14 Aug 2013:
Bears Using Wildlife Corridors
In Canadian Park, Genetic Tests Show
Genetic testing has revealed that bears in Canada’s Banff National Park routinely cross the bridges and underpasses along the Trans-Canada Highway
, evidence that the ecological corridors provide safe
A grizzly passes through a Banff underpass
passage along a busy roadway that otherwise threatens to fragment wildlife habitat
. Using 420 wire snag “hair traps” and 497 rub trees at 20 crossings to collect hair from passing bears, researchers from Montana State University determined that 15 individual grizzly bears and 17 individual black bears used the passages over a three-year period. According to researchers, those accounted for about 20 percent of the park’s bear populations, suggesting that the passageways are providing enough connectivity to maintain a healthy ecosystem for the bears and other large mammals. Twenty-five passages were installed during the 1990s
when the government widened the highway that crosses the country, including a 100-mile stretch that bisects Banff. “We knew that bears used the crossings, we just didn’t know how many,” said Tony Clevenger, a wildlife biologist and one of the authors of the study published in the journal Conservation Biology
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
e360 on Facebook
Donate to e360
View mobile site
Subscribe to our feed:
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
A Yale Environment 360
video explores Ecuador’s threatened Yasuni Biosphere Reserve with scientists inventorying its stunning forests and wildlife. Watch the video.
is now available for mobile devices at e360.yale.edu/mobile
The Warriors of Qiugang
, a Yale Environment 360
video that chronicles the story of a Chinese village’s fight against a polluting chemical plant, was nominated for a 2011 Academy Award for Best Documentary (Short Subject).
Watch the video.
Top Image: aerial view of Iceland
. © Google & TerraMetrics.
In a Yale Environment 360
video, photographer Pete McBride documents how increasing water demands have transformed the Colorado River, the lifeblood of the arid Southwest. Watch the video.