Global changes may be promoting a rise in select cyanobacteria in nutrient‐poor northern lakes

Freeman, Erika C.; Creed, Irena F.; Jones, Blake; Bergström, Ann‐Kristin

doi:10.1111/gcb.15189

Cited by 50 publications

(43 citation statements)

References 117 publications

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“…The relatively low total phytoplankton biovolume in ERA5 is explained by the small sized cells, making the high biovolume of cyanobacteria even more striking. Several small celled cyanobacterial groups, including the species of Chroococcales such as Chroococcus found in ERA5, are considered indicators of increasing P and high N concentrations (Andersson et al 2015;Freeman et al 2020) in addition to the green alga, Pediastrum, which was only found in ERA5, with a prevalence of 11.2% of phytoplankton biovolume (Table S1). Pediastrum has been associated with increased primary production driven by recent climate change in subarctic and high Arctic lakes (Rühland et al 2013;Woelders et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Evidence of eutrophication in Arctic lakes

et al. 2021

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Lakes and ponds are dominant components of Arctic landscapes and provide food and water for northern communities. In the Greiner Lake watershed, in Cambridge Bay (Nunavut, Canada), water bodies are small (84% < 5 ha) and shallow (99% <4 m). Such characteristics make them vulnerable to eutrophication as temperatures rise and nutrient concentrations from the greening landscape increase. Here, we investigated and compared 35 lakes and ponds in the Greiner watershed in August 2018 and 2019 to determine their current trophic states based on their chemical composition and phytoplankton communities. The ponds had higher trophic status than the lakes, but overall, most sites were oligotrophic. Lake ERA5, located upstream of any direct human influence was classified as eutrophic due to high total phosphorus (32.3 µg L<sup>-1</sup>) and a high proportion of Cyanobacteria (42.9% of total phytoplankton biovolume). Satellite imagery suggests the lake may have been eutrophic for the last 30 years. We hypothesize that the coupled effects of catchment characteristics and elevated local snow accumulation patterns promote higher nutrient leaching rates from the soils. We recommend further analysis and monitoring as eutrophication could become more widespread with ongoing climate change and the associated increases in temperature, precipitation, and catchment-lake coupling.

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Section: Discussionmentioning

confidence: 99%

Evidence of eutrophication in Arctic lakes

et al. 2021

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“…The warming of surface waters directly benefits cyanobacteria because their growth rates can peak between 25 and 35°C (Huisman et al, 2018; Paerl & Huisman, 2009; Richardson et al, 2019), and evidence from marine systems indicates that cyanobacteria may adapt to warming temperatures at faster rates than do other groups of phytoplankton (Barton et al, 2020). Growth rates of other phytoplankton decline once they exceed optimal temperatures of 15–25°C (Huisman et al, 2018; Paerl & Huisman, 2008, 2009), though changes in growth rate responses can be quite variable among species and strains within all groups of phytoplankton (Huisman et al, 2018; Lürling et al, 2013; Rigosi et al, 2014) and other factors can be important and affect taxa differently (Freeman et al, 2020). In non‐stratifying reservoirs, surface temperatures on average are 25.5°C in June, after increasing by 2.4°C since 1989.…”

Section: Discussionmentioning

confidence: 99%

“…Experiments indicate that cyanobacteria have optimal growth rates at warmer temperatures than those of other groups of phytoplankton, such as diatoms and cryptomonads (Carey et al, 2012; Huisman et al, 2018; Paerl & Huisman, 2009), and their growth rates respond to warming waters more quickly than those of green algae (Visser et al, 2016), despite evidence of having similar optimal temperatures for growth (Lürling et al, 2013; Paerl et al, 2016). As a result, differences in the temperature dependence of phytoplankton growth rates can contribute to greater cyanobacteria abundances in warmer waters, even when nutrient concentrations are low (Freeman et al, 2020; Kosten et al, 2012; O'Neil et al, 2012). Warming trends, in combination with changes in water clarity, also increase the strength and duration of thermal stratification in lentic ecosystems (Kraemer et al, 2015; Richardson et al, 2017; Rose et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Increasingly severe cyanobacterial blooms and deep water hypoxia coincide with warming water temperatures in reservoirs

Smucker

Beaulieu

Nietch

et al. 2021

Global Change Biology

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Cyanobacterial blooms are expected to intensify and become more widespread with climate change and sustained nutrient pollution, subsequently increasing threats to lentic ecosystems, water quality, and human health. However, little is known about their rates of change because long‐term monitoring data are rare, except for some well‐studied individual lakes, which typically are large and broadly dispersed geographically. Using monitoring data spanning 1987–2018 for 20 temperate reservoirs located in the USA, we found that cyanobacteria cell densities mostly posed low‐to‐moderate human health risks until 2003–2005, after which cell densities rapidly increased. Increases were greatest in reservoirs with extensive agriculture in their watersheds, but even those with mostly forested watersheds experienced increases. Since 2009, cell densities posing high human health risks have become frequent with 75% of yearly observations exceeding 100,000 cells ml−1, including 53% of observations from reservoirs with mostly forested watersheds. These increases coincided with progressively earlier and longer summer warming of surface waters, evidence of earlier onset of stratification, lengthening durations of deep‐water hypoxia, and warming deep waters in non‐stratifying reservoirs. Among years, higher cell densities in stratifying reservoirs were associated with greater summer precipitation, warmer June surface water temperatures, and higher total Kjeldahl nitrogen concentrations. These trends are evidence that expected increases in cyanobacterial blooms already are occurring as changing climate conditions in some regions increasingly favor their proliferation. Consequently, their negative effects on ecosystems, human health, and socioeconomic wellbeing could increase and expand if warming trends and nutrient pollution continue.

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“…As the overall function of aquatic ecosystems alteration in Summer, such as biochemical transformations of nutrients (Wu et al 2017;Ding et al 2018;Jenny et al 2020), there might create an environment which is particularly beneficial for phytoplankton surviving (e.g. cyanobacteria) and result in HABs (Paerl et al 2016;Freeman et al 2020). From the results, although stopping operation and high temperature could affect the removal rates of the bioreactor, there had little influence on the purification effect when the bioreactor was running, showing the good effect of the bioreactor.…”

Section: Season-changing and Stopping Operation Affect The Removal Rate Of The Bioreactormentioning

confidence: 94%

“…In recent decades, aquatic ecosystem has suffered much more serious problems of water eutrophication due to anthropogenic pollution and climate change (Le et al 2010;Smith 2003;Kosten et al 2012;Andersen et al 2020a;Freeman et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Purification effect evaluation of the designed new volcanic soil adsorption material containing bioreactor for eutrophic water treatment

Ding

Zhai³

et al. 2021

Environ Sci Pollut Res

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To investigate the purification effect of the new adsorption material containing bioreactor and the critical role of non-culture (VBNC) bacteria in eutrophication ecosystem, major water quality parameters and microbial community were determined and analyzed in prepared eutrophic water for 2 years monitoring. The results showed that removal rates of total phosphorus (TP), total nitrogen (TN), chlorophyll-a (Chl-a) and chemical oxygen demand (COD) ranged of 90.7% -95.9%, 84.5% -92.4%, 87.9% -95.8% and 68.3% -82.7%, respectively, indicating the designed bioreactor possessed high efficiency in eutrophic water treatment. Although the bioreactor had been operated for 2 years, water from treatment group was more clearer and odorless than control group, exhibiting the long service life of the bioreactor. Stopping operation in August caused the removal rates of major water quality parameters significantly decrease (p < 0.05), revealing stopping operation and high temperature in Summer exerted dual effect on the bioreactor, whereas the impact could be minimized when the bioreactor was running. According to most probable number (MPN) method, the total bacteria under +Rpf treatment were higher than under -Rpf treatment, implying Rpf could resuscitate VBNC bacteria in eutrophication ecosystem. Nine VBNC bacteria were isolated based on the BLAST results of 16S rRNA gene, and these bacteria might contribute to eutrophic water treatment based on their functions, such as phosphorus-collecting and denitrification. Those results provided new insights for engineering technology innovation and had benefit in eutrophic water treatment.

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Global changes may be promoting a rise in select cyanobacteria in nutrient‐poor northern lakes

Abstract: Northern ecosystems are anticipated to undergo the greatest rates of climate change (Hansen et al., 2006; IPCC, 2007). Climate changes in northern (>45° North) ecosystems include increasing temperatures (

Cited by 50 publications

References 117 publications

Evidence of eutrophication in Arctic lakes

Evidence of eutrophication in Arctic lakes

Increasingly severe cyanobacterial blooms and deep water hypoxia coincide with warming water temperatures in reservoirs

Purification effect evaluation of the designed new volcanic soil adsorption material containing bioreactor for eutrophic water treatment

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