Canids Interactions - Interspecific Conflicts

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Camera traps document polar, grizzly and black bears in same Arctic camp

Quote:Scientists say the surprise overlap of all three North American bear species challenges some of the most fundamental assumptions about conservation

This article was originally published on Mongabay.

In 1998, Douglas Clark witnessed Manitoba’s second recorded grizzly bear (Ursus arctos horribilis) sighting of the century.
Then a warden in Canada’s Wapusk National Park, he remembers swooping down near the shores of Hudson Bay in a Bell 212 helicopter to confirm the distinctive, muscular hump of a lone grizzly running along a gravel beach ridge.

Grizzlies had been considered extirpated in this sliver of the province since the late 1800s, and Wapusk — literally meaning “white bear” in Cree — was a land ruled by the polar bear (Ursus maritimus), an apex predator that was protected at all costs.

“Get down there with a trap and a rifle and get rid of that thing!” he recalls a senior park manager telling him.

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Douglas Clark initially aimed to collect data on polar bear visits to human-occupied areas in Wapusk National Park. Photo: University of Saskatchewan.

Grizzly sightings on this polar bear turf by researchers and locals increased over the next two decades. The lethal control approach has been touted by some conservation communities, with fears that grizzly bear range expansion would threaten polar bear populations.

Now, with recently captured camera trap footage showing grizzlies, polar bears and black bears (Ursus americanus) roaming the park in close proximity, Clark said he suspected his latest research may shift the conservation status quo in Canada’s ever-changing north.

“Many conservationists don’t look positively on the idea of environmental changes, especially when it affects high-profile species, like the polar bear,” Clark said.

“Grizzlies are the new kids on the block…so, it poses the question, is this change good or bad? And are we valuing polar bears more than grizzlies?”

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A lone grizzly passes by a camera trap in Wapusk National Park, appearing to be foraging for food. Photo: University of Saskatchewan.

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A grizzly inspects the team’s camera trap. There has been at least one grizzly bear sighting every year since 2008 in Wapusk National Park, but scientists do not yet know the extent or the drivers of their presence in what was previously polar bear country. Image: University of Saskatchewan.

A study led by Clark, published in Arctic Science, is the result of a chance encounter in 2011, when he returned to Wapusk as a conservation scientist with the University of Saskatchewan. Rigging a set of Reconyx heat- and motion-activated camera traps to the outposts of his research camp, Clark aimed to gather data for his studies on human-polar bear interactions.

However, one year in, while sifting through images triggered by park staff on snowmobiles, wandering birds and the occasional polar bear, he noticed an unexpected face wander across the frame: the first on-camera documentation of a grizzly in northern Manitoba.

Cameras snap species overlap
Shortly afterward, his team’s camera traps were picking up visits from black bears as well.

Although neither species was entirely new to the area, these snapshots were the first tangible evidence that polar bears weren’t the only carnivores to roam these lands, or perhaps, to even call them home.

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A black bear moves through the tundra of Wapusk National Park, Canada. Photo: University of Saskatchewan.

“It is and it isn’t surprising…Trappers have known about this for years,” Clark said. “But having these cameras out over time, we were able to show that it was more than one bear of all of the species and that it’s repeated. It’s not just one random bear wandering through.”

Set at 85 centimetres (2.8 feet) high, the cameras could not distinguish individual bears but used an infrared flash to count bear visits to a given camera by an individual or family of bears within a one-hour period. In six years of recording, the cameras have successfully captured 401 polar, grizzly and black bear visits at three camps within the park. More than 90 per cent of these visits were by polar bears.

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The camera traps are bolted to the fence posts of an approximate 15 x 30-meter (50 x 99-foot) camp compound in Wapusk National Park in northern Manitoba, Canada. Photo: Parks Canada.

The trap setup consists of four cameras facing each of the cardinal directions around the perimeter of each camp, and one additional camera for redundancy. The team lucked into a trap arrangement — in terms of height, location and distance apart — that could adequately capture the trio of species, and so its positioning has remained essentially untouched to this day.

Although no interspecies interactions have emerged, one set of photos captured a polar bear and a black bear passing by the same camera some three hours apart from one another.

It’s likely, Clark says, that this narrow time frame indicates these bears were aware of each other and could quite possibly be adapting to the other’s presence. Other footage has prompted the team to suspect that some grizzly bears are even denning in the area and not just passing through.

The politics of polar bear conservation
“Suddenly, this takes us into the terrain of values,” Clark said, “and it forces us to really take a hard look at bear and park conservation in an area where a bunch of ecosystems converge, and in a time where all of these ecosystems are changing very rapidly as a result of climate change.”

How best to approach this influx of non-native predators is a question that remains unanswered. The common approach to conservation, within national parks especially, is to preserve an environment in its known state. But as much of Canada’s subarctic regions rapidly thaw and evolve, this approach becomes less realistic and more difficult to achieve. To ensure a thoughtful approach, Clark says, undoubtedly involves the local people, who harbour a deep knowledge of the land and the ecological changes it’s undergone.

However, many residents of northern Manitoba are at odds with the initiatives of polar bear conservationists and researchers, as local perspectives have historically been cast aside or, in some cases, ignored entirely. For example, researchers have fitted bears with tracking tags to understand their movements, but many communities consider the tags an interference with local hunting traditions and insulting to the bears who, in some cultural views, are considered to be non-human persons.

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According to Parks Canada, Wapusk National Park has one of the highest known concentrations of polar bear maternity dens in the world. Image: University of Saskatchewan.

“The politics of polar bear conservation has been going bad for about 14 years. Conservation-wise, policy-wise, wildlife management-wise, it’s a train wreck,” Clark said. Northern Canada has been the epicentre of debates surrounding these matters, often between researchers and media, who put polar bears on an ecological pedestal, and Indigenous peoples for whom polar bears are a primary resource.

Indigenous knowledge and science ‘often tell the same story’
Chris Darimont is an interdisciplinary conservation scientist with the University of Victoria and the Raincoast Conservation Foundation who has conducted much of his research in partnership with Indigenous governments along Canada’s west coast. Darimont promotes the fusion of scientific methods with traditional wisdom and management strategies.

“Management intervention that isn’t carefully considered has a track record of making things worse,” Darimont said. Indigenous communities, he said, had managed natural resources for thousands of years in a way that was inherently sustainable and woven into their culture.

Government agencies, lacking that kind of relationship and working with limited knowledge, are “more likely to commodify resources,” Darimont said.

Generally, in Darimont’s experience, Indigenous governments on the west coast have values that align with those of area conservationists. “We find that [Indigenous knowledge and science] are frequently complementary. They often tell the same story, perhaps in slightly different ways,” he said.

“But Indigenous knowledge might, for example, provide things that science cannot, and vice versa.”

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A polar bear snacking on snow. Image: University of Saskatchewan

A study co-authored by Darimont and fellow researchers in 2014 successfully combined these two schools of knowledge. Noticing an increase in grizzly bear sightings throughout the archipelago off British Columbia, his team deployed camera traps and non-invasive hair-snagging sites to track bear movements and genetics.

“We combined our photographs and genetic detections with interview data from elderly knowledge holders in two [First Nations] communities on the coast,” Darimont said. “What that did is give us data that our Western science data could never do, and that is, go back in time. What we couldn’t do is put remote cameras on these islands 60 years ago, so each knowledge source provided something the other knowledge source couldn’t … it was a pretty powerful story.”

Clark, too, said he hoped to further marry camera trap data collection with the expertise of local people in northern communities. “You can combine the robustness of the cameras with the ingenuity and knowledge that the local people have about the land that they live on,” he said. “This also gives them a way to gain a voice and some real traction in these debates about bear conservation that really do affect them a great deal.”

Rethinking conservation assumptions
In his next phase of bear conservation research, Clark plans to arm communities in northern Manitoba and Nunavut with camera traps of their own. His off-the-shelf Reconyx suite has provided a reliable view of the changing landscape. So far, however, he’s been able to capture only snapshots within the cameras’ 25-meter (82-foot) sensor range, and his curiosity of what lies beyond camp perimeters has prompted him to continue documenting the tale of the three bears in Wapusk National Park.

Clark said he thinks the information gained in Wapusk can help the conservation community around the world grapple with parallel situations. “Preserving a steady-state environment in the subarctic on the coast of Hudson Bay, or probably pretty much anywhere, is no longer an option,” he said.

“These doctrines and these assumptions in orthodox conservation thinking are really powerful, very deep-seated and hard to dislodge. Yet, the world is now forcing us dislodge them if we’re going to be able to do anything effective on the conservation front, now and in the future.” Reply