Diet of Grey Wolves (Canis lupus) During Calving in a Moose– Caribou System in Northern Ontario

• Published in: The Canadian Field-Naturalist
• Main Authors: Found, Rob, McLaren, Ashley A. D., Rodgers, Arthur R., Patterson, Brent R.
• Format: Article in Journal/Newspaper
• Language: English
• Published: The Ottawa Field-Naturalists' Club 2018
• Subjects: Grey Wolf; Canis lupus; canids; Woodland Caribou; Rangifer tarandus; Moose; Alces americanus; American Beaver; Castor canadensis; diet; scat; predation; human disturbance; prey selection; northern Ontario
• Online Access: https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/1822; https://doi.org/10.22621/cfn.v131i3.1822

Grey Wolves (Canis lupus) are a leading proximate cause of declining populations of Woodland Caribou (Rangifer tarandus), a threatened species. Although predation on adult caribou has been well documented, less is known about predation on neonatal calves. We used scat analysis to examine the diet of wolves in an area of Ontario overlapping the receding southern limit of caribou occurrence. Wolves consumed mostly Moose (Alces americanus; 82.7%), followed by American Beaver (Castor canadensis; 10.9%), caribou (3.1%), and Snowshoe Hare (Lepus americanus; 1.5%). This low use of caribou is consistent with other evidence suggesting that caribou are a minor dietary component of wolves in this system; however, because most caribou consumption consists of calves, the impact on this slowly reproducing species may still be significant.