1:30 DENITRIFICATION IN THE UPPER MISSISSIPPI RIVER: POTENTIAL LIMITATION BY HYDRAULIC EXCHANGE AND NITRATE DELIVERY.
W.B. Richardson, E.A. Strauss, E. Monroe, L. Rabuck, L. Bartsch, and D.M. Soballe. Upper Midwest Environmental Sciences Center, U.S. Geological Survey, 2630 Fanta Reed Rd., La Crosse, Wisconsin, 54603, U.S.

1:45 DENITRIFICATION IN SOILS OF THE WISCONSIN RIVER FLOODPLAIN: PATTERNS AND POTENTIAL CONTROLS.
J.L. West and E.H. Stanley. Center for Limnology, 680 N. Park St, Madison, WI 53706

2:00 DENITRIFICATION IN SEDIMENTS FROM HEADWATER STREAMS IN THE SOUTHERN APPALACHIAN MOUNTAINS, USA.
L.A. Martin¹, P.J. Mulholland², J.R. Webster¹, and H.M. Valett¹. ¹Department of Biology, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061-0406, ²Oak Ridge National Laboratory, Environmental Sciences Division, P.O. Box 2008, Oak Ridge, TN 37831-6036

2:15 COMPARISONS OF NITRIFICATION AND DENITRIFICATION IN PRISTINE PRAIRIE AND AGRICUTURALLY INFLUENCED STREAMS.
M.J. Kemp and W.K. Dodds. Division of Biology, Kansas State University, Manhattan KS 66506

2:30 PHOSPHORUS BIOAVAILABILITY IN A MIDWESTERN AGRICULTURAL WATERSHED: FIELD TO STREAM.
L. Hatch, P. Brezonik, A. Feng, and D. Mulla. Water Resources Center, University of Minnesota, St. Paul, MN 55108

2:45 ACETATE STIMULATED DIN REMOVAL IN SEDIMENT PERFUSION CORES FROM POOL 8, UPPER MISSISSIPPI RIVER BASIN, LA CROSSE, WI: DENITRIFICATION POTENTIAL.
R.W. Sheibley III¹, A.P. Jackman¹, J.H. Duff², F.J. Triska², E.M. Godsy², and E. Warren². ¹Department of Chemical Engineering, University of California, Davis, CA 95616, ²U.S. Geological Survey, Water Resources Division, Menlo Park, CA 94025