NEW REPORT: Hot Spot Analysis of Large Mammal-Vehicle Collisions in California

Two deer crossing guard rail and road on Hwy 191 approaching Jackson Hole, WY.The final report is now available for a wildlife vehicle collision study conducted for the California Department of Transportation.  Road Ecology Research Ecologist Marcel Huijser and Research Associate James Begley authored the final report for “Large Mammal-Vehicle Collision Hot Spot Analysis,” which provides guidance on the implementation of mitigation measures aimed at reducing collisions with large wild mammals along all state managed highways in California, with an emphasis on mule deer. These analyses identified the road sections that had the “highest” concentration of deer-vehicle crashes and mule deer carcasses. The hot spots were prioritized based on parameters related to human safety, biological conservation, and economics. Finally, the researchers provided practical guidelines for the implementation of mitigation measures and suggest mitigation strategies for the highest-ranking hot spots in each Caltrans district.

The report is available on the Hot Spot Analysis project page of the WTI website.

New Publication: How do wildlife fencing and crossing structures affect small mammals?

While wildlife fencing and crossing structures have been shown to reduce the effect of roads on medium and large animals, less is known about how these structures affect the movements of small mammals.  The Canadian Journal of Zoology has published “Factors affecting the permeability of road mitigation measures to the movement of small mammals,” an article by Adam Ford and WTI Research Scientist Tony Clevenger, based on research they conducted on four small mammal species along the Trans-Canada Highway Corridor in Banff National Park.  The article includes recommendations for culvert design and maintenance to promote usage of these structures by small mammal species to cross highways.

Citation: Ford, Adam T. and Clevenger, Anthony P. Factors affecting the permeability of road mitigation measures to the movement of small mammals. Canadian Journal of Zoology, 2019, 97(4): 379-384, https://doi.org/10.1139/cjz-2018-0165

NEW PUBLICATION: Idaho Barn Owl Study Explores High Rates of Road Mortality

Ibis, an international journal of avian science, has published an article based on a WTI Road Ecology project in Idaho.  “Spatial, road geometric and biotic factors associated with Barn Owl mortality along an interstate highway” studied the high rates of collisions between Barn Owls and vehicles on Interstate 84 in Southern Idaho.  It stems from a WTI project on potential mitigation options for reducing vehicle collisions with barn owls, which was a collaborative research effort among WTI, Boise State University, Murdock Charitable Trust, Federal Highway Administration, Idaho Transportation Department and Idaho EPSCoR.  Angela Kociolek served as the Principal Investigator.

Citation: Arnold, E. M., Hanser, S. E., Regan, T. , Thompson, J. , Lowe, M. , Kociolek, A. and Belthoff, J. R. (2019), Spatial, road geometric and biotic factors associated with Barn Owl mortality along an interstate highway. Ibis, 161: 147-161. doi:10.1111/ibi.12593

New Report: National Key Deer Refuge – Strategies for Reducing Wildlife Vehicle Collisions

WTI has released a new report investigating Key Deer mortality along a segment of Highway 1 within the National Key Deer Refuge in Florida. Road Ecologists Marcel Huijser and James Begley found that 75% of all reported mortalities in this area were related to collisions with vehicles.  The team also investigated and mapped how the locations of collision “hotspots” have changed since the installation of wildlife fencing, underpasses, and deer guards. The final report (“Exploration of opportunities to reduce Key Deer Mortality along US Highway 1 and other roads, National Key Deer Refuge, Florida, USA”) summarizes the pros and cons of eight different strategies aimed at reducing collisions with Key Deer on Highway 1.

The National Key Deer Refuge final report is now available on the WTI website.  This research effort is part of a technical support contract for National Wildlife Refuges, which encompasses projects at refuges across the country.