Salt tolerance of the harmful cyanobacterium Microcystis aeruginosa

Tonk, Linda; Bosch, Kim; Visser, P.; Huisman, Jef

doi:10.3354/ame046117

Cited by 172 publications

(121 citation statements)

References 31 publications

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“…Microcystis is a widespread genus that can produce the toxin microcystin (MC) and develops dense blooms in many eutrophic lakes and brackish waters across the globe (Chen et al, 2003;Orr et al, 2004;Verspagen et al, 2006;Tonk et al, 2007;Paerl and Huisman, 2008;Michalak et al, 2013). Our analysis reveals genetic diversity in the presence/ absence of the bicarbonate uptake genes bicA and sbtA among Microcystis strains.…”

Section: Introductionmentioning

confidence: 80%

Genetic diversity of inorganic carbon uptake systems causes variation in CO2 response of the cyanobacterium Microcystis

et al. 2013

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Rising CO 2 levels may act as an important selective factor on the CO 2 -concentrating mechanism (CCM) of cyanobacteria. We investigated genetic diversity in the CCM of Microcystis aeruginosa, a species producing harmful cyanobacterial blooms in many lakes worldwide. All 20 investigated Microcystis strains contained complete genes for two CO 2 uptake systems, the ATP-dependent bicarbonate uptake system BCT1 and several carbonic anhydrases (CAs). However, 12 strains lacked either the high-flux bicarbonate transporter BicA or the high-affinity bicarbonate transporter SbtA. Both genes, bicA and sbtA, were located on the same operon, and the expression of this operon is most likely regulated by an additional LysR-type transcriptional regulator (CcmR2). Strains with only a small bicA fragment clustered together in the phylogenetic tree of sbtAB, and the bicA fragments were similar in strains isolated from different continents. This indicates that a common ancestor may first have lost most of its bicA gene and subsequently spread over the world. Growth experiments showed that strains with sbtA performed better at low inorganic carbon (C i ) conditions, whereas strains with bicA performed better at high C i conditions. This offers an alternative explanation of previous competition experiments, as our results reveal that the competition at low CO 2 levels was won by a specialist with only sbtA, whereas a generalist with both bicA and sbtA won at high CO 2 levels. Hence, genetic and phenotypic variation in C i uptake systems provide Microcystis with the potential for microevolutionary adaptation to changing CO 2 conditions, with a selective advantage for bicA-containing strains in a high-CO 2 world.

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Section: Introductionmentioning

confidence: 80%

Genetic diversity of inorganic carbon uptake systems causes variation in CO2 response of the cyanobacterium Microcystis

et al. 2013

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“…Since increasing salinities can induce cell lyses and/ or extracellular release of toxins [103], an indirect effect of heavy rainfall/floods, by conveying toxic cyanobacteria to brackish coastal waters, can be an increase in the extracellular quota of toxins. In 2005 in St. Lucie River Estuary, one of the largest brackish water systems on the East Coast of Florida, a periods of heavy rainfall caused the washout of M. aeruginosa cells into the estuary, suddenly covered by a dense bloom: the abrupt change in salinity (32‰) caused an increase of 80% of toxin release in water [104].…”

Section: Heavy Rainfall and Floodsmentioning

confidence: 99%

“…Changes in phytoplankton communities of coastal environment exposed to a reduction in freshwater discharge and to saltwater intrusion, can eliminate more sensitive species and favor more tolerant cyanobacteria and expose aquatic organisms to higher concentration of dissolved cyanotoxins [103].…”

Section: Droughtsmentioning

confidence: 99%

Impact of climate change on waterborne diseases

Funari

Manganelli

Sinisi

2012

Annali Dell'Istituto Superiore Di Sanità

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Abstract. Change in climate and water cycle will challenge water availability but it will also increase the exposure to unsafe water. Floods, droughts, heavy storms, changes in rain pattern, increase of temperature and sea level, they all show an increasing trend worldwide and will affect biological, physical and chemical components of water through different paths thus enhancing the risk of waterborne diseases. This paper is intended, through reviewing the available literature, to highlight environmental changes and critical situations caused by floods, drought and warmer temperature that will lead to an increase of exposure to water related pathogens, chemical hazards and cyanotoxins. The final aim is provide knowledge-based elements for more focused adaptation measures.Key words: climate change, waterborne diseases, microbial pathogens, chemical contaminants, toxic cyanobacteria.Riassunto (Effetto dei cambiamenti climatici sulle malattie trasmesse dall'acqua). I cambiamenti climatici e del ciclo idrologico metteranno a rischio la disponibilità d'acqua e aumenteranno l'esposizione ad acqua contaminata. Le alluvioni, le siccità, le grandi tempeste, le variazioni nella frequenza ed intensità delle piogge, il riscaldamento e l'aumento del livello del mare crescono in ogni parte del mondo e influenzeranno le caratteristiche biologiche e chimico-fisiche dell'acqua attraverso diversi meccanismi, con il conseguente aumento del rischio di malattie trasmesse dall'acqua. L'analisi della letteratura disponibile, presentata in questo articolo, evidenzia i cambiamenti ambientali e le situazioni critiche causate da alluvioni, siccità e crescente riscaldamento che causeranno un aumento di esposizione a patogeni, inquinanti chimici e cianotossine, legati all'acqua. Lo scopo è di fornire gli elementi scientifici di base per misure di adattamento mirate.Parole chiave: cambiamenti climatici, malattie trasmesse dall'acqua, microrganismi patogeni, contaminanti chimici, cianobatteri tossici.

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“…Aphanizomenon reduces its growth rate to 30 % at 7 g l -1 (Teubner et al 1999). Microcystis might bloom up to 12.5-14 g l -1 (Verspagen et al 2006a;Tonk et al 2007) or 25 g l -1 (Robson and Hamilton 2003). Anabaena reduces its growth rate to 30 % at 9 or 15 g l -1 (Singh and Kshatriya 2002).…”

Section: Chemicalmentioning

confidence: 99%

How to combat cyanobacterial blooms: strategy toward preventive lake restoration and reactive control measures

Stroom

Kardinaal

2016

Aquat Ecol

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Water managers worldwide are facing the serious problem of dense blooms of cyanobacteria in surface waters. In the quest for the optimal method to combat cyanobacterial dominance, many questions and many possible solutions arise. This paper presents a three-phase strategy to fight harmful cyanobacterial proliferation. Water managers who apply this strategy can generate a tailor-made set of measures. The three phases consist of (1) defining the ecological water quality targets of the waterbody in question, (2) assessing its current ecological state, and (3) selecting which measures will yield optimal results. The paper provides assistance in the quantitative diagnosis of the state of both shallow and deep temperate freshwater lakes by means of a lake system analysis, and presents a survey of measures. Measures are divided into two sets. Preventive measures are based on switching to a clear state (shallow lake) or reducing the overall cyanobacterial biomass (deep lake). They are subdivided into nutrient reduction, hydromorphological adjustments, and food web management. Concerning nutrient reduction, in many situations phosphorus management alone should suffice. Nitrogen management can be important to increase the species diversity of macrophytes, or to relieve downstream (marine) consequences. Control measures (including mitigation) have a direct impact on cyanobacterial blooms by biomass removal, flushing, or mixing; however, the number of proven technologies is limited.

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Salt tolerance of the harmful cyanobacterium Microcystis aeruginosa

Cited by 172 publications

References 31 publications

Genetic diversity of inorganic carbon uptake systems causes variation in CO2 response of the cyanobacterium Microcystis

Genetic diversity of inorganic carbon uptake systems causes variation in CO2 response of the cyanobacterium Microcystis

Impact of climate change on waterborne diseases

How to combat cyanobacterial blooms: strategy toward preventive lake restoration and reactive control measures

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