HR: 1330h
AN: NB33F-06    [Abstracts]
TI: Simulating Nitrate Retention Patterns in Stream Networks: An Interbiome Comparison
AU: * Helton, A M
EM: amhelton@uga.edu
AF: Institute of Ecology, University of Georgia, Athens, GA 30602.
AU: Poole, G C
AF: Institute of Ecology, University of Georgia, Athens, GA 30602.
AU: Poole, G C
AF: Eco-Metrics, Inc., Tucker, GA 30084
AU: Meyer, J L
AF: Institute of Ecology, University of Georgia, Athens, GA 30602.
AU: Arango, C
AF: Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556
AU: Ashkenas, L R
AF: Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR 97331
AU: Dahm, C
AF: Department of Biology, University of New Mexico, Albuquerque, NM 87131
AU: Dodds, W K
AF: Divison of Biology, Kansas State University, Manhattan, KS 66506
AU: Gregory, S
AF: Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR 97331
AU: Grimm, N B
AF: School of Life Sciences, Arizona State University, Tempe, AZ 85287
AU: Hall, R O
AF: Department of Zoology and Physiology, University of Wyoming, Laramie, WY 82071
AU: Hamilton, S H
AF: Department of Zoology, Michigan State University, Hickory Corners, MI 49060
AU: Johnson, S L
AF: Pacific Northwest Research Station, United States Forest Service, Corvallis, OR 97331
AU: McDowell, W H
AF: Department of Natural Resources, University of New Hampshire, Durham, NH 03824
AU: Mulholland, P J
AF: Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
AU: Peterson, B J
AF: Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA 02543
AU: Tank, J L
AF: Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556
AU: Valett, H M
AF: Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
AU: Webster, J R
AF: Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
AB: Recent studies indicate that a substantial fraction of nitrogen input to the landscape may be stored or denitrified within stream networks, and that the rate of in-stream nitrogen removal decreases as stream size increases from 4th order to large rivers. We hypothesize that nitrate retention in small streams comprises a large component of nitrate retention in stream networks. To test this hypothesis, we are developing a model of interactions among stream size, in-stream nitrate processing, and nitrate transport in stream networks. In conjunction with the second Lotic Intersite Nitrogen Experiment (LINX2), this model will serve as a null model for an inter-site comparison of catchment-scale in-stream nitrate retention patterns among eight different biomes across the United States and Puerto Rico. Since nutrient retention patterns and mechanisms may vary among different landscapes, we expect that the model's predictive power will be substantially higher for some biomes than others. By comparing modeled and measured patterns of nitrate variability in stream networks across biomes, the inter-site comparisons will provide a basis for identifying variation in mechanisms that control nitrate processing across our study streams, a crucial step in understanding the fate of nitrogen delivered to stream networks.
DE: 4842 Modeling
DE: 4845 Nutrients and nutrient cycling
DE: 9901 NABS Student Award - Basic Research
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly