Aquatic Sciences Meeting, Albuquerque 2001

CS34 Trophic Dynamics

Date: Friday, February 16, 2001, Time: 10:00:00 AM

Location: Mesilla

O'Brien, W, J, University of North Carolina-Greensboro, Greensboro, USA, wjob@falcon.cc.ukans.edu

Hershey, A, E, University of North Carolina-Greensboro, Greensboro, USA, Anne_Hershey@uncg.edu

Kipphut, G, W, Murray State University, Murray, USA, george.kipphut@murraystate.edu

Miller, M, C, University of Cincinnati, Cincinnati, USA, mike.miller@uc.edu

LONG-TERM RESPONSES OF A PARTITIONED ARCTIC LAKE TO NUTRIENT ADDITIONS

As part of the Arctic LTER project we added inorganic N and P to the down stream sector of a divided lake from 1985 to 1990 and observed its recovery from 1991 to 1996. By 1990 the annual average phytoplankton was 4 times greater in the treated sector than in the reference sector. By 1996 the phytoplankton density was back to prefertilization levels. The density response of the 4 common zooplankton species was mixed. The benthic invertebrate response was also mixed with the common snail showing significantly increased density in the treated sector while chironomids did not. There was severe hypolimnetic anoxia from the first summer however there was no sediment phosphorus flux until 1989. The hypolimnetic anoxia continued through to 1996 but phosphorus flux ceased in 1995.

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Aquatic Sciences Meeting, Albuquerque 2001

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