Beavers, and their unique engineering ability to enhance and maintain watershed health and complexity, are increasingly heralded as a natural solution to ecosystem degradation caused by numerous anthropogenic pressures including climate impacts. Currently, beaver-focused monitoring before and after pertinent restoration action is sometimes recommended but not required nor even described; rather, a focus on fish and stream ecological monitoring is often deemed adequate and an examination of outcomes for beaver ignored. As a result, the feasibility of basic monitoring activities, as well as detailed protocols and plans that focus on beaver are lacking, creating a barrier to their prioritization and application by an array of relevant practitioners. Ultimately, opportunities are lost for adaptive management, tracking trends, formulating best practices and improving conservation outcomes for beavers, which in turn may enhance ecosystem conservation.
In collaboration with University of Washington students and advisors from the US Forest Service, Tulalip Tribes and Stillaguamish Tribe, this project developed, tested and implemented a user-friendly and inexpensive monitoring protocol to confirm beaver presence/occupancy in northwest forested ecosystems when impactful restoration action occurs. Such monitoring is not yet routine and its instruction is not readily available; the work of this project fills this gap. A research team that included two undergraduate students first performed a review of peer-reviewed scientific literature from 2004-2024 that involved monitoring beaver to identify the variety of methods applied for determining beaver presence, abundance, and/or life history variables, including dispersal and other movement behavior. Of the 15 methods identified in 89 studies, six were most commonly applied (77% of the studies). These common methods were described in detail, including their limitations, and example articles were identified as suitable references for practitioners wishing to launch new beaver monitoring programs.
Based on the literature review, a field protocol was developed that combined two approaches for confirming beaver presence along stream reaches when it is uncertain if beaver structures (e.g., dams, lodges, bank dens) are active or abandoned. Experts in beaver conservation and management were also consulted and their comments and advice incorporated to improve both the review and protocol. The protocol, which involves beaver sign surveys within 100m of a waterway’s banks and arrays of 1-4 camera traps near beaver-made structures, was stress-tested and refined through implementation for eight weeks at two sites in Rollins Creek, Snohomish County, WA where beaver activity had been observed in the past. This validated a user-friendly monitoring protocol for tracking beaver occupancy and density in northwest forested ecosystems, providing a much-needed resource to evaluate beaver populations for stakeholders who relocate or enhance habitat for beaver, or who aim to coexist with beaver on their own land. A final report containing the literature review, field study findings and final protocol was developed and distributed to wildlife managers at state government agencies and Tribes, and other practitioners concerned with restoring beaver numbers in Washington State. ($20,000)