Cyanobacterial community succession and associated cyanotoxin production in hypereutrophic and eutrophic freshwaters

Tanvir, Rahamat Ullah; Hu, Zhiqiang; Zhang, Yanyan; Lu, Jingrang

doi:10.1016/j.envpol.2021.118056

Cited by 57 publications

(38 citation statements)

References 98 publications

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“…Samples from a majority of the rivers qualified as eutrophic or above by our estimates (Table S4 and see Ref. 55 ), yet these rivers did not present dramatically different cyanobacterial community composition or richness compared to other sampled locations. All together, these findings contrast with existing literature from lentic ecosystems where environmental factors are closely intertwined with cyanobacterial communities [56][57][58] .…”

Section: Discussionmentioning

confidence: 71%

Metagenomic mapping of cyanobacteria and potential cyanotoxin producing taxa in large rivers of the United States

Linz

Sienkiewicz

Struewing

et al. 2023

Sci Rep

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Cyanobacteria and cyanotoxin producing cyanobacterial blooms are a trending focus of current research. Many studies focus on bloom events in lentic environments such as lakes or ponds. Comparatively few studies have explored lotic environments and fewer still have examined the cyanobacterial communities and potential cyanotoxin producers during ambient, non-bloom conditions. Here we used a metagenomics-based approach to profile non-bloom microbial communities and cyanobacteria in 12 major U.S. rivers at multiple time points during the summer months of 2019. Our data show that U.S. rivers possess microbial communities that are taxonomically rich, yet largely consistent across geographic location and time. Within these communities, cyanobacteria often comprise significant portions and frequently include multiple species with known cyanotoxin producing strains. We further characterized these potential cyanotoxin producing taxa by deep sequencing amplicons of the microcystin E (mcyE) gene. We found that rivers containing the highest levels of potential cyanotoxin producing cyanobacteria consistently possess taxa with the genetic potential for cyanotoxin production and that, among these taxa, the predominant genus of origin for the mcyE gene is Microcystis. Combined, these data provide a unique perspective on cyanobacteria and potential cyanotoxin producing taxa that exist in large rivers across the U.S. and can be used to better understand the ambient conditions that may precede bloom events in lotic freshwater ecosystems.

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Section: Discussionmentioning

confidence: 71%

Metagenomic mapping of cyanobacteria and potential cyanotoxin producing taxa in large rivers of the United States

Linz

Sienkiewicz

Struewing

et al. 2023

Sci Rep

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“…38,39 Relative N deficiency can usually contribute to the dominance of Dolichospermum with N 2 -fixing function. [12][13][14]40 No significant differences of Microcystis abundances between ELC and WLC were recorded in June and November. However, in August, Microcystis abundances in WLC were significantly higher than in ELC.…”

Section: Resultsmentioning

confidence: 91%

“…Microcystis and Dolichospermum were the most common taxa of bloom-forming cyanobacteria in eutrophic lakes, and seasonal successions between them occurred. The factors controlling their successions can be attributed to external environmental factors (e.g., temperature; nutrients) and interaction between these two species (e.g., P using strategy; allelopathic interactions). , Relative N deficiency can usually contribute to the dominance of Dolichospermum with N 2 -fixing function. − , …”

Section: Resultsmentioning

confidence: 99%

“…Both absolute levels of nitrogen (N) and phosphorous (P) and their ratios are the main driving factors affecting phytoplankton growth and succession in freshwater lakes. , One of the central concerns regarding lake ecosystems is whether P or N determines their primary productivity, giving rise to controversy over whether N or P reduction programs should be proposed to mitigate eutrophication. P has largely ever been considered as the solely limiting nutrient. − However, increasing studies showed that phytoplankton communities in lakes are N limited or co-limited, especially in summer − and in eutrophic lakes. − The seasonal nutrient limitation shifts indicated by N/P ratios could significantly trigger cyanobacterial succession (N 2 -fixing/non-N 2 -fixing cyanobacteria) in many eutrophic lakes. − …”

Section: Introductionmentioning

confidence: 99%

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Interactions between Phosphorus Enrichment and Nitrification Accelerate Relative Nitrogen Deficiency during Cyanobacterial Blooms in a Large Shallow Eutrophic Lake

Zhou

Liu

Wang

et al. 2023

Environ. Sci. Technol.

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Regime shifts between nitrogen (N) and phosphorus (P) limitation, which trigger cyanobacterial succession, occur in shallow eutrophic lakes seasonally. However, the underlying mechanism is not yet fully illustrated. We provide a novel insight to address this from interactions between sediment P and nitrification through monthly field investigations including 204 samples and microcosm experiments in Lake Chaohu. Total N to P mass ratios (TN/TP) varied significantly across seasons especially during algal bloom in summer, with the average value being 26.1 in June and descending to 7.8 in September gradually, triggering dominant cyanobacterial succession from Microcystis to Dolichospermum. The regulation effect of sediment N/P on water column TN/TP was stronger in summer than in other seasons. Iron-bound P and alkaline phosphatase activity in sediment, rather than ammonium, contributed to the higher part of nitrification. Furthermore, our microcosm experiments confirmed that soluble active P and enzymatic hydrolysis of organic P, accumulating during algal bloom, fueled nitrifiers and nitrification in sediments. These processes promoted lake N removal and led to relative N deficiency in turn. Our results highlight that N and P cycles do not exist independently but rather interact with each other during lake eutrophication, supporting the dual N and P reduction program to mitigate eutrophication in shallow eutrophic lakes.

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“…Harmful algal blooms cause negative impacts on environments, and they negatively affect human health and activities such as aquaculture (Zohdi and Abbaspour, 2019;Tanvir et al, 2021). Cyanobacteria bloom causes problems in aquatic ecosystems, including alteration of the trophic chain structure and local functionality due to the deoxygenation of the water and disturbance in odor and color (Lu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Use of Myriophyllum aquaticum to inhibit Microcystis aeruginosa growth and remove microcystin-LR

Kitamura

Silva²,

Pagioro

et al. 2022

Rev. Bras. Ciênc. Ambient.

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Harmful algal blooms are one of the greatest challenges when preserving water sources, especially when involving cyanobacteria such as Microcystis aeruginosa. Finding remediation possibilities is needed, and one of them has been the use of macrophytes such as the species Myriophyllum, which have presented allelopathic mechanisms of phytoplankton control. Thus, this work aimed to evaluate the inhibition of M. aeruginosa cell growth in a co-exposure with Myriophyllum aquaticum and the influence on microcystin-LR concentration. The experiments were carried out using a culture of M. aeruginosa (1x106 cells mL-1) in a co-exposure with M. aquaticum for seven days. The inhibitory effects were investigated by counting the cells; the effects on photosynthetic pigments were measured and microcystin-LR was quantified in the culture medium on the last experimental day. To evaluate the possible effects of competition for nutrients and space, the concentration of total orthophosphate was quantified and treatment with plastic plants was used. The experiments with Myriophyllum aquaticum achieved the total inhibition of M. aeruginosa growth and a significant reduction of the photosynthetic pigments (> 98%). Additionally, we observed a reduction of microcystin-LR concentration (79%) in the tests with macrophytes when compared to the control. Competition for space and nutrients was not observed, demonstrating that the effects on M. aeruginosa were caused by aquatic macrophyte presence. These results may indicate that M. aquaticum causes inhibitory effects on cyanobacteria growth by allelopathic effects and removes microcystin-LR.

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Cyanobacterial community succession and associated cyanotoxin production in hypereutrophic and eutrophic freshwaters

Cited by 57 publications

References 98 publications

Metagenomic mapping of cyanobacteria and potential cyanotoxin producing taxa in large rivers of the United States

Metagenomic mapping of cyanobacteria and potential cyanotoxin producing taxa in large rivers of the United States

Interactions between Phosphorus Enrichment and Nitrification Accelerate Relative Nitrogen Deficiency during Cyanobacterial Blooms in a Large Shallow Eutrophic Lake

Use of Myriophyllum aquaticum to inhibit Microcystis aeruginosa growth and remove microcystin-LR

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