Extreme differences in akinete, heterocyte and cylindrospermopsin concentrations with depth in a successive bloom involving Aphanizomenon ovalisporum (Forti) and Cylindrospermopsis raciborskii (Woloszynska) Seenaya and Subba Raju

Everson, Sally.; Fabbro, Larelle; Kinnear, Susan; Wright, P. J.

doi:10.1016/j.hal.2010.10.006

Cited by 52 publications

(34 citation statements)

References 42 publications

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“…Results of the three ways ANOVA for differences in growth rate of each species (C. raciborskii and P. agardhii) under different treatments (light and temperature) and culture conditions (mono-and mixed cultures). and relative biovolume of C. raciborskii in our subtropical lake (Javier Lake) was similar to those from other subtropical lakes in Brazil (Tonetta et al, 2013), China (Lei et al, 2014) and Australia (Everson et al, 2011). The three temperate lakes in the dataset (Bnińskie and Bytyńskie, Poland; Alte Donau, Austria) were all shallow, polymictic, and eutrophic to hypereutrophic (Kokociński et al, 2010), but they differed markedly in their C. raciborksii biovolumes.…”

Section: Discussionsupporting

confidence: 70%

“…However, different temperature values (13°C and 20°C) for akinete germination have been reported in the literature (Padisák, 1997;Rücker et al, 2009), while other studies showed high C. raciborskii biomass in freshwaters at lower temperatures (11 to 19°C) (Everson et al, 2011;Bonilla et al, 2012) and experimental evidence has shown that C. raciborskii growth rates have high variability at differing temperatures (15 to 40°C) (Briand et al, 2004;Soares et al, 2013). Overall, the available evidence indicates that C. raciborskii can succeed across a wide range of water temperatures and does not support the hypothesis that temperature is a limiting factor for its success.…”

mentioning

confidence: 96%

“…Studies of C. raciborskii ecology indicate that the species can dominate the phytoplankton community in a wide range of aquatic environments, deep to shallow, and mesotrophic to eutrophic lakes (Everson et al, 2011;Sinha et al, 2012;Sukenik et al, 2012;Soares et al, 2013). In these environments other cyanobacteria may also commonly alternate in dominance with C. raciborskii, including the colonial Microcystis aeruginosa (Marinho and Huszar, 2002;Soares et al, 2009) and the filamentous Planktothrix agardhii and Aphanizomenon sp.…”

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confidence: 99%

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The success of the cyanobacterium Cylindrospermopsis raciborskii in freshwaters is enhanced by the combined effects of light intensity and temperature

et al. 2016

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Toxic cyanobacterial blooms in freshwaters are thought to be a consequence of the combined effects of anthropogenic eutrophication and climate change. It is expected that climate change will affect water mixing regimes that alter the water transparency and ultimately the light environment for phytoplankton. Blooms of the potentially toxic cyanobacterium Cylindrospermopsis raciborskii are expanding from tropical towards temperate regions. Several hypotheses have been proposed to explain this expansion, including an increase in water temperature due to climate change and the high phenotypic plasticity of the species that allows it to exploit different light environments. We performed an analysis based on eight lakes in tropical, subtropical and temperate regions to examine the distribution and abundance of C. raciborskii in relation to water temperature and transparency. We then conducted a series of short-term factorial experiments that combined three temperatures and two light intensity levels using C. raciborskii cultures alone and in interaction with another cyanobacterium to identify its growth capacity. Our results from the field, in contrast to predictions, showed no differences in dominance (>40% to the total biovolume) of C. raciborskii between climate regions. C. raciborskii was able to dominate the phytoplankton in a wide range of light environments (euphotic zone = 1.5 to 5 m, euphotic zone/mixing zone ratio <0.5 to >1.5). Moreover, C. raciborskii was capable of dominating the phytoplankton at low temperatures (<15°C). Our experimental results showed that C. raciborskii growing in interaction was enhanced by the increase of the temperature and light intensity. C. raciborskii growth in high light intensities and at a wide range of temperatures, suggests that any advantage that this species may derive from climate change that favors its dominance in the phytoplankton is likely due to changes in the light environment rather than changes in temperature. Predictive models that consider only temperature as a drive factor can therefore fail in predicting the expansion of this potentially toxic cyanobacterium.

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Section: Discussionsupporting

confidence: 70%

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confidence: 96%

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confidence: 99%

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The success of the cyanobacterium Cylindrospermopsis raciborskii in freshwaters is enhanced by the combined effects of light intensity and temperature

et al. 2016

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“…As reported by Dokulil (2015), the C. raciborskii population of Lake Alte Donau survived adverse periods, being able to inoculate the phytoplankton assemblage in the following spring. The same was reported by other authors in other regions of the globe (Everson et al 2011;Wood et al 2014), including the temperate zone, which most authors suggest that the species survive in winter in the form of akinetes (Mehnert et al 2010). The light saturation parameter (I k ) is a reliable indicator to evaluate light requirements of a certain species and to allow for comparisons between species (Briand et al 2004).…”

Section: Growth Responsessupporting

confidence: 72%

Morpho-physiological responses of a subtropical strain of Cylindrospermopsis raciborskii (Cyanobacteria) to different light intensities

2016

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Th e toxigenic cyanobacterium Cylindrospermopsis raciborskii previously restricted to tropical latitudes, has been increasingly reported in temperate lakes in recent decades. Th e causes of its biogeographical expansion are under investigation, but effi cient physiological adaptation to changes in temperature and light regimes are likely to be involved. Th e present study evaluated the morpho-physiological responses of a strain of C. raciborskii from southern Brazil to nine light intensities, from 9 to 250 μmol photons m -2 s -1 . Blooms of this cyanobacterium are regularly recorded in the region. Morpho-physiological responses were measured based on growth rate and trichome length. Cylindrospermopsis raciborskii showed slow growth at low light intensities, 9 and 20 μmol photons m -2 s -1, and responded morphologically by increasing the length of trichomes. In turn, the strain displayed constant maximum growth rates at light intensities higher than 50 μmol photons m -2 s -1. Th ese results support the hypothesis that C. raciborskii can survive under low light conditions and continue to produce viable trichomes. Moreover, the strain achieved high growth rates under a relatively wide range of light intensities, a physiological adaptation that can potentially be a competitive advantage in the phytoplankton community.

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“…In Brazil, Cylindrospermopsis raciborskii produces saxitoxin [37] [59] [60], but it is reported as a cylindrospermopsin-producer in other regions of the world [61]- [67]. Based on this fact and the observation of OTUs related to this species in samples from ESALQ1, it is very likely that the saxitoxin genes detected in the lagoon were provided by members of C. raciborskii.…”

Section: Discussionmentioning

confidence: 99%

Molecular and Chemical Analyses of Cyanobacterial Blooms in Tropical Lagoons from Southeast Brazil

Elias¹,

Silva-Stenico²,

Alvarenga³

et al. 2015

JWARP

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The genetic diversity and the potential toxicity of bloom-forming cyanobacteria were studied in four lagoons located in the state of São Paulo (Campinas, Limeira and Piracicaba cities). Bloom samples were collected on the water surface and cyanobacterial communities were evaluated using DGGE fingerprinting and 16S rDNA clone library. The amplification of genes encoding secondary metabolites such as microcystin (mcy), anatoxin (ana), cylindrospermopsin (cyr), saxitoxin (sxt), cyanopeptolin (mcn) and aeruginosin (aer) was performed and their production analyzed by LC-MS. The comparison of DGGE banding pattern among the different water samples suggested that some operational taxonomic units (OTUs) in these locations were predominant over others. The 16S rDNA clone libraries sequences matched with nine different known cyanobacterial genera available in NCBI, identified as Anabaena, Brasilonema, Cylindrospermopsis, Limnococcus, Microcystis, Nostoc, Pseudanabaena, Synechococcus and Woronichinia. The lagoons ESALQ2, Taquaral and Limeira had more than 80% of the cyanobacterial community assigned to the genus Microcystis. Genes encoding aeruginosin, cyanopeptolin and microcystin synthetases and saxitoxin synthase were amplified, and LC-MS/MS confirmed the production of aeruginosin, cyanopeptolin and microcystin. Rapid and sensitive methods for the detection of these secondary metabolites, especially toxins, using chemical and molecular tools together, can be used for a faster diagnostic of toxic cyanobacterial blooms.

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Extreme differences in akinete, heterocyte and cylindrospermopsin concentrations with depth in a successive bloom involving Aphanizomenon ovalisporum (Forti) and Cylindrospermopsis raciborskii (Woloszynska) Seenaya and Subba Raju

Cited by 52 publications

References 42 publications

The success of the cyanobacterium Cylindrospermopsis raciborskii in freshwaters is enhanced by the combined effects of light intensity and temperature

The success of the cyanobacterium Cylindrospermopsis raciborskii in freshwaters is enhanced by the combined effects of light intensity and temperature

Morpho-physiological responses of a subtropical strain of Cylindrospermopsis raciborskii (Cyanobacteria) to different light intensities

Molecular and Chemical Analyses of Cyanobacterial Blooms in Tropical Lagoons from Southeast Brazil

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