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react to the use of copper sulfate. a chemical used primarily to control algal <br />populations in freshwater lakes. <br />Dr. Swain has also been cooperating in a project with the Limnological Research <br />Center at the University of Minnesota to determine the history of Lake Minnetonka <br />utilizing sediment analysis and dating. Dr. Swain will discuss the history of <br />manes activities around Lake Minnetonka as recorded in the bottom sediments lain <br />down year after year. The study of lake sediments, paleolimnology, can help <br />determine events that changed the water quality of the lake during the past 1500 years. <br />Dr. Swain received a B.A. in 1974 from Carleton College in Northfield. Minnesota, <br />and a Ph.D. in ecology from the University of Minnesota in 1984. He has been <br />extensively involved in sediment studies of lakes in Vermont, Hawaii, Northern <br />Minnesota and the Twin Cities. <br />Time will be available during the program for the audience to ask specific questions. <br />Cost is $2.00, payable at the door. The Gray Freshwater Biological Institute, <br />part of the College of Biological Sciences at the University of Minnesota, is <br />located at the intersection of County Roads 015 and 019 in Navarre. <br />* a � <br />