2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | Seasonal nutrient limitations of cyanobacteria, phytoplankton, and cyanotoxins in a hypereutrophic, shallow lake | Virtual Platform
Seasonal nutrient limitations of cyanobacteria, phytoplankton, and cyanotoxins in a hypereutrophic, shallow lake
Excess nutrients from anthropogenic sources may escalate harmful algal and cyanobacteria blooms (HABs) even as lakes continue to become more eutrophic. To evaluate the extent that specific nutrient additions influence cyanobacterial species, phytoplankton and cyanotoxin production in hypereutrophic waters, we imposed three nutrient additions (i.e., N, P and N+P) and a control in in-situ bioassays over multiple seasons in a large shallow hypereutrophic lake (Utah Lake, UT, in the USA). We found that hypereutrophic waters elevated the cyanobacterial pigment, phycocyanin to bloom status regardless of the nutrient treatment and location across the lake, in summer, late summer, and fall. P-additions intensified phycocyanin concentrations more than any other treatment even under hypereutrophic conditions. For phytoplankton, hypereutrophic conditions initiated or boosted HABs across all seasons, locations, and treatments, and production was co-limited by N and P. Microcystin, cylindrospermopsin, and anatoxin-a concentrations demonstrated seasonal signals that were not necessarily related to the severity of the cyanobacterial blooms but were primarily associated with the alleviation of N-limitations. Our results demonstrate that the addition of specific nutrients intensify components of HABs and stimulate cyanotoxin production even under hypereutrophic conditions.
- Anthropogenic
- Biogeochemistry
- Microbial ecology
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Presenters/Authors
Gabriella Lawson
(), Brigham Young University, gmloosle@gmail.com;
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