2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/21/2018  |   9:30 AM - 9:45 AM   |  RESPONSES OF LAKE ERIE PHYTOPLANKTON COMMUNITIES TO PHOSPHORUS, NITROGEN, AND SILICA LOADING FROM THE MAUMEE RIVER   |  420 B

RESPONSES OF LAKE ERIE PHYTOPLANKTON COMMUNITIES TO PHOSPHORUS, NITROGEN, AND SILICA LOADING FROM THE MAUMEE RIVER

Phytoplankton dynamics in the Western Basin of Lake Erie are strongly associated with phosphorus (P) loading. Yet, we have a limited understanding of how climate and nutrient loading interact to shape intra-annual phytoplankton dynamics, particularly for non-cyanobacteria taxa. Here, we present analyses of a 20-year phytoplankton biomass time series (1995-2015) from a site in the Western Basin of Lake Erie. We asked how P, nitrogen, and silica loading from the Maumee River shapes inter- and intra-annual phytoplankton community dynamics. Multivariate ordination separated phytoplankton communities into two axes: one associated with the relative biomass of cyanobacteria and another associated with diatoms and Cryptophytes. Cyanobacterial biomass, which increased between 1995 and 2015, exhibited strong seasonality and was positively related to the ratios of bioreactive P to total P and nitrate to bioreactive P. The relationship among cyanobacterial biomass, day of year, and nutrient loading changed between the first and second decade of this time series, indicating the potential for a regime shift. Our results suggest that the influence of nutrient loading on phytoplankton community dynamics is complex, temporally variable, and dependent upon the stoichiometry of multiple chemical species.

  • Nutrients
  • Phosphorous
  • Stoichiometry

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Presenters/Authors

James Hood (), The Ohio State University, hood.211@osu.edu;


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Lienne Sethna (), Indiana University, lsethna@iu.edu;


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Todd V. Royer (), Indiana University Bloomington, troyer@indiana.edu;


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