WTI is conducting a research on behalf of the Wyoming Game and Fish Department (WGFD) and the Wyoming Department of Transportation (WYDOT) to explore mitigation options for reducing wildlife vehicle collisions along Interstate 25 in central Wyoming. WYDOT and WGFD would like to explore the possibility of funneling large mammals, particularly mule deer and pronghorn, through the existing underpasses on this section of road rather than building new ones specifically designed for wildlife.
As one of the research steps, project researchers Marcel Huijser, Amanda Warren, and Elizabeth Fairbank collected preliminary data on wildlife use of existing structures under I-25 which were not originally designed for wildlife. Based on an eight-month monitoring effort in 2018-2019, the research team found that the structures are predominantly used by mule deer and white-tailed deer, but almost never by pronghorn. More details are available in the interim report (“Preliminary Data on Wildlife Use of Existing Structures along I-25, Kaycee, Wyoming, USA”), which was recently published and is available on the project page of the WTI website.
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
The business website Quartz (www.qz.com) has published a feature article on the international use of wildlife crossing structures. “Wildlife overpasses that protect animals are spreading globally” discusses WTI Road Ecologist Tony Clevenger’s findings on the types of crossings preferred by different species of animals, based on his research on the Trans-Canada Highway. It also mentions Road Ecology Program Manager Rob Ament’s efforts to help countries like Bhutan to start using wildlife crossings to protect species like Asian elephants.
Interested in hearing Tony Clevenger speak on wildlife overpasses in more detail? Check out his radio interview from last week with Marcus Smith on BYU radio, entitled “Highway overpasses paved with grass, rocks and trees save lives.”
Smokies Life, the magazine of the Great Smoky Mountains Association, has published a pictorial feature and in-depth article on wildlife collisions. “Right of Way: Roads Need Overhaul to Decrease Collisions” includes an interview with WTI Road Ecologist Marcel Huijser about his 20 years of research on the effectiveness of wildlife crossing structures. The article also features a number of Marcel’s personal photos from the U.S. 93 wildlife crossings project in Montana.