A tale of two blooms: do ecological paradigms for algal bloom success and succession require revisiting?

Zepernick, Brittany N.; McKay, R. Michael L.; Martin, Robbie M.; Bullerjahn, George S.; Paerl, Hans W.; Wilhelm, Steven W.

doi:10.1016/j.jglr.2024.102336

Journal of Great Lakes Research

2024

DOI: 10.1016/j.jglr.2024.102336

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A tale of two blooms: do ecological paradigms for algal bloom success and succession require revisiting?

Brittany N. Zepernick,

R. Michael L. McKay,

Robbie M. Martin

et al.

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Cited by 5 publications

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Dual phosphorus and nitrogen nutrient reduction will be more effective than a phosphorus‐only reduction in mitigating diatom and cyanobacterial blooms in Lake Erie, USA–Canada

Paerl,

Chaffin,

Cheshire

et al. 2024

Limnology & Oceanography

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Lake Erie, USA–Canada, plays an important ecological and socioeconomic role but has suffered from chronic eutrophication. In particular, western Lake Erie (WLE) is the site of harmful algal blooms (HABs) which are suspected of being driven by excessive nutrient (phosphorus (P) and nitrogen (N)) inputs. During 2022 and 2023, in situ nutrient dilution and addition bioassays were conducted at a WLE bloom‐impacted location to investigate whether a nutrient reduction regime would be effective in limiting phytoplankton growth during the June diatom‐dominated spring blooms and August cyanobacteria‐dominated summer blooms. The primary objectives of this experiment were to (1) Determine if a proposed 40% P‐alone reduction would effectively reduce phytoplankton growth and mitigate blooms and (2) assess whether reductions in both P and N are more effective in controlling phytoplankton biomass than exclusive reductions in either N or P. Samples were analyzed for nutrient concentrations and growth rate responses for specific algal groups, utilizing diagnostic (for major algal groups) photopigments. Results indicated that although both 20% and 40% dilutions led to lower phytoplankton biomass and growth rates, 40% reductions were more effective. Our results support the USA–Canada Great Lakes Water Quality Agreement recommendation of a 40% P reduction, but also indicate that a parallel reduction of N input by 40% would be most effective in controlling bloom magnitudes. Overall, our findings underscore the recommendation that a year‐round dual N and P 40% reduction is needed for long‐term control of eutrophication and algal blooms, including cyanobacteria and diatoms, in Lake Erie.

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Dual phosphorus and nitrogen nutrient reduction will be more effective than a phosphorus‐only reduction in mitigating diatom and cyanobacterial blooms in Lake Erie, USA–Canada

Paerl,

Chaffin,

Cheshire

et al. 2024

Limnology & Oceanography

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Cyanobacterial Blooms in Environmental Water: Causes and Solutions

Lakshmikandan,

Li,

Pan

2024

Curr Pollution Rep

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Molecular investigation of harmful cyanobacteria reveals hidden risks and niche partitioning in Kenyan Lakes

Zepernick,

Hart,

Chase

et al. 2024

Harmful Algae

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A tale of two blooms: do ecological paradigms for algal bloom success and succession require revisiting?

Cited by 5 publications

References 220 publications

Dual phosphorus and nitrogen nutrient reduction will be more effective than a phosphorus‐only reduction in mitigating diatom and cyanobacterial blooms in Lake Erie, USA–Canada

Dual phosphorus and nitrogen nutrient reduction will be more effective than a phosphorus‐only reduction in mitigating diatom and cyanobacterial blooms in Lake Erie, USA–Canada

Cyanobacterial Blooms in Environmental Water: Causes and Solutions

Molecular investigation of harmful cyanobacteria reveals hidden risks and niche partitioning in Kenyan Lakes

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