2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2019 | 3:00 PM - 3:15 PM | USING DIEL VARIATION IN DISSOLVED METABOLITES TO EXPLORE THE INFLUENCE OF NUTRIENT LOADING ON STREAM METABOLIC REGIMES | 251 DE
USING DIEL VARIATION IN DISSOLVED METABOLITES TO EXPLORE THE INFLUENCE OF NUTRIENT LOADING ON STREAM METABOLIC REGIMES
Point measurements of stream nutrient concentrations sampled exclusively during daylight hours provide a limited perspective on daily cycles of aquatic metabolic regimes and may mask areas of chronic loading due to sampling bias of periods with higher primary production. Our objective is to determine how chronic anthropogenic N loading influences diel variation in nutrient demand within the stream ecosystem metabolic regime by evaluating diel variation in concentrations of dissolved metabolites and continuous whole-stream metabolism estimates over an algal growing season. In our mountain headwater study area, stream ecosystems are likely to be nutrient-limited under natural conditions, but resort development in recent decades allows us to compare two similar stream reaches with contrasting N loading due to wastewater management practices. Diel patterns in nitrate concentrations demonstrate larger amplitudes in a reach with higher N loading. In general, chronic nutrient loads appear to influence nutrient demand via alteration of the stream metabolic regime. Continued examination of diel and seasonal cycles in metabolic behavior and inorganic nutrient concentrations in this setting will provide more detailed insight into the mechanisms by which stream metabolic regimes are influenced by anthropogenic nutrient loading.
- Nutrients
- Non-point Source
- Nitrogen
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Presenters/Authors
Meryl Storb
(), Montana State University, meryl.storb@gmail.com;
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Robert Payn
(), Montana State University, Montana Institute on Ecosystems, rpayn@montana.edu;
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Juliana D'Andrilli
(), Montana State University, juliana@montana.edu;
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