2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/07/2017 | 9:00 AM - 9:15 AM | METABOLISM IN AN AGRICULTURAL STREAM: EVEN IMPACTED RIVERSCAPES RETAIN LONGITUDINAL COMPLEXITY | 306A
METABOLISM IN AN AGRICULTURAL STREAM: EVEN IMPACTED RIVERSCAPES RETAIN LONGITUDINAL COMPLEXITY
Stream metabolism is an integrative measure of ecosystem function which responds to shifts in biomass, flow, temperature, and light. While metabolism is well understood in temperate systems, we know less about the spatial and temporal variability of metabolism in semi-arid regions. Marsh Creek, an agriculturally impacted stream in southeastern Idaho, is characterized by high turbidity, yet is also subject to large floating macroalgal blooms (<12% of stream surface area during peak growing season). We measured daily ecosystem metabolism at 6 locations along ~75 km of Marsh Creek to understand within-stream controls on metabolism over one year. Our initial results suggest different spatial and temporal drivers of metabolism. Despite our expectation that turbidity would dampen gross primary production, we found the highest rates of gross primary production in the most turbid site. However, within sites, GPP was negatively associated with turbidity. In spite of extensive stream modification and channelization, we find longitudinal heterogeneity in biomass production, sedimentation, and nutrient levels. Our results reveal that complex interactions drive stream metabolism, even in highly modified landscapes.
- C27 Landuse and Non-Point source Impacts
- S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
- C10 Biogeochemistry
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Presenters/Authors
Sarah Stalder
(), Idaho State University, stalsara@isu.edu;
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Rebecca Hale
(), Idaho State University, halereb3@isu.edu;
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Benjamin Crosby
(), Idaho State University, crosby@isu.edu;
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Colden Baxter
(), Idaho State University, baxtcold@isu.edu;
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