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Patterns of prey selection by wolves in Denali National Park, Alaska

June 9, 2009

The patterns of selection by wolves (Canis lupus) preying on moose (Alces alces), caribou (Rangifer tarandus), and Dall sheep (Ovis dalli) in Denali National Park and Preserve, Alaska were studied from 1986 through early 1992. Wolves and their prey are legally protected or relatively unharvested in most of the area, and wolf numbers doubled during the study. Based on remains of 294 moose, 225 caribou, and 63 sheep, wolves killed calves and old adults disproportionately, and individuals with low marrow fat, jaw necrosis, or arthritis. Seasonal trends in proportions of various species, ages, and sex of kills were found. During the winters following winters of deep snowfalls, wolves greatly increased the proportion of caribou cows and calves taken. We conclude that in a natural system, wolves can survive on vulnerable prey even during moderate weather, and when snowfall exceeds average, they can respond by switching to newly vulnerable prey and greatly increasing their numbers.

Citation Information

Publication Year 1995
Title Patterns of prey selection by wolves in Denali National Park, Alaska
DOI
Authors L. David Mech, T.J. Meier, John W. Burch, Layne G. Adams
Publication Type Conference Paper
Publication Subtype Conference Paper
Series Title Occasional Publication of the Canadian Circumpolar Institute
Series Number 35
Index ID 5210738
Record Source USGS Publications Warehouse
USGS Organization Patuxent Wildlife Research Center