Monitoring Trends in Bat Populations of the United States and Territories: Problems and Prospects
Information and Technology rept.
GEOLOGICAL SURVEY FORT COLLINS CO BIOLOGICAL RESOURCES DIV
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Bats are ecologically and economically important mammals, but their populations are vulnerable to declines. Many species of bats in the United States and territories are endangered or threatened, have been candidates for such categories, or are species of concern. The importance and vulnerability of bat populations makes monitoring trends in their populations a goal for their management. However, scientifically rigorous monitoring of bat populations requires well-planned, statistically defensible efforts. This volume reports findings of an expert workshop held to examine this topic. Part I includes overviews of efforts at monitoring populations of bats in the U.S. and territories. These papers consider techniques and problems, and summarize what is known about the status and trends in selected groups of bats. Part I also includes a description of the bat monitoring program in the United Kingdom, a critique of monitoring programs in wildlife with recommendations for survey and sampling strategies, and an analysis of existing data on trends in bats in the U.S. and territories. In Part II, workshop participants critically analyze problems and make recommendations for improving methods, defining objectives and priorities, gaining mandates, and enhancing information exchange to facilitate future efforts for monitoring trends in U.S. bat populations.