EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2018 | 11:30 AM - 11:45 AM | STOICHIOMETRY OF N, P, AND SILICA LOADING TO THE WESTERN BASIN OF LAKE ERIE: HYDROLOGICAL CONTROLS AND LIMNOLOGICAL IMPLICATIONS | 420 B
STOICHIOMETRY OF N, P, AND SILICA LOADING TO THE WESTERN BASIN OF LAKE ERIE: HYDROLOGICAL CONTROLS AND LIMNOLOGICAL IMPLICATIONS
The indicator of coastal eutrophication potential (ICEP) estimates the amount of non-siliceous algal production that could be supported by nitrogen (N) or phosphorus (P) available in excess of the stoichiometric requirement of diatoms. It often is viewed as a predictor of the occurrence and intensity of cyanobacterial blooms. We calculated ICEP using long-term (1975-2015) records of N, P, and silica (as Si) loads from the Maumee River, the major source of nutrients to the western basin of Lake Erie. Throughout the 40-year period of record, N inputs were far in excess of the N:Si ratio of 16:20 required by diatoms; lowest N:Si ratios occurred in drought years (e.g., 1988, 2012). The P:Si ratio also exceeded diatom requirements, but to a lesser degree than N:Si. The relationship between ICEP and average annual discharge indicated that flow conditions affected N and P loads far more than Si loads. Using the cyanobacterial index for the western basin of Lake Erie, we tested the ability of the ICEP to explain inter-annual variation in the abundance of cyanobacteria. Unexpectedly, ICEP was not correlated to the cyanobacterial index on an annual time scale.
- Nutrients
- Hydrology
- Algae
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Presenters/Authors
Todd V. Royer
(), Indiana University Bloomington, troyer@indiana.edu;
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Lienne Sethna
(), Indiana University, lsethna@iu.edu;
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James Hood
(), The Ohio State University, hood.211@osu.edu;
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