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Relative Effectiveness of Four Different Guards In Preventing Beaver Cutting of Urban Trees
Cherie J Westbrook1, Kirby England2,3
1Department of Geography and Planning, University of Saskatchewan, Saskatoon, SK, S7N 5C8, Canada. cherie.westbrook@usask.ca.
Environmental Management
|May 9, 2022
Summary
Tree guards help protect urban trees from beaver damage, but effectiveness varies by type and proper installation. This study assessed various tree guards to inform better beaver management strategies.
Area of Science:
- Urban ecology
- Wildlife management
Background:
- Beavers are expanding into urban areas, leading to increased human-beaver conflicts.
- Management strategies are shifting towards controlling beaver foraging, with tree guards gaining popularity.
Purpose of the Study:
- To inventory tree guard types used in urban parks.
- To assess the effectiveness of different tree guards in protecting trees from beaver damage.
- To evaluate the impact of installation protocol adherence on tree guard effectiveness.
Main Methods:
- Inventoried four types of tree guards in urban river parks.
- Measured guard dimensions to assess adherence to installation protocols.
- Assessed the relative effectiveness of guards by determining the percentage of trees cut by beavers.
Main Results:
- 11% of trees with guards were cut by beavers, with variations among guard types.
- Type I and II guards were less effective (under 10% cut) than Type III and IV (17% cut).
- Proper installation adherence reduced tree cutting regardless of guard type, with Type II guards causing only minor damage.
Conclusions:
- Tree guard effectiveness varies by type and proper installation is crucial for beaver damage mitigation.
- Results inform the development of monitoring plans for tree guards in urban beaver management.
- Further research can refine tree guard selection and implementation for urban wildlife coexistence.
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