Jeff Cornwell

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Understanding the Influence of Bivalve
Suspension-feeder Populations on Water Quality in
Eutrophic Coastal Waters
Roger Newell
Horn Point Laboratory University of Maryland
Center for Environmental Science
Jeff Cornwell Raleigh Hood Evamaria Koch
Maryland Sea Grant Program Cooperative Institute
for Coastal Estuarine Environmental Technology
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Nitrogen
Phosphorus
Increase in Phytoplankton
Bloom
Die-off
Loss of Spawning and Nursery Grounds
Shading of SAV
Loss of Habital
Die-off of SAV
Surface Growth on Leaves
Anoxic Conditions
Oxygen
Decay
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Oyster Biodeposition Rates (Jordan 1987)
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Wet Meat Weight (kg x 106)
Time (years)
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Nitrogen
Shoreline Erosion
Phytoplankton
Dissolved Inorganic Nitrogen
Turbidity
Sediment
Metazoan Grazers and Microbial Loop
Water
Seagrass
Benthic Microalgae
Currents
Bivalves
Aerobic Sediment
Biodeposits
NH4
NO2-
Nitrification
NO3-
N2
NO2-
NO3-
Denitrification
Anaerobic
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dBsav /dt µm(1-e(-Iavg/Ik))Bsav - rBsav dS/dt
M(?b-?c) - wsS - CbSBbZbot Iavg f(depth,
seston, SAV) ?b f(wave height, depth, SAV)
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Change in Light Attenuation Associated with
Bivalve Feeding
Change in Kd 24h-1 g-1
Temperature 0C
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C. virginica
SAV biomass (shoots m-2)
M.mercenaria
Water depth (m)
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