Feedback and Constraint on Heterotrophic Bacterial Growth in Aquatic Ecosystems

James Cotner. University of Minnesota, Dept. Ecology, Evolution and Behavior

Seminar at University of Minnesota-Duluth, Biology Dept. April 17, 1998

Abstract: Dr. Cotner has been studying interactions of microbes with nutrient cycles in freshwater and marine systems, small lakes, large lakes, estuaries and large oceans for 15 years. He is especially interested in the role of microbes in the structure and function of aquatic ecosystems. His work is focused on the effects of microbes on biogeochemical cycles, especially nitrogen, phosphorus and carbon. Because of their relatively high nutrient requirements, especially in oligotrophic systems, they are an important constraint on nutrient availability. His discussion at U of M-Duluth will examine the effects on heterotrophic bacteria on nitrogen and phosphorus dynamics in small lakes, the North Atlantic Ocean and some very recent work on the recurrent coastal plume in Lake Michigan. This latter work is associated with the NSF/NOAA jointly-funded EEGLE project and has relevance to the KITES project that is being funded for work on Lake Superior.