2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/26/2021  |   8:30 AM - 10:30 AM   |  LOCAL AND REACH-SCALE ASSESSMENTS OF STRUCTURE AND FUNCTION: GRADIENTS OF NUTRITIONAL AND METABOLIC CHARACTER   |  Virtual Platform

LOCAL AND REACH-SCALE ASSESSMENTS OF STRUCTURE AND FUNCTION: GRADIENTS OF NUTRITIONAL AND METABOLIC CHARACTER

Classic assessments of river systems characterized longitudinal variation in community structure and ecosystem function as a result of systematic downstream changes in river attributes. However, differing perspectives of streams have since been introduced, many of which recognize the importance of both reach-, and local-scale assessments of ecosystem structure and function. Using two study sites along a 20-km reach of the Clark Fork River, MT, we demonstrate both local and reach-scale influences on stream character. Total nitrogen (N) and phosphorous (P) were greater at the upstream site at 0.11 ± 0.04 mg L-1 N and 0.28 ± 0.7 mg L-1 P, relative to 0.05 ± 0.03 mg L-1 N and 0.02 ± 0.01 mg L-1 P at the downstream site. N demand doubled from 0.0836 ± 0.02 to 0.174 ± 0.04 g N m-2 d-1 from the upstream to downstream sites. At the reach scale, the system acted as a sink for N over the duration of sampling with an effective uptake rate of -64.09 ± 0.98 mg NO3-N m-2 d-1. Together, point measures and reach-scale assessment suggest that local influences integrate over space to create longitudinal river function.

  • Biogeochemistry
  • Connectivity
  • Ecosystem Dynamics

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Presenters/Authors

Jacob Prater (), University of Montana, jacob.prater@umontana.edu;


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