the 32-kilometer study area.

“Our goal was to encourage beaver to build on stable structures that would increase dam life spans, capture sediment, raise the stream and reconnect the stream to its floodplain,” Bouwes says. “We expected this would result in both an increase in near-stream vegetation and better fish habitat.”

Beavers quickly occupied the BDAs, resulting in an increase in natural dam construction and longevity in Bridge Creek.

“What really impressed us was how quickly the stream bed built up behind the dams and how water was spilling onto the floodplain,” Bouwes says.

The researchers also documented increases in fish habitat quantity and quality in their study watershed relative to the watershed that received no BDAs and saw little increase in beaver activity. The changes in habitat in the watershed receiving BDAs resulted in a significant uptick in juvenile steelhead numbers, survival and production.

“This is, perhaps, the only study to demonstrate beaver-mediated restoration may be a viable and efficient strategy to rehabilitate incised streams and to increase imperiled fish populations,” Bouwes says. “With so many streams that need help, we need to look towards more cost-effective and proven means to restore streams, and beavers may be able to do a lot of the heavy lifting for us.”

See the full article in ScienceDaily

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