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Beaver: Nature’s ecosystem engineers

This review summarizes how beaver impact ecosystem structure and geomorphology, hydrology and water resources, water quality, freshwater ecology, and humans and society.

Beaver Effects on Trout and Salmon

Multiple studies cited showing an overall beneficial effect of beaver dams on salmon and trout.

The Importance of Beaver Ponds to Coho Salmon Production in the Stillaguamish River Basin, Washington, USA

NOAA study of beaver habitat effects on Coho salmon reproduction and growth in Washington state.

Modifications to the Clemson Pond Leveler to Facilitate Brook Trout Passage

The Clemson Pond Leveler effectively controls beaver pond flooding but will not pass migrating fish as it is typically installed. This modified design will allow for the passage of fish.

Leave It To Beavers To Help Salmon?

They found that beaver dams can inhibit migration, and can also increase siltation, which degrades salmon spawning habitat.