The Beaver of Isle Royale National Park, Michigan - First Annual Report, 1960
Shelton PC. 1961. The Beaver of Isle Royale National Park, Michigan - First Annual Report, 1960. Department of Forestry and Conservation, Purdue University. Lafayette, IN
This is the first summary report of a three-year study of the beaver and associated vertebrates of Isle Royale National Park. Emphasis is places on relationships of the beaver to the two most influential mammals on the island, timber wolves and moose. Presents a history of the beaver on Isle Royale. Present status of the beaver by aerial survey shows the presence of 29 active sites. At eleven other sites, a single beaver was seen or reported or fresh signs were found. There is some quantitative support to the contention that beaver numbers have declined drastically in the last 10 years. There is no indication of the role wolves have played in this decline. Young beaver were reported from only two sites. If it is true that young are seldom produced, this could indicate that a shortage of winter food is the major limiting factor. Food requirements of beaver and food availability is poorly understood.
- Type
- Published Report
- Authors
- Shelton, Philip
- Date of Issue
- 1961-03
- Publisher
- Department of Forestry and Conservation, Purdue University
- Units
- ISRO
- Keywords
- Aerial Survey, Beaver (Castor canadensis), eastern timber wolf (Canis lupus), Isle Royale National Park, Mammals, Michigan, Monitoring