Biogeochemistry I

Session 23 (Contributed)
Friday, May 30, 8:00 AM-9:45 AM, Athena CD
Moderator: Mulholland

8:00 (153) Dissolved nitrogen dynamics in a coupled stream-lake ecosystem during snowmelt quantified using 15-N nitrate.
M.A. Baker¹, R.O. Hall, Jr.², W.A. Wursbaugh¹, M.M. Bozeman¹, and C.D. Arp¹. ¹Ecology Center, Utah State University, Logan Utah, USA 84322, ²Dept. of Zoology and Physiology, University of Wyoming, Laramie, Wy, 82710

8:15 (154) Storage of nitrogen-15 nitrate during snowmelt in 2 mountain streams separated by a lake.
R.O. Hall, Jr.¹, M.A. Baker², W.A. Wurtsbaugh³, B. Koch¹, and C.D. Arp². ¹Dept. of Zoology and Physiology, University of Wyoming, Laramie WY 82071, ²Dept. of Biology, Utah State University, Logan, UT 84322, ³Dept of Aquatic, Watershed and Earth Resources, Utah State University, Logan, UT 84322

8:30 (155) Can a reservoir act as a nitrogen sink? The role of denitrification in NO₃^- retention within an agriculturally-influenced reservoir .
L.G. Wall¹, J.L. Tank¹, T.V. Royer², M.J. Kemp¹, and M.B. David². ¹Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, ²Depatment of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801

8:45 (156) Nitrate transport in agricultural streams: has denitrification been given too great a role?
T.V. Royer¹, J.L. Tank², M.J. Kemp², and M.B. David¹. ¹Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801, ²Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556

9:00 (157) The influence of land use on denitrification in headwater streams.
S.E. Eichler, J.L. Tank, and M.J. Kemp. Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA

9:15 (158) Denitrification associated with algal mats in nutrient-rich agricultural streams.
J.L. Schaller, T.V. Royer, and M.B. David. University of Illinois, Urbana, IL 61801

9:30 (159) Determination of denitrification rates in Walker Branch using a field ¹⁵N addition approach.
P.J. Mulholland¹, L.W. Cooper², S.A. Thomas³, H.M. Valett⁴, J.R. Webster⁴, and J.N. Houser¹. ¹Environmental Sciences Division, Oak Ridge National Lab., P.O. Box 2008, Oak Ridge, TN 37831, ²Dept. of Ecology and Evolutionary Biology, The University of Tennessee, Knoxville, TN 37932, ³Eco-Metrics Inc., 322 SW Third St., Pendleton, OR 97801, ⁴Dept. of Biology, Virginia Tech, Blacksgurg, VA 24061