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Modeling the Sensitivity of Primary Production in Lake Michigan to Nutrient Loads with and without Dreissenid Mussels
ROWE, M. D., J. PAUER, P. A. DEPETRO, AND R. G. KREIS. Modeling the Sensitivity of Primary Production in Lake Michigan to Nutrient Loads with and without Dreissenid Mussels . Presented at International Association for Great Lakes Research, Cornwall, ON, CANADA, May 13 - 17, 2012.
To document research results
Dreissenid (quagga) mussels became established in large numbers in Lake Michigan beginning around 2004. Since then, significant changes have been observed in Lake Michigan open-water chlorophyll and nutrient concentrations, and in primary production. We updated the LM3-Eutro model to investigate the response of chlorophyll concentrations and primary production in Lake Michigan to nutrient loading scenarios with and without representation of dreissenid mussel filter feeding. LM3-Eutro is a high resolution (5-km horizontal, 19 sigma-layers) nutrient, phytoplankton, zooplankton, and detritus model. We made several improvements to the model: 1) updated daily N and P loads for 1994-2008, 2) an interactive sediment compartment for nutrients, 3) updated photosynthesis-irradiance curves, and 4) representation of dreissenid mussel filter-feeding effects. Mussel biomass and temperature-dependent filtration rate were specified, based on literature values. The model was calibrated and verified over the period 1994-2008 using available data. Model runs illustrate the sensitivity of chlorophyll and primary production to changes in nutrient loads with and without dreissenid mussels.
Record Details:Record Type: DOCUMENT (PRESENTATION/ABSTRACT)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LABORATORY
MID-CONTINENT ECOLOGY DIVISION
LARGE LAKES & RIVER FORECASTING RESEARCH