2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 2:45 PM - 3:00 PM | VARIATION OF FUNCTIONAL REDUNDANCY BETWEEN FUNCTIONAL PROCESS ZONES IN WESTERN NORTH AMERICAN STREAMS | 151 G

VARIATION OF FUNCTIONAL REDUNDANCY BETWEEN FUNCTIONAL PROCESS ZONES IN WESTERN NORTH AMERICAN STREAMS

Functional process zones are distinct hydrogeomorphic districts useful for explaining ecosystem function within the Riverine Ecosystem Synthesis. FPZs may be used to link ecosystem function across different scales in Macrosystem ecology. For example, macroinvertebrate functional traits should vary predictably across similar FPZs between ecoregions. Functional redundancy links taxonomic diversity to functional traits and is informative in studying resiliency. We hypothesized that FR would vary between low energy and high energy FPZs at different elevations. Data from the US EPA National River and Stream Assessment were analyzed for 103 western North American sites. Relatively undisturbed sites were selected for study from FPZs identified based on elevation, channel morphology, and stream velocity. Discriminant analysis was used to confirm categorization of sites into four FPZs. FR for three functional groups representing 18 traits were analyzed. FR was lowest in the low elevation, low energy sites and highest in the high elevation, low energy sites. On average FR varied significantly between the FPZs (ANOVA, F=6.14, p< 0.00). Our results indicate that the FPZs identified were discrete in terms of FR across large regions in western North American streams.

Biodiversity
Landscape
Geomorphology

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Presenters/Authors

Barbara Hayford (), University of Montana, bhayford@gmail.com;