A novel method for tracking western Lake Erie Microcystis blooms, 2002–2011

Bridgeman, Thomas B.; Chaffin, Justin D.; Filbrun, Jesse E.

doi:10.1016/j.jglr.2012.11.004

Cited by 120 publications

(89 citation statements)

References 23 publications

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“…S1). In situ sampling of algal biovolume, areal coverage, and duration indicate that by early September the bloom was at least 2.4 times greater than the previous largest bloom (2008), and four times greater than the average of blooms between 2002 and 2010 (14). As Microcystis declined in the western basin in the latter part of the summer, the bloom spread into the central basin, eventually extending 150 km eastward and persisting until mid-October.…”

Section: Resultsmentioning

confidence: 91%

“…These load reductions resulted in a rapid and profound ecological response as predicted by a range of models (8)(9)(10). Despite early success from these management actions, however, hypolimnetic oxygen depletion rates, hypoxia extent (11,12), and algal biomass (13)(14)(15) have increased systematically since the mid-1990s. Of greatest concern is the increase in toxin-forming strains of the cyanobacteria Microcystis sp.…”

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confidence: 99%

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Record-setting algal bloom in Lake Erie caused by agricultural and meteorological trends consistent with expected future conditions

Michalak

Anderson

Beletsky

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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1,148

774

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In 2011, Lake Erie experienced the largest harmful algal bloom in its recorded history, with a peak intensity over three times greater than any previously observed bloom. Here we show that long-term trends in agricultural practices are consistent with increasing phosphorus loading to the western basin of the lake, and that these trends, coupled with meteorological conditions in spring 2011, produced record-breaking nutrient loads. An extended period of weak lake circulation then led to abnormally long residence times that incubated the bloom, and warm and quiescent conditions after bloom onset allowed algae to remain near the top of the water column and prevented flushing of nutrients from the system. We further find that all of these factors are consistent with expected future conditions. If a scientifically guided management plan to mitigate these impacts is not implemented, we can therefore expect this bloom to be a harbinger of future blooms in Lake Erie.extreme precipitation events | climate change | aquatic ecology | Microcystis sp. | Anabaena sp.

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Section: Resultsmentioning

confidence: 91%

mentioning

confidence: 99%

Record-setting algal bloom in Lake Erie caused by agricultural and meteorological trends consistent with expected future conditions

Michalak

Anderson

Beletsky

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

1,148

774

View full text Add to dashboard Cite

show abstract

“…Anthropogenic activities have led to increased nutrient discharges, which in turn result in higher nitrogen (N) and phosphorous (P) concentrations in lakes and reservoirs. Numerous studies have reported increases in algal bloom frequency in lakes and reservoirs because of increasing nutrient availability (Duan et al 2009;Winter et al 2011;Bridgeman et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Differences in phytoplankton dynamics and community structure between a wet year and dry year in the Zhoucun Reservoir

Qiu

Zeng

2016

Journal of Freshwater Ecology

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Rainfall-induced nutrient fluctuations in surface water affect phytoplankton communities and cause algal blooms. To examine this influence in the Zhoucun Reservoir, China, field surveys were performed weekly or biweekly from February 2013 (a wet year) to December 2014 (a dry year). Physical conditions, nutrient levels, and phytoplankton functional groups were investigated during monitoring. Nutrient levels increased in the summer of 2013 (TN: 0.85À2.66 mg/L; TP: 0.037À0.138 mg/L), while nitrogen deficiency occurred in the summer of 2014 (TN: 0.38À0.73 mg/L, TP: 0.044À0.079 mg/L). A cyanobacteria bloom that appeared in the summer of 2013 had the dominant phytoplankton functional groups M and Tc. In the summer of 2014, algal cell density and biomass were much lower than those during the corresponding period in 2013, and the co-dominant phytoplankton groups were F, L 0 , Tc, and S2. Non-N-fixing cyanobacteria were not abundant in summer 2013 probably because of the low ratio of NO 3 ¡ to NH 4 C , although nitrogen was also deficient. In contrast to these summer trends, little difference was noted between phytoplankton dynamics and community structure in the two winters and two springs, regardless of nutrient conditions. Redundancy analysis indicated that rainfall-induced nitrogen fluctuations were the primary factor causing phytoplankton dynamics to differ between the wet and dry year. The effects of water temperature, stratification, and light on the phytoplankton community were independent of nutrient fluctuations. This study shows that rainfall fluctuations change summer nutrient conditions and that cyanobacteria blooms are likely to occur in wet years in the Zhoucun Reservoir.

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“…Chlorophyll a is the most convenient parameter for determining total phytoplankton biomass in water bodies but cannot differentiate among different taxonomic groups (Bridgeman et al 2013). Biovolume is commonly used to assess the relative abundance of cooccurring algae that vary in shape and/or size (Hillebrand et al 1999).…”

Section: Introductionmentioning

confidence: 99%

A quantitative protocol for rapid analysis of cell density and size distribution of pelagic and benthic Microcystis colonies by FlowCAM

Wang

Tian

et al. 2014

J Appl Phycol

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Colony formation plays an important role in the life history of Microcystis. However, analyzing the colony size distribution with a microscope is time consuming, and colony formation also hinders the direct monitoring of cell density. In this study, a quantitative protocol for rapidly analyzing the cell density and colony size distribution of pelagic and benthic Microcystis was developed. Microcystis colonies were disintegrated by alkaline hydrolysis with 0.01-0.05 mol L −1 sodium hydroxide at 85°C for 6-8 min and automatically measured by the Flow Camera And Microscope (FlowCAM). Benthic Microcystis colonies were isolated from different lake sediments using 40 % Percoll solution. Alkaline hydrolysis was validated as a rapid and universally effective method to disintegrate different morphospecies of Microcystis colonies. The FlowCAM exhibited excellent accuracy, reproducibility, and efficiency in determining the cell density and size distribution of Microcystis. The developed protocol was successfully applied to field samples from Lake Caohai (China) and can accurately monitor the population dynamics and colony size distribution of bloom-forming Microcystis.

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A novel method for tracking western Lake Erie Microcystis blooms, 2002–2011

Cited by 120 publications

References 23 publications

Record-setting algal bloom in Lake Erie caused by agricultural and meteorological trends consistent with expected future conditions

Record-setting algal bloom in Lake Erie caused by agricultural and meteorological trends consistent with expected future conditions

Differences in phytoplankton dynamics and community structure between a wet year and dry year in the Zhoucun Reservoir

A quantitative protocol for rapid analysis of cell density and size distribution of pelagic and benthic Microcystis colonies by FlowCAM

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