2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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6/05/2017  |   11:15 AM - 11:30 AM   |  CHARACTERIZING THE TRANSFORMATION OF SPECIFIC DISSOLVED ORGANIC CARBON COMPONENTS IN PRAIRIE STREAMS   |  306A

CHARACTERIZING THE TRANSFORMATION OF SPECIFIC DISSOLVED ORGANIC CARBON COMPONENTS IN PRAIRIE STREAMS

The dissolved organic carbon (DOC) pool within a stream can be an important energy source for stream heterotrophs and the biological use and transformation of this pool is an important aspect of stream nutrient dynamics. DOC uptake has typically been calculated for broad DOC lability classes or simply for total DOC, potentially missing important information about processing rates of individual DOC constituents. We used reach-scale tracer experiments to follow the transformation of multiple DOC components from leaf leachate within a tallgrass prairie stream. We calculated individual uptake parameters for three distinct fluorescent components (one protein-like and two humic-like components) using excitation-emission matrices and parallel factor analysis, corrected for potential photolysis in the stream. The fastest uptake rate was calculated for the protein-like component. The humic-like components were taken out of the water column more slowly and did not return to background levels simultaneously with the conservative tracer, indicating adsorption and re-release. This technique allows for closer examination of the fate of specific DOC components within streams, including biotic and abiotic processes.

  • C10 Biogeochemistry
  • C32 Primary and Secondary Production
  • C31 Organic Matter Processing

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Presenters/Authors

Sophie A. Higgs (), Kansas State University, sahiggs@ksu.edu;


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Walter Dodds (), Kansas State University, wkdodds@ksu.edu;


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