1:00 CONTROL OF DIN EXPORT FROM SMALL WATERSHEDS BY HEADWATER STREAM NITROGEN PROCESSING.
B.J. Peterson¹, W.M. Wollheim², P.J. Mulholland³, J.R. Webster⁴, J.L. Tank⁵, J.L. Meyer⁶, N.B. Grimm⁷, E. Marti⁷, W.B. Bowden⁸, J. Merriam⁹, H.M. Valett⁴, A.E. Hershey¹⁰, W.H. McDowell⁹, W.K. Dodds¹¹, S.K. Hamilton¹², S.L. Johnson¹³, L.R. Ashkenas¹³, and D.J. D'Angelo¹⁴. ¹The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA 02543, ²Complex Systems Research Center, University of New Hampshire, Durham, NH 03824, ³Environmental Science Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831-6036, ⁴Department of Biology, Virginia Tech University, Blacksburg, VA 24061, ⁵Department of Natural Resources and Environmental Sciences, N-411 Turner Hall, University of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801, ⁶Institute of Ecology, University of Georgia, Athens, GA 30602-2602, ⁷Department of Biology, Arizona State University, Tempe, AZ 85287-1501, ⁸Landcare Research, PO Box 69, Lincoln 8152, New Zealand, ⁹Department of Natural Resources, James Hall, Durham, NH 03824, ¹⁰Department of Biology, University of North Carolina - Greensboro, Greensboro, NC 27402, ¹¹Ackert Hall, Division of Biology, Kansas State University, Manhattan, KS 66506, ¹²Kellogg Biological Station, 3700 E. Gull Creek Dr., Hickory Corners, MI 49060, ¹³Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR 97331, ¹⁴The Proctor and Gamble Co., Experimental Stream Facility, 1003 Route 50, Milford, OH 45150-0356

1:15 AMMONIUM UPTAKE BY HETEROTROPHIC MICROBES, NITRIFIERS, AND ALGAE IN A MIDWESTERN U.S. STREAM.
S.K. Hamilton¹, J.L. Tank², D.F. Raikow¹, and W.M. Wollheim³. ¹Kellogg Biological Station, Michigan State University, Hickory Corners, MI 49060, ²Dept. Natural Resources and Envir. Sciences, University of Illinois, Urbana, IL 61801, ³Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, 02543

1:30 QUANTIFICATION OF THE NITROGEN CYCLE IN A PRAIRIE STREAM: KONZA LINX.
W.K. Dodds¹, M. Evans-White¹, N.M. Gerlanc¹, L. Gray², D. Gudder¹, M.J. Kemp¹, A. Lopez¹, D.M. Stagliano³, E.A. Strauss⁴, J.L. Tank⁵, M. Whiles³, and W.M. Wollheim⁶. ¹Division of Biology, Ackert Hall, Kansas State University, Manhattan, Kansas 66506, ²Department of Life Science, Utah Valley State College, 800 W. 1200 South, Orem Utah 84058, ³Department of Entomology, Waters Hall, Kansas State University, Manhattan, Kansas 66506, ⁴Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556, ⁵Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois, ⁶The Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543

1:45 ESTIMATES OF NITROGEN LOADING TO STREAMS USING IN-STREAM PROCESSING RATES.
W.M. Wollheim¹, B.J. Peterson², P.J. Mulholland³, J.R. Webster⁴, J.L. Tank⁵, J.L. Meyer⁶, N.B. Grimm⁷, E. Marti⁸, W.B. Bowden⁹, J. Merriam¹⁰, H.M. Valett⁴, A.E. Hershey¹¹, W.H. McDowell¹⁰, W.K. Dodds¹², S.K. Hamilton¹³, S.L. Johnson¹⁴, L.R. Ashkenas¹⁴, and D.J. D'Angelo¹⁵. ¹Complex Systems Research Center, University of New Hampshire, Durham NH 03824, ²Ecosystems Center, Marine Biological Lab. Woods Hole MA, 02543, ³Environmental Science Division Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831-6036, ⁴Department of Biology, Virginia Tech University, Blacksburg, VA 24061, ⁵Dept. Natural Resources and Env. Sciences, N-411 Turner Hall, University of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801, ⁶Institute of Ecology, University of Georgia, Athens GA, 30602-2602, ⁷Department of Biology, Arizona State University, Tempe, AZ 85287-1501, ⁸Centre d'Estudis Avangats de Blanes, Cami de Sta. Barbara s/n, Blanes (Girona) SPAIN , 17300, ⁹Landcare Research, PO Box 69, Lincoln 8152, New Zealand, ¹⁰Dept of Natural Resources, James Hall, Durham NH 03824, ¹¹Dept of Biology, University of North Carolina - Greensboro, Greensboro, NC 27402, ¹²Ackert Hall, Division of Biology, Kansas St. University, Manhatten KS 66506, ¹³Kellog Biological Station, 3700 E. Gull Cr. Dr., Hickory Corners, MI 49060, ¹⁴Dept. of Fisheries and Wildlife, Oregon St. University, ¹⁵The Proctor and Gamble Co. , Experimental Stream Facility, 1003 Route 50, Milford, Ohio 45150-0356

2:00 A COMPARISON OF NITROGEN PROCESSING IN THE P&G EXPERIMENTAL STREAM FACILITY WITH NATURAL STREAMS IN THE LINX STUDY USING STABLE ISOTOPES.
D.J. D'Angelo¹, S.C. Christman¹, B.J. Peterson², P.J. Mulholland³, C.S. Fellows⁴, J.L. Tank⁵, S.K. Hamilton⁶, E. Marti⁷, L.R. Ashkenas⁸, W.B. Bowden⁹, W.K. Dodds¹⁰, W.B. McDowell¹¹, J.L. Meyer¹², and J.R. Webster¹³. ¹The Procter & Gamble Co, Experimental Stream Facility, Milford, OH 45150, ²The Ecosystem Center, Marine Biological Laboratory, Woods Hole, MA 02543, ³Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 378313, ⁴Department of Biology, University of New Mexico, Albuquerque, NM 87131, ⁵Department of Natural Resources and Environmental Sciences, University of Illinois, N-411 Turner Hall, Urbana, IL, 61801, ⁶Kellogg Biological Station, Michigan State University, 3700 E Gull Creek Dr., Hickory Corners, MI, 49060, ⁷Department of Zoology, Arizona State University, Tempe, AZ, 85287, ⁸Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR, 97331, ⁹Landcare Research, PO Box 69, Lincoln 8152, New Zealand, ¹⁰Division of Biology, Kansas State University, 232 Ackert Hall, Manhattan, KS, 66506, ¹¹Department of Natural Resources, James Hall, University of New Hampshire, Durham, NH, 03824, ¹²Institute of Ecology, University of Georgia, Athens, GA, 30602, ¹³Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061

2:15 CONTROLS ON STREAM METABOLISM DETERMINED BY AN INTERBIOME COMPARISON STUDY.
P.J. Mulholland¹, C.S. Fellows², J.L. Tank³, S.K. Hamilton⁴, E. Marti⁵, L.R. Ashkenas⁶, W.B. Bowden⁷, W.K. Dodds⁸, W.H. McDowell⁹, J.L. Meyer¹⁰, B.J. Peterson¹¹, and J.R. Webster¹². ¹Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 37831, ²Department of Biology, University of New Mexico, Albuquerque, NM, 87131, ³Department of Natural Resources and Environmental Sciences, University of Illinois, N-411 Turner Hall, Urbana, IL, 61801, ⁴Kellogg Biological Station, Michigan State University, 3700 E Gull Lake Dr, Hickory Corners, MI, 49060, ⁵Department of Zoology, Arizona State University, Tempe, AZ 85287, ⁶Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR, 97331, ⁷Landcare Research, P.O. Box 69, Lincoln 8152, New Zealand, ⁸Division of Biology, Kansas State University, 232 Ackert Hall, Manhattan, KS, 66506, ⁹Department of Natural Resources, James Hall, University of New Hampshire, Durham, NH, 03824, ¹⁰Institute of Ecology, University of Georgia, Athens, GA, 30602, ¹¹Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, 02543, ¹²Department of Biology, Virginia Tech., Blacksburg, VA, 24061

2:30 NITROGEN PROCESSING AND RETENTION IN STREAMS (NPARS): PRELIMINARY RESULTS.
S.A. Thomas¹, H.M. Valett¹, J.R. Webster¹, P.J. Mulholland², and C.N. Dahm³. ¹Department of Biology, Virginia Tech, Blacksburg, Virginia, USA, 24060, ²Division of Environmental Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA, 37831, ³Department of Biology, University of New Mexico, Albuquerque, New Mexico, USA, 87131

2:45 NITROGEN CYCLE OF A FIRST ORDER PEATY TUNDRA STREAM.
M.K. Fox¹, B.J. Peterson¹, W.B. Bowden², A.E. Hershey³, K. Slavik¹, and C. Pruden². ¹The Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543 USA, ²Landcare Research, P.O.Box 69, Lincoln 8152 New Zealand, ³Department of Biology, University of North Carolina-Greensboro, Greensboro, North Carolina 27402 USA