2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 2:45 PM - 3:00 PM | THE IMPACT OF SUBSTRATE SIZE AND OTHER DRIVERS ON NUTRIENT UPTAKE ACROSS A FIVE-MONTH BIOFILM COLONIZATION SEQUENCE IN EXPERIMENTAL STREAMS AT ND-LEEF | 330 B
THE IMPACT OF SUBSTRATE SIZE AND OTHER DRIVERS ON NUTRIENT UPTAKE ACROSS A FIVE-MONTH BIOFILM COLONIZATION SEQUENCE IN EXPERIMENTAL STREAMS AT ND-LEEF
Headwater streams play a significant role in the removal and transformation of nutrients which can prevent or delay nutrient export, but partitioning the role of abiotic and biotic drivers controlling retention remains challenging in natural systems. We conducted short-term nutrient additions over a five-month biofilm colonization sequence (June-November) using four 50m experimental streams (Q=~1 L/s) at ND-LEEF, each lined with different substrate (D50: <1mm-5cm). It took two weeks of biofilm colonization for significant differences among streams to emerge; uptake velocities (Vf) for ammonium, nitrate, and soluble reactive phosphorus (SRP) were significantly different, suggesting benthic substrate size influenced nutrient uptake. Chlorophyll a was correlated with ammonium and SRP Vf, while benthic organic matter, as ash-free dry mass, was correlated with nitrate Vf. In November, we quantified changes in nutrient uptake after disturbance (i.e., manual sloughing of biofilm) at low (Q=0.9 L/s) and high discharge (Q=4.1 L/s). Post disturbance, we measured significant nitrate and SRP uptake at low Q, however, there was little measurable uptake at high Q for any solute. Our data suggest that the combination of substrate size, biofilm colonization, and discharge influence instream removal of ammonium, nitrate, and SRP.
- Primary Production
- Biofilm
- Biogeochemistry
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Presenters/Authors
Shannon Speir
(), University of Notre Dame, sspeir@nd.edu;
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Jennifer L. Tank
(), University of Notre Dame, tank.1@nd.edu;
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Arial Shogren
(), Department of Earth and Environmental Sciences, Michigan State University, shogrena@msu.edu;
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Martha M. Dee
(), University of Notre Dame, mdee@nd.edu;
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Matt Trentman
(), Flathead Lake Biological Station, University of Montana, matt.trentman@flbs.umt.edu;
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