2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 11:30 AM - 11:45 AM | DIFFERENTIAL RETENTION OF NITROGEN AND PHOSPHORUS IN LAKES | 306B
DIFFERENTIAL RETENTION OF NITROGEN AND PHOSPHORUS IN LAKES
As low points in the landscape, lakes integrate water and material from the surrounding landscape, and should be a reflection of their watersheds. However, lakes are variable in the stoichiometry of nitrogen (N) and phosphorus (P), even across lakes with similar watersheds. We hypothesized that variability in stoichiometry across lakes could be generated by internal, lake-specific differential retention of N and P. Nutrient retention for a given lake has been well-described by Vollenweider-type equations that show retention increases with residence time, but the underlying mechanisms and shapes of these relationships are different for N and P. An analysis of 710 lakes with published N and P budgets revealed that the most extreme lakes (shallow with short residence time, deep with long residence time) retained more N than P. However, most lakes (75%) retained more P than N, and median retention for P (38%) was nearly twice as high as N (20%). Landscape level patterns in lake stoichiometry may therefore be a function of both the chemical signatures of the surrounding landscape and lake-specific hydrology and morphology.
- C10 Biogeochemistry
- C24 Eutrophication
- S19 Elements and energy as fundamental currencies of nature: using ecological stoichiometry as a tool to advance the sustainability of freshwater ecosystems
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Presenters/Authors
Samantha K Oliver
(), University of Wisconsin Madison, skoliver@wisc.edu;
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Emily Stanley
(), University of Wisconsin - Madison, ehstanley@wisc.edu;
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