2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 3:00 PM - 3:15 PM | THE EFFECTS OF NUTRIENT LIMITATION ON THE TEMPORAL COUPLING OF NUTRIENT UPTAKE | 321
THE EFFECTS OF NUTRIENT LIMITATION ON THE TEMPORAL COUPLING OF NUTRIENT UPTAKE
Theory predicts that under nutrient replete conditions, nutrient uptake will occur only during photosynthesis, whereas under nutrient limitation, this uptake will occur during both day and the night equally, becoming decoupled from carbon uptake. To test this experimentally, we inoculated 20 experimental streams with biofilm-covered rocks and manipulated nutrient loading such that some streams were limited by nutrients, and others were not. We measured uptake over 24 hour periods and compared day and night uptake with GPP (photosynthesis). In the high nutrient streams, we observed day-night uptake differences that increased with GPP, whereas in the low nutrient streams, there was little to no observed difference between day and night uptake rates. The shift between these two behaviors occurs over a narrow concentration window, while other potential indicators of nutrient limitation such as GPP did not display such a strong division between high and low nutrient conditions. Diel variation in nutrient concentration may therefore serve as a useful diagnostic of nutrient limitation status.
- Limitation
- Nitrogen
- Stoichiometry
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Presenters/Authors
Catherine Chamberlin
(), Duke University, catherine.chamberlin@duke.edu;
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Emily Bernhardt
(), Duke University, ebernhar@duke.edu;
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Emma Rosi
(), Cary Institute of Ecosystem Studies, rosie@caryinstitute.org;
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Jim Heffernan
(), Duke University, james.heffernan@duke.edu;
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