2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2018 | 9:30 AM - 9:45 AM | SIMULATING INTERACTIVE EFFECTS OF PRIMARY PRODUCTION AND TERRESTRIAL ORGANIC MATTER SUBSIDIES ON STREAM ORGANIC CARBON SPIRALING | 321

SIMULATING INTERACTIVE EFFECTS OF PRIMARY PRODUCTION AND TERRESTRIAL ORGANIC MATTER SUBSIDIES ON STREAM ORGANIC CARBON SPIRALING

Despite recent advances in our understanding of inland waters as active players in the carbon cycle, most studies have not addressed the mechanisms behind larger-scale patterns. Consequently, quantifying how organic carbon (OC) is mineralized in streams and rivers is a necessary step toward a broader knowledge of the mechanisms controlling OC fluxes and fate. Here we link experimental data and model simulations to infer how non-additive interactions between algal- and terrestrially-derived OC (e.g., a priming effect) can alter stream OC spiraling. We ask: how do different organic matter compounds exported to and produced within streams/rivers interact to alter net OC transformations? Non-additive effects of mixed carbon sources on stream OC transformations can influence whole-ecosystem OC tracer uptake measurements, but are difficult to separate from OC metabolism and spiraling without single-source experiments and multi-source models. In recognition that many studies have failed to find conclusive evidence of a priming effect in freshwater ecosystems, we further explore a range of simulation scenarios to discuss the magnitude of non-additive responses needed to identify priming of OC transformations given rapid OC mineralization and high variation common to bioassay and in-stream solute dynamics.

Algae
Ecosystem
Carbon

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Presenters/Authors

Erin R. Hotchkiss (), Virginia Tech, ehotchkiss@vt.edu;