2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 2:00 PM - 2:15 PM | HIGH SUPPLY, HIGH DEMAND: A UNIQUE NUTRIENT ADDITION DECOUPLES NITRATE UPTAKE AND METABOLISM IN A LARGE RIVER | 250 AB
HIGH SUPPLY, HIGH DEMAND: A UNIQUE NUTRIENT ADDITION DECOUPLES NITRATE UPTAKE AND METABOLISM IN A LARGE RIVER
Our current understanding of the relationship between nitrate (NO3-N) demand and supply in streams assumes that biological demand for nitrogen (N) remains constant in response to an N addition. This may be true on the scale of hours, but we hypothesize that over longer time (e.g., weeks to months, as with a sustained nutrient addition) biological communities may shift and increase demand in response to increased nutrient supply. To explore this, we treated a six-month controlled N waste release into the Kansas River (conducted by the City of Lawrence, KS) as an ecosystem-scale nutrient and microbial community addition experiment. We deployed four nitrate and dissolved oxygen sensor arrays along a 33 km study reach from January to May 2018 to continuously monitor diel NO3-N and stream metabolism. We evaluated the ratio of N supply to demand through time using the integrated diel NO3-N calculation method. We predict that supply:demand is largest at the start of a nutrient addition event, decreasing with time as the microbial community shifts. If true, this could change our understanding of N processing in streams that experience consistently high nutrient supply.
- Nitrogen
- Metabolism
- Microbial
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Presenters/Authors
Michelle Catherine Kelly
(), University of Kansas, michellekelly@ku.edu;
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Lydia Zeglin
(), Kansas State University, lzeglin@ksu.edu;
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Amy Burgin
(), University of Kansas, burginam@ku.edu;
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