Ecological Studies of the Wolf on Isle Royale - Annual Report (Covering the eighteenth year in the Isle Royale studies), 1975-1976
Peterson RO and Allen DL. 1976. Ecological Studies of the Wolf on Isle Royale - Annual Report (Covering the eighteenth year in the Isle Royale studies), 1975-1976. Michigan Technological University. Houghton, MI
In 1975, Isle Royale wolves produced at least 10-12 pups. The peak population of 44 wolves recorded in 1976 is the highest ever recorded on ISRO and represents the highest wolf densities documented anywhere. One instance of intraspecific strife recorded, resulting in the death of two wolves from a trespassing pack. 1976 kill rates were the highest recorded on ISRO over the past 18 years, with slightly more than one moose/day being killed by wolves. The Isle Royale moose population is undoubtedly decreasing, since calculated mortality rates have exceeded adult recruitment rates for the past three years. The authors best estimate of decline in the moose population over the last three winters is 20%, imploying a pre-parturition total of about 800 moose.
- Type
- Published Report
- Authors
- Peterson, Rolf; Allen, Durward
- Date of Issue
- 1976-04-30
- Publisher
- Michigan Technological University
- Units
- ISRO
- Keywords
- Aerial Survey, Beaver (Castor canadensis), Ecology, Gray Wolf (Canis lupus), Isle Royale National Park, Mammals, Michigan, Monitoring, Moose (Alces alces), Mortality, Predation