2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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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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