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The Use Of Tree Rings To Date Beaver Colonies, J. Benton Kettleson
The Use Of Tree Rings To Date Beaver Colonies, J. Benton Kettleson
Journal of the Minnesota Academy of Science
In 1946, I began the periodic observation of several beaver colonies located near my family's summer cabin, in Crow Wing Co., central Minnesota. From 1953 to 1956, a detailed study of the colonies was conducted as a Junior Academy of Science project. During this period, several new colonies were established and many of the older ones abandoned. A study of aerial photographs, followed by a ground check on foot or by canoe, turned up many other beaver colonies, some active at the time of discovery and many apparently long deserted.
In searching for a method of ascertaining when these workings …