Wildlife crossings are a lifeline for Canada’s grizzly bears

2022-07-04 16:28:14

Carrying a GPS tracker fitted by researchers, the bear was noticed approaching the freeway time and time once more between the autumn of 2020 and spring of 2021, however at all times turning again. Till finally, he obtained fortunate, crossing the highway beneath a bridge north of the city of Drummond.

Lingenpolter’s story is just not a uncommon one. For animals that want area to roam, busy highways are a harmful impediment. In the event that they cross they threat being hit by a automobile, however not crossing can limit an animal’s vary, resulting in populations fragmenting and declining.

“(Highways) symbolize an actual barrier for all types of various wildlife,” says Jodi Hilty, president and chief scientist of Y2Y, an initiative that goals to preserve prime habitat throughout 2,000 miles of land between Yellowstone Nationwide Park within the US and Yukon in northwestern Canada. Connectivity is significant for a species’ survival — “to maintain their genetics, discover the sources they want, and assist preserve wholesome populations,” she provides.

One easy but efficient methodology to beat these obstacles is wildlife crossings — bridges or underpasses that present secure passage for animals throughout a freeway. Y2Y has helped to pioneer this method throughout its vary.

“When Y2Y began in 1993, there have been precisely zero wildlife crossing buildings. Right now, there are 117,” Hilty tells CNN.

In April, floor was damaged on the 118th — the Bow Valley overpass that may cross the Trans-Canada Freeway in Alberta.

Stress level

This freeway, which spans practically 5,000 miles, cuts by among the nation’s most scenic landscapes, together with the majestic Canadian Rockies and breathtaking Banff Nationwide Park — dwelling to grizzly bears, wolves, elks, deer and different wildlife.

In accordance with Y2Y, 22,000 automobiles use the highway every day, and this swells to greater than 30,000 in the summertime, when vacationers pour in to witness the area’s pure magnificence. However this intrusion of site visitors into the wilderness has led to excessive numbers of wildlife-vehicle collisions.

The Trans-Canada highway cuts through the stunning scenery of Alberta.

In a single 25-mile stretch of freeway, which has no fencing or wildlife crossings, Y2Y has recorded round 70 roadkills a 12 months — and the true quantity is more likely to be far increased as injured animals typically transfer off the highway and die later, says Hilty.

But in locations the place there are wildlife crossings and roadside fencing, roadkill has dramatically decreased. Take Banff Nationwide Park, the place there are 41 underpasses and 7 overpasses throughout a 55-mile stretch of freeway. Right here, wildlife-vehicle collisions have dropped by greater than 80% and, for elk and deer, by greater than 96%.

In addition to serving to animals, crossing “enhance security for folks,” says Jesse Whittington, a wildlife ecologist for Parks Canada, which manages Banff Nationwide Park.

Whittington has studied the impact of the crossings in and across the park for years. Digicam traps seize which animals are utilizing them, and radio collars connected to grizzlies and wolves have proven how crossings may help to allow long-range actions.

Footage from a camera trap shows a bear and its cubs using an underpass in Alberta.

Animals do not be taught the place a crossing is instantly, he says, however freeway fencing — with foundations constructed two meters underground, in order that animals cannot dig underneath it — helps to funnel them in direction of it. Over time, grizzlies and wolves be taught to make use of the crossings and so they go this information on to their offspring.

Since 1996, Parks Canada has documented animals utilizing overpasses and underpasses on 187,000 events, in line with Whittington — “an indication that these crossing buildings work.”

Banff Nationwide Park and the Y2Y undertaking have set an instance for others to observe, says Hilty.

“I actually hope that our mannequin will get picked up frequently, as a result of I believe that collectively we will be certain that each folks and nature can thrive,” she says.

Highways might be harmful locations for bears. Credit score: CNN

There are indicators of momentum. In 2021, the US authorities introduced its Infrastructure Funding and Jobs Act which can present $350 million over 5 years for the development of wildlife bridges, tunnels, fencing and different infrastructure. And in April of this 12 months, building started on the world’s largest wildlife crossing, which can span over 10 lanes of Freeway 101 in northwest Los Angeles, linking the Simi Hills with the Santa Monica Mountains and giving wild animals like cougars extra space to roam.

Hilty hopes the usage of wildlife crossings will change into normal follow throughout the planet. “We have to get to a degree the place when roads are busy, it turns into a part of regular societal follow that we create secure passage for wildlife,” she says.

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Supply by [tellusdaily.com]