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5/21/2018 | 2:15 PM - 2:30 PM | NUTRIENT PROCESSING DOMAINS AS FUNCTIONAL SPACE FOR LOTIC ECOSYSTEMS: THE CASE OF THE UPPER CLARK FORK RIVER, MONTANA | 330 B

NUTRIENT PROCESSING DOMAINS AS FUNCTIONAL SPACE FOR LOTIC ECOSYSTEMS: THE CASE OF THE UPPER CLARK FORK RIVER, MONTANA

The propensity for stream ecosystem to lose or sequester nutrients has been assessed by contrasting the relative roles of transport and uptake across an array of factors. The nutrient processing domain (NPD) concept combines perspectives from wetland science, geomorphology, and stream ecology to propose that different streams, or discrete segments of streams, may occupy distinct realms in functional space characterized by magnitude (absolute rates), efficiency (rates as a percent of inputs), and character (dominant nutrient fate) of biogeochemical processing, manifesting in systems that may act as producers, transformers, compilers, or removers. In the Upper Clark Fork River, MT, river segments of 20-80 km were analyzed to address how they act as NPDs in the context of nitrogen (N) and phosphorus (P) loads. The most upstream reach acted as a producer (25 – 225 mg N/m2/d) across seasons while the reach immediately downstream functioned as a N compiler (net uptake of 10-40 mg N/m2 d), but a producer for P (5-15 mg P/m2/d), with compiler function quantitatively linked to upstream subsidies. Discerning how NPDs emerge and their consequences for longitudinal succession is relevant to conceptual and managerial models addressing stream biogeochemistry.

Hydrology
Nutrients
Aquatic-terrestrial Linkage

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Presenters/Authors

H. Maurice Valett (), University of Montana, Division of Biological Sciences, maury.valett@umontana.edu;