2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 2:00 PM - 3:30 PM | ARE ANAEROBIC ENERGY-GENERATION PATHWAYS SIGNIFICANT CONTRIBUTORS TO STREAM ENERGY BUDGETS? | Virtual Platform
ARE ANAEROBIC ENERGY-GENERATION PATHWAYS SIGNIFICANT CONTRIBUTORS TO STREAM ENERGY BUDGETS?
While we focus on the aerobic processes of gross primary production (GPP) and ecosystem respiration (ER) to parameterize stream metabolism, we also know that anaerobic, energy-releasing processes are common in streams. Denitrification, which releases just 5% less free energy than aerobic respiration, is one such process. We ask: are anaerobic energy-generation pathways significant contributors to stream energy budgets? We measured denitrification (acetylene block) and aerobic metabolism in 25 study streams in the USA (NEON n=13, StreamPULSE n=12), modeling GPP and ER using a one or two-station inverse Bayesian approach. This dataset was supplemented with denitrification (15-N tracer) and metabolism from LINXII (n=28). Areal denitrification and ER rates were converted to rates of energy release using Gibbs free energy values. Total energy released was calculated as free energy from denitrification plus ER. Linear, nonlinear, and tree-based regression models, where the best fit model was determined by testing set performance, were used to determine which environmental variables were most important to predicting the proportion of the total energy budget released via denitrification. Preliminary results show denitrification contributing to as much as 9.6% of the total energy budget of a single stream. https://michelleckelly.github.io/StreamEnergyBudgets/
- Big data
- Nutrients
- Data science
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Presenters/Authors
Michelle Catherine Kelly
(), Michigan Technological University, mckelly1@mtu.edu;
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Erin Eberhard
(), Michigan Technological University , ekeberha@mtu.edu;
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Kevin Nevorski
(), Michigan Technological University, kcnevors@mtu.edu;
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Amy Marcarelli
(), Michigan Technological University, ammarcar@mtu.edu;
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