2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2018 | 10:15 AM - 10:30 AM | Dark matters: Consequences of color on riverine metabolism | 330 A
Dark matters: Consequences of color on riverine metabolism
Light availability is a fundamental driver of gross primary production (GPP) in streams and rivers. The amount of light that reaches the benthos is often uncorrelated to open sky irradiance due to attenuation by the surrounding canopy and discharge-related changes in water clarity. Hence, benthic light availability can vary substantially in space and time; yet few lotic metabolism studies have collected light data. We focus here on how well changes in water color can predict variation in GPP. We developed a rating curve to relate light extinction through the water column to fDOM measurements. By instrumenting rivers with both DO and fDOM sensors, we were able to estimate both GPP and benthic light at a high frequency. We found that the inclusion of benthic light greatly improved predictions of GPP as opposed to incoming or even stream surface light. The metric of benthic light allowed us to plot our blackwater systems on the same 4% photosynthetic efficiency line as our clear, spring-fed systems. Most notably, high color in blackwater streams and rivers drives GPP to zero, consequently allowing other processes to manifest in the DO signal.
- Light
- Primary Production
- Water Quality
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Presenters/Authors
Lily Kirk
(), University of Florida, lily33@ufl.edu;
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Matthew Cohen
(), University of Florida, mjc@ufl.edu;
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Robert Hensley
(), University of Florida, bhensley@ufl.edu;
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Philip Savoy
(), Duke University, prs15@duke.edu;
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