2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
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
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Lily Kirk
(), University of Florida, lily33@ufl.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Matthew Cohen
(), University of Florida, mjc@ufl.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Robert Hensley
(), University of Florida, bhensley@ufl.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Philip Savoy
(), Duke University, prs15@duke.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -