Habitat issues for endangered, threatened, or invasive species, and species of concern, using GIS as an ecological tool at various landscape levels. Habitat studies for the Indiana bat (Myotis sodalis), Eurasian tree sparrow (Passer montanus), and River Otter (Lutra canadensis), and ecological studies for pin oak (Quercus palustris) and decurrent false aster (Boltonia decurrens).