2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 2:45 PM - 3:00 PM | EFFECT OF TEMPORAL CHANGES IN PHOSPHORUS SUPPLY ON STREAM BIOFILMS AND PHOSPHORUS LIMITATION INDICATORS | 306B
EFFECT OF TEMPORAL CHANGES IN PHOSPHORUS SUPPLY ON STREAM BIOFILMS AND PHOSPHORUS LIMITATION INDICATORS
The effects of phosphorus (P) on freshwater systems is well-studied. However, the influence of storm runoff, sediment dynamics, and autotrophic and heterotrophic microbial metabolism on the P cycle in streams and rivers is poorly understood. The focus of this project was to evaluate how potential indicators of P limitation in stream biofilms in Fishing Creek near Bloomsburg, Pennsylvania respond to temporal changes in P supply. We measured alkaline phosphatase activity (APA), P uptake, biofilm polyphosphate concentrations, biofilm total P, chlorophyll fluorescence, and water column P concentrations twice a week throughout the summer of 2016. Results show a correlation between these indicators of phosphorus limitation and changes in phosphorus supply associated with drought and local storm events. In early summer, during a drought, APA and P uptake levels were high. As the frequency of storm events increased over time, higher streamflow and more sunlight increased chlorophyll fluorescence and P uptake and APA decreased, indicating nutrient saturation within the stream biofilms.
- C04 Microbial Ecology
- C10 Biogeochemistry
- C01 Algae & C24 Eutrophication
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Presenters/Authors
Jennifer Soohy
(), Bloomsburg University, jat18435@huskies.bloomu.edu;
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Aaron Gordon-Weaver
(), Bloomsburg University, amg43366@huskies.bloomu.edu;
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Steven Rier
(), Bloomsburg University, srier@bloomu.edu;
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