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Northern Brown Bears Discovered Feeding On Whitefish Runs

Date:
October 27, 2009
Source:
Arctic Institute of North America
Summary:
It is well documented that brown (grizzly) bears prey on major runs of salmon, charr and trout. In 2007, researchers were surprised to spot a brown bear caching whitefish near a stream in the Mackenzie Delta region of the Northwest Territories. This sighting has researchers advising increased care in petroleum extraction and infrastructure development within the area.

The discovery of brown (grizzly) bears feeding on migrating broad whitefish in a stream in Mackenzie Delta region of the Northwest Territories has researchers advising increased care in petroleum extraction and infrastructure development within the area.

In a paper published in the September issue of the journal Arctic, Oliver Barker and Andrew Derocher from the University of Alberta report seeing at least one brown bear engaged in the unusual activity of caching whitefish at Pete's Creek, a small Mackenzie River tributary located between Inuvik and Tuktoyaktuk. While it is well known that brown bears feed on salmon, trout and charr, this is the first scientific reporting of brown bears feeding on whitefish and supports what is recorded from local traditional knowledge.

Each spring since 2003, several bears were outfitted with satellite radio-collars. In October 2007, while conducting a helicopter survey of the bears, the researchers noticed two patches of disturbed ground near Pete's Creek. What they found when they landed surprised them – two caches with whole and partially eaten whitefish.

"My first impression was excitement. My second was apprehension," says Barker, "I don't like being in willow thickets when there are bears nearby."

Realizing their shotgun was in the helicopter, Barker beat a hasty retreat. Once in the air, they did indeed observe a young female nearby. "She was quite fat and shiny. Very roly-poly,'" recalls Barker.

Brown bears in the Mackenzie Delta face several challenges. Not only are food sources scarce, the bears are often active for just five months of the year. This creates extreme pressure for them to find adequate nutrition.

"These bears are real opportunists. They'll take advantage of different food sources," says Barker. This means some will turn to whitefish which are easily available in large numbers when they migrate in the fall. And although bears are omnivores and can exist on mostly vegetarian diets, fish are a better food source because they are rich in protein and fat.

Barker says the fall run of whitefish could be playing a significant role in the diets of some Mackenzie Delta brown bears. He would like to see more research conducted on the bears and their feeding habits, in order to mitigate the impacts of development activities.

"Pete's Creek may be an important but spatially concentrated food source, but we can't put it into context until we know more" says Barker. "It could take a small amount of disturbance in an area like this to disrupt these bears. There is still a lot we don't know about Mackenzie Delta bears, and any development should be mindful of such resources."


Story Source:

The above story is based on materials provided by Arctic Institute of North America. Note: Materials may be edited for content and length.


Cite This Page:

Arctic Institute of North America. "Northern Brown Bears Discovered Feeding On Whitefish Runs." ScienceDaily. ScienceDaily, 27 October 2009. <www.sciencedaily.com/releases/2009/09/090922123935.htm>.
Arctic Institute of North America. (2009, October 27). Northern Brown Bears Discovered Feeding On Whitefish Runs. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2009/09/090922123935.htm
Arctic Institute of North America. "Northern Brown Bears Discovered Feeding On Whitefish Runs." ScienceDaily. www.sciencedaily.com/releases/2009/09/090922123935.htm (accessed July 25, 2014).

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