2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

5/26/2021 | 8:30 AM - 10:30 AM | Temperature effects on nutrient uptake in heterotrophic streams | Virtual Platform

Temperature effects on nutrient uptake in heterotrophic streams

Warming is expected to increase the rates of biological reactions in stream ecosystems, with unknown consequences for the linked cycling of carbon, nitrogen, and phosphorus. Nutrient uptake may increase proportionally to respiration with increases in temperature; however, if the carbon or nutrient use efficiency of microbial communities changes systematically with temperature, the relationship between nutrient uptake and temperature may deviate from that of respiration with temperature. We conducted a laboratory experiment to test whether the temperature sensitivities of respiration and nutrient uptake deviate in natural heterotrophic communities. We conditioned leaf litter in natural streams, brought the leaves into the laboratory, and measured the uptake of phosphorus across a range of temperatures (4-20 C) using dark-bottle incubations. We found that the temperature sensitivity of phosphorus uptake is considerably lower (0.40 eV) than that predicted for respiration (0.65 eV), suggesting that nutrient uptake rates may increase less than respiration rates with warming. Thus, as rates of carbon loss outpace increases in phosphorus uptake, we may expect relatively less phosphorus to be retained in forested headwater streams as they warm.

Ecosystem
Nutrient cycling
Nutrients

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Presenters/Authors

Nathan Tomczyk (), University of Georgia, nathan.tomczyk@gmail.com;