Climate Change Displacing Canada's Bison

It's a clear cut problem. Since 1986 lakes in Canada's north have doubled in area. That additional water has encroached on natural habitats including the Mackenzie bison preserve. This is being blamed for the migration of wood bison out of the Mackenzie preserve.

Lakes in the Mackenzie Bison Sanctuary off the northwest shore of Great Slave Lake are now bigger than any time in at least the last 200 years, said Josh Thienpont, a University of Ottawa scientist and a lead author on the paper, published Thursday in the journal Nature.

“The whole landscape does appear to be getting wetter,” he said.

Thienpont and his colleagues grew intrigued with the 10,000-square-kilometre sanctuary after people from Fort Providence, N.W.T., pointed out things were changing.

“Some of the local community had noticed that it was more difficult to travel on the landscape because it was wetter,” Thienpont said.

Thienpont and his colleagues examined satellite imagery of the area between 1986 and 2011. They found the proportion of the land covered by water had almost doubled, from 5.7 per cent of the total area to as high as 11 per cent.

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What’s happening in the sanctuary is unusual. Many northern areas are responding the climate change by getting drier, with lakes draining away as permafrost melts beneath them.

The sanctuary is a reminder that climate change impacts vary, said Thienpont.

“It shows that the same stressor can have varying impacts in different landscapes. It shows the responses of ecosystems are complex and the consequences of climate warming can impact every component of an ecosystem – not just the terrestrial, but also the animals living in an area.”