2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 10:00 AM - 10:15 AM | MACROSCALE PATTERNS OF FACTORS CONTROLLING RIVER METABOLISM IN THREE TEMPERATE STEPPE RIVER BASINS | 302B
MACROSCALE PATTERNS OF FACTORS CONTROLLING RIVER METABOLISM IN THREE TEMPERATE STEPPE RIVER BASINS
Large rivers of the temperate steppe provide key habitats and water resources. We can characterize the trophic status of river reaches through estimation of riverine metabolism represented by gross primary productivity (GPP), ecosystem respiration (ER), and net ecosystem production (NEP). We anticipated increased GPP and autotrophic respiration with a corresponding decrease in heterotrophic respiration along the upstream to downstream, high to low energy, and narrow to wide gradients. We collected diel oxygen, temperature, light, and geo/hydromorphologic data in three large temperate steppe watersheds distributed broadly across the Western United States, and used a single-station Bayesian model to estimate GPP, ER, and aeration (k) from 41 stream sites in several functional processing zones. The model struggled to fit upland high energy sites with highest aeration and GPP>>ER. Upland sites exhibited more variable GPP, ER, K, and net ecosystem productivity (NEP) than lowlands. Our results unexpectedly indicated that upland low energy sites exhibited higher aeration than lowland high energy sites. Our data suggest a hybrid functional processing/ river continuum model applies to macro-scale patterns of river metabolism.
- C32 Primary and Secondary Production
- C31 Organic Matter Processing
- S29 Macrosystem Ecology of Aquatic Systems
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Presenters/Authors
Anne Schechner
(), Kansas State University, anneschechner@ksu.edu;
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Walter Dodds
(), Kansas State University, wkdodds@ksu.edu;
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Sudeep Chandra
(), Global Water Center and Biology Department, University of Nevada, Reno, sudeep@unr.edu;
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