The project draws on the expertise and experience of NRRI's Center for Water and the Environment (CWE): JoAnn Hanowski Calling Bird Survey (CBS) data, a detailed study of bird species occurrence in different habitat types throughout Minnesota. This site covers some of the results from this work. Lucinda Johnson Amphibian communities. Amphibians are sensitive indicators of change in the environment. George Host, Mark White Natural Plant Communities - vegetation types that would naturally occur in different habitats. Carl Richards Stream quality.