Aquatic Sciences Meeting, Albuquerque 2001

SS21 Ultraviolet Radiation and the Aquatic Biota (Disciplinary Connections)

Date: Wednesday, February 14, 2001, Time: 10:15:00 AM

Location: Galisteo

Huot, Y, , Dalhousie University, Halifax, Canada, yhuot@is2.dal.ca

Peloquin, J, A, Smithsonian Environmental Research Center, Edgewater, USA, jillp@vims.edu

Neale, P, J, Smithsonian Environmental Research Center, Edgewater, USA, neale@serc.si.edu

Jeffrey, W, H, University of West Florida, Pensacola, USA, wjeffrey@uwf.edu

Cullen, J, J, Dalhousie University, Halifax, Canada, John.Cullen@dal.ca

Comparison of the effects of UV on bacterial and phytoplankton production using a modeling approach based on measured biological weighting functions

Twice during the summer of 2000, we determined biological weighting functions (BWFs) for the inhibition of bacterial (radiolabeled thymidine uptake) and phytoplankton (radiolabeled HCO3 uptake) production for natural assemblages from the Rhode River, a subestuary of the Chesapeake Bay. We use the BWFs and their associated kinetic models to compare the effect of UV on bacterial and phytoplankton production under different irradiance regimes (including cloud cover, water transparency and ozone levels) and wind mixing conditions, using a random walk model. Finally, comparisons are made between the predicted productivity based on the BWF models and in situ incubations conducted at the same location within a few days of the BWF experiment. As is generally the case when models are compared with measurements of UV effects in natural waters, uncertainties in the in situ measurements limit the degree to which the model can be validated.

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Aquatic Sciences Meeting, Albuquerque 2001

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