Total phosphorus-precipitation and Chlorophyll a-phosphorus relationships of lakes and reservoirs mediated by soil iron at regional scale

Tang, Quehui; Peng, Liang; Yang, Yang; Lin, Qiuqi; Qian, Song S.; Han, Bo

doi:10.1016/j.watres.2019.01.038

Cited by 31 publications

(14 citation statements)

References 42 publications

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“…Given that the non-toxic strains lost dominance or maintained its proportion around 50% under N-or P-limited conditions in the co-culture experiments, we inferred that nutrient limitation may be proposed to explain this apparent inconsistency. Our field investigation demonstrated most of these (sub)tropical reservoirs were characterized as lower nutrients, especially P, similar to a previous study (Tang et al, 2019). This may confer a competitive advantage to non-toxic R. raciborskii rather than toxic ones due to the high cost of making CYN via a multienzyme complex (Neilan et al, 2013).…”

Section: Discussionsupporting

confidence: 87%

Nutrient Regulation of Relative Dominance of Cylindrospermopsin-Producing and Non-cylindrospermopsin-Producing Raphidiopsis raciborskii

Lei

Cheng

et al. 2021

Front. Microbiol.

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Raphidiopsis raciborskii (previously Cylindrospermopsis raciborskii) can produce cylindrospermopsin (CYN) which is of great concern due to its considerable toxicity to human and animals. Its CYN-producing (toxic) and non-CYN-producing (non-toxic) strains co-exist commonly in natural water bodies, while how their relative dominance is regulated has not been addressed. In this study, we combined field investigation with laboratory experiments to assessed the relationship between toxic and non-toxic R. raciborskii abundances under different nutrient levels. The rpoC1- and cyrJ-based qPCR was applied for quantifying total and toxic R. raciborskii abundances, respectively. The field survey showed that toxic R. raciborskii was detected in 97 of 115 reservoirs where its proportion ranged from 0.3% to 39.7% within the R. raciborskii population. Both total and toxic R. raciborskii abundances increased significantly with trophic level of these reservoirs, consistent with our monoculture and co-culture experiments showing in an increase in R. raciborskii growth with increasing nitrogen (N) or phosphorus (P) concentrations. In the monoculture experiments, growth rates of non-toxic and toxic strains from Australia or China were not significantly different under the same culture conditions. On the other hand, in the co-culture experiments, the toxic strains displayed a significantly faster growth than non-toxic strains under nutrient-replete conditions, resulting in an obvious shift toward the dominance by toxic strains from day 3 to the end of the experiments, regardless of the strain originating from Australia or China. The reverse was found under N- or P-limited conditions. Our results indicated that the toxic strains of R. raciborskii have a competitive advantage relative to the non-toxic strains in a more eutrophic world. In parallel to an increase in dominance, both toxic strains grown in the mixed population significantly increased CYN production under nutrient-replete conditions as compared to nutrient-limited conditions, suggesting that CYN may be of significance for ecological advantage of toxic R. raciborskii. These results highlight the importance of nutrient availability in regulating abundances and strain dominance of two genotypes of R. raciborskii. Our findings demonstrated that elevated nutrients would favor the growth of CYN-producing R. raciborskii and CYN production, leading to more blooms with higher toxicity at global scale.

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Section: Discussionsupporting

confidence: 87%

Nutrient Regulation of Relative Dominance of Cylindrospermopsin-Producing and Non-cylindrospermopsin-Producing Raphidiopsis raciborskii

Lei

Cheng

et al. 2021

Front. Microbiol.

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“…With a time series analysis from 2000 to 2014 for the large, deep pre-alpine Lago Maggiore, Morabito et al [31] show that over longer time spans (months) pronounced rain events dilute rather than enrich nutrients; nonetheless within short time spans (5-7 days) cyanobacterial blooms showed some (albeit not significant) correlation to rainfall. Furthermore, soil characteristics in the catchment, such as iron content, have an impact on P loads following storm events, and Tang et al [32] conclude that an increase in extreme precipitation events may substantially mitigate eutrophication in some waterbodies while worsening the conditions in others.…”

Section: Impact Of Climate Change On Conditions In Waterbodiesmentioning

confidence: 99%

Cyanobacteria and Cyanotoxins in a Changing Environment: Concepts, Controversies, Challenges

Chorus

Fastner

Welker³

2021

Water

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Concern is widely being published that the occurrence of toxic cyanobacteria is increasing in consequence of climate change and eutrophication, substantially threatening human health. Here, we review evidence and pertinent publications to explore in which types of waterbodies climate change is likely to exacerbate cyanobacterial blooms; whether controlling blooms and toxin concentrations requires a balanced approach of reducing not only the concentrations of phosphorus (P) but also those of nitrogen (N); how trophic and climatic changes affect health risks caused by toxic cyanobacteria. We propose the following for further discussion: (i) Climate change is likely to promote blooms in some waterbodies—not in those with low concentrations of P or N stringently limiting biomass, and more so in shallow than in stratified waterbodies. Particularly in the latter, it can work both ways—rendering conditions for cyanobacterial proliferation more favourable or less favourable. (ii) While N emissions to the environment need to be reduced for a number of reasons, controlling blooms can definitely be successful by reducing only P, provided concentrations of P can be brought down to levels sufficiently low to stringently limit biomass. Not the N:P ratio, but the absolute concentration of the limiting nutrient determines the maximum possible biomass of phytoplankton and thus of cyanobacteria. The absolute concentrations of N or P show which of the two nutrients is currently limiting biomass. N can be the nutrient of choice to reduce if achieving sufficiently low concentrations has chances of success. (iii) Where trophic and climate change cause longer, stronger and more frequent blooms, they increase risks of exposure, and health risks depend on the amount by which concentrations exceed those of current WHO cyanotoxin guideline values for the respective exposure situation. Where trophic change reduces phytoplankton biomass in the epilimnion, thus increasing transparency, cyanobacterial species composition may shift to those that reside on benthic surfaces or in the metalimnion, changing risks of exposure. We conclude that studying how environmental changes affect the genotype composition of cyanobacterial populations is a relatively new and exciting research field, holding promises for understanding the biological function of the wide range of metabolites found in cyanobacteria, of which only a small fraction is toxic to humans. Overall, management needs case-by-case assessments focusing on the impacts of environmental change on the respective waterbody, rather than generalisations.

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“…Além disso, diversos trabalhos avaliam as influências dos nutrientes na produção de algas, com diferentes abordagens (ANDRADE et al, 2019;ATIQUE;BARROS et al, 2019;LUCENA-SILVA et al, 2019;MAMUN;AN, 2017;REEDER, 2017;TANG et al, 2019). A literatura relata que as concentrações de fósforo total (P) e nitrogênio total (N) têm grande influência na produtividade de ecossistemas aquáticos como parte do metabolismo do fitoplâncton, incluindo cianobactérias.…”

Section: Introductionunclassified

“…De maneira alternativa, outros estudos propõem correlações empíricas para predição da concen-tração de cianobactérias ou clorofila a (Cla) com base nas concentrações de P e N, entre outros parâmetros (DILLON;RIGLER, 1974;RAST;LEE, 1978;BARTSCH;GAKSTATTER, 1978;FILSTRUP et al, 2014;DOWNING, 2017). Tang et al (2019) avaliaram as concentrações de P e Cla em 189 corpos hídricos localizados na China, a fim de estudar a influência das precipitações nas concentrações, tendo em vista o impacto desses nutrientes na qualidade da água. Já Xu, Yang e Xiong (2020) concluíram, por meio da análise de cenários utilizando modelos aditivos generalizados em um lago raso nos Estados Unidos, que a carga de P a longo prazo tem uma influência mais significante na biomassa das algas do que cargas externas de curto prazo.…”

Section: Introductionunclassified

Análise E Modelagem Das Relações Entre Nutrientes E Fitoplâncton Em Reservatórios Do Ceará

Rocha

Mesquita

Neto

2020

Rev. Bras. Ciênc. Ambient. (Online)

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Este trabalho objetivou analisar a relação entre os nutrientes fósforo total (P) enitrogênio total (N) e a clorofila a (Cla) em um pequeno açude urbano e em açudesrurais. Realizou-se a análise dos parâmetros de qualidade da água em um açudelocalizado em Fortaleza (CE), por meio de estudo de campo, além do levantamentodo histórico de monitoramento dos mesmos parâmetros em 35 açudes rurais,no semiárido do Nordeste brasileiro, no estado do Ceará. Geraram-se correlaçõesempíricas entre os nutrientes e o fitoplâncton. Posteriormente, analisaram-secenários de redução das cargas de nutrientes com a aplicação de um modelode qualidade da água de mistura completa, cujo coeficiente de decaimento doP é para regiões semiáridas, e das equações empíricas obtidas. Verificou-se queP melhor descreveu a concentração de Cla em todos os açudes, com o ajustede equações do tipo potência. As concentrações de P no açude urbano foramsuperiores às dos demais açudes, com uma média de 1,76 mg/L e a relação N:Pem torno de 1; nos açudes rurais, as concentrações médias variaram entre 0,04e 0,59 mg/L e a relação N:P variou entre 5 e 50. A análise dos cenários mostrouque diferentes níveis de redução da carga de P poderiam ser adotados em funçãode distintas metas de redução das concentrações de P e Cla. Concluiu-se que osmodelos propostos são aplicáveis e constituem ferramentas úteis de auxílio àtomada de decisão na gestão dos recursos hídricos.

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Total phosphorus-precipitation and Chlorophyll a-phosphorus relationships of lakes and reservoirs mediated by soil iron at regional scale

Cited by 31 publications

References 42 publications

Nutrient Regulation of Relative Dominance of Cylindrospermopsin-Producing and Non-cylindrospermopsin-Producing Raphidiopsis raciborskii

Nutrient Regulation of Relative Dominance of Cylindrospermopsin-Producing and Non-cylindrospermopsin-Producing Raphidiopsis raciborskii

Cyanobacteria and Cyanotoxins in a Changing Environment: Concepts, Controversies, Challenges

Análise E Modelagem Das Relações Entre Nutrientes E Fitoplâncton Em Reservatórios Do Ceará

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