2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/07/2017 | 9:15 AM - 9:30 AM | BIOAVAILABLE DISSOLVED ORGANIC CARBON IN MID-ORDER STREAMS VARIES ACROSS GRADIENTS OF ANTHROPOGENIC SOURCES | 306A
BIOAVAILABLE DISSOLVED ORGANIC CARBON IN MID-ORDER STREAMS VARIES ACROSS GRADIENTS OF ANTHROPOGENIC SOURCES
Dissolved organic carbon (DOC) is a critical driver of heterotrophic stream processes, but not all DOC delivered to streams is of the same quality to microbes. Anthropogenic sources variably influence stream DOC quantity, but consistently increase the bioavailability of the DOC pool. We measured bioavailable DOC (BDOC) in mid-order streams in northeast Oklahoma and northwest Arkansas with 28 day incubation assays on water grab samples. Sites were chosen to span gradients of anthropogenic impacts to assess the influence of DOC source (e.g., pasture, forest, wastewater effluent) on DOC lability. DOC, and therefore BDOC, was below detection limits in forest-dominated streams. Streams with pasture-dominated catchments had variable but greater proportions of BDOC than forested catchments (0-20% of DOC removed during assays). Streams in urbanizing catchments with municipal wastewater discharges had consistently elevated BDOC (15-22%). These data were collected during a low flow event, and suggest that surface runoff may influence detection of land use patterns in stream DOC quality via export of low quantities of DOC. Sampling is occurring monthly to further investigate this relationship.
- C31 Organic Matter Processing
- C27 Landuse and Non-Point source Impacts
- C10 Biogeochemistry
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Presenters/Authors
Caleb J. Robbins
(), Baylor University, Caleb_Robbins@baylor.edu;
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Jeffrey A. Back
(), Baylor University, Jeff_Back@baylor.edu;
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Ryan S. King
(), Baylor University, Ryan_S_King@baylor.edu;
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