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Students taking water samples at S-10 Auburn Fisheries pond, Auburn, Alabama. They are students of Alan Wilson and studying effects of excess nitrogen in this catfish pond.

Students taking water samples at S-10 Auburn Fisheries pond, Auburn, Alabama. They are students of Alan Wilson and studying effects of excess nitrogen in this catfish pond.

Students Michael Chislock, and Katie Lemay taking water samples at S-10 Auburn Fisheries pond, Auburn, Alabama. They are students of Alan Wilson and studying effects of excess nitrogen in this catfish pond. The is a bloom of microcystis, a non-fixing, colonial cyanobacteria.They took water from the pond and put it in separate floating trash cans and added varying amounts of nitrogen and phosphorus.
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42-51274935
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42-51274935
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June 29, 2011
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© Peter Essick/Aurora Photos/Corbis
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