Population Turnover in Wintering Bats in Indiana

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Abstract
The turnover in winter cave bat populations has not been adequately studied, although bat banders (Beer, 1955; Rysgaard, 1942; Griffin, 1940; Guthrie, 1933) are aware that hibernating concentrations do not remain constant throughout any given season. The extent to which the animals move in and out of their hibernating quarters poses an interesting problem. Such shifting is important in evaluating winter populations, banding returns, and perhaps sex ratios (one sex may tend to shift about more than the other). If it can be demonstrated that wintering populations fluctuate from day to day, or week to week, some of the seemingly low rates of band returns may be explained. It is conceivable that the wintering population, though remaining relatively constant with regard to total numbers, may actually be composed of an ever-changing group of individuals. Unless the bats are banded, such...

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