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Factors Affecting Ammonium Uptake In Streams - An Inter-Biome Perspective, Jackson R. Webster, Patrick J. Mulholland, Jennifer L. Tanks, H. Maurice Valett, Walter K. Dodds, Bruce J. Peterson, William B. Bowden, Clifford N. Dahm, Stuart Findlay, Stanley V. Gregory, Nancy B. Grimm, Stephen K. Hamilton, Sherri L. Johnson, Eugenia Marti, William H. Mcdowell, Judy L. Meyer, Donna D. Morrall, Steven A. Thomas, Wilfred M. Wollheim

Faculty Publications

The Lotic Intersite Nitrogen experiment (LINX) was a coordinated study of the relationships between North American biomes and factors governing ammonium uptake in streams. Our objective was to relate inter-biome variability of ammonium uptake to physical, chemical and biological processes. 2. Data were collected from 11 streams ranging from arctic to tropical and from desert to rainforest. Measurements at each site included physical, hydraulic and chemical characteristics, biological parameters, whole-stream metabolism and ammonium uptake. Ammonium uptake was measured by injection of '5~-ammonium and downstream measurements of 15N-ammonium concentration. 3. We found no general, statistically significant relationships that explained the variability …