2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 10:15 AM - 10:30 AM | NUTRIENT AND TRACE METAL CO-LIMITATION OF ALGAL BLOOMS IN THE GREAT LAKES | 420 B
NUTRIENT AND TRACE METAL CO-LIMITATION OF ALGAL BLOOMS IN THE GREAT LAKES
Efforts to reduce the frequency and extent of harmful algal blooms (HABs) require knowledge about factors that control algal growth and toxin production. While labile N and P fuel primary production, micronutrients (Fe, Zn, Ni, Mo) form the enzymatic engines that promote rapid and efficient growth and toxin production. In summer 2017, we completed in-situ nutrient enrichment experiments with both single and combinations of elements using diffusing substrates. Enrichment experiments were replicated at 10 locations near rivermouths in Lakes Michigan and Erie that encompassed sites with little algal biomass and those with active HABs. Preliminary analysis suggests significant inter-site variation in nutrient limitation of biomass; no nutrient limitation was most common (6 sites), and biomass at both active bloom and oligotrophic sites was not nutrient limited. Co-limitation of N and P (2 of 10 sites) and co-limitation with trace metals (2 of 10 sites) were equally common. Preliminary data suggest that microcystin concentrations in algae are decoupled from biomass response to enrichment. These data demonstrate that a multi-nutrient view of elemental requirements is needed to understand the drivers of HABs in the Great Lakes.
- Metal
- Algae
- Limitation
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Presenters/Authors
David Costello
(), Kent State University, dcostel3@kent.edu;
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Jordyn Stoll
(), Kent State University, jstoll7@kent.edu;
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Andrea Fitzgibbon
(), Kent State University , afitzgib@kent.edu;
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James Larson
(), U.S. Geological Survey, jhlarson@usgs.gov;
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