Invasive species of plants, animals, diseases, and pathogens are estimated to cause more than $137 billion annually in damage to Americans in economic, ecological, and human health costs. Invasive species are best managed by preventing their establishment in the first place or by halting their spread to unaffected areas. But how? The USGS, NASA, and Colorado State University have teamed up to develop a tool to map invasive species and predict where they could be headed.
The cryptic and nocturnal habits of bats render it difficult to assess trends in the status of their populations. To meet this challenge, USGS biologists Mike Bogan and Tom O'Shea hosted an expert workshop to examine the topic of monitoring the status of bat populations. The proceedings are contained in a newly released report, “Monitoring Trends in Bat Populations of the United States and Territories: Problems and Prospects,” Information and Technology Report USGS/BRD/ITR—2003-003.