• Moroney, John F.
  University of Maine Graduate School
  

Biological, physical and chemical factors reach and interact within a river to provide a mosaic of environmental conditions within which certain organisms can exist. The alteration of these conditions by pollution may change the environment within specific areas creating less desirable habitats for the present organisms but more favorable habitats for other organisms. The objective of this study was to contribute to the establishment of an ecological base for the lower Penobscot River which would serve as a standard for measuring ecological responses to changes in the quality or quantity of pollution.