Genetic and eco-physiological differences of South American Cylindrospermopsis raciborskii isolates support the hypothesis of multiple ecotypes

Piccini, Claudia; Aubriot, Luis; Fabre, Amelia; Amaral, Valentina; González-Piana, Mauricio; Giani, Alessandra; Figueredo, Cleber Cunha; Vidal, Letícia; Kruk, Carla; Bonilla, Sylvia

doi:10.1016/j.hal.2011.04.016

Cited by 113 publications

(124 citation statements)

References 59 publications

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“…The species can exploit high light conditions, as found in field (Fabbro and Duivenvoorden, 1996;Dokulil and Mayer, 1996) and experimental studies (Wu et al, 2009;Mehnert et al, 2010). Our analysis showed maximum C. raciborskii dominance of the phytoplankton in both low (z eu /z mix <0.2) and high (z eu /z mix >1) transparency conditions, reinforcing the species' capacity for success in different light environments due to its phenotypic plasticity (Piccini et al, 2011;Mehnert et al, 2012). Furthermore, our experimental data clearly show that light intensity is a critical factor in C. raciborskii performance, as growth rates indicated a clear optimization of species fitness at high temperatures and light intensities (Fig.…”

Section: Discussionsupporting

confidence: 75%

“…Two Uruguayan isolates from eutrophic lakes were used: P. agardhii (MVCC11) (from Lago Rodó) and C. raciborskii (MVCC14) (from Laguna Blanca) and maintained in BG-11 full medium as described in Piccini et al (2011).…”

Section: Growth Experiments Under a Combination Of Temperature And LImentioning

confidence: 99%

“…Since the original classification of C. raciborskii as a shade-tolerant species (Padisák and Reynolds, 1998) with low saturation light intensities for growth (I k <26 µmol photon m -2 s -1 ) (Briand et al, 2004), new evidence has shown that this species has a high phenotypic plasticity that may explain its good performance at high light intensities (Saker and Eaglesham, 1999;Piccini et al, 2011;Bonilla et al, 2012;Pierangelini et al, 2014). Thus, light intensity itself may be not sufficient to explain the expansion of C. raciborskii, since it was reported to tolerate both low and high light intensities in temperate (Dokulil and Teubner, 2000;Wiedner et al, 2007) and tropical regions (Soares et al, 2009;Gomes et al, 2013).…”

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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: 75%

Section: Growth Experiments Under a Combination Of Temperature And LImentioning

confidence: 99%

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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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“…However, achievements have been done to understand the factors that promote the success of this algae worldwide (Piccini et al 2011;Bonilla et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Among them, wide ranges of environmental preferences and tolerance to variable light intensity have been referred to as factors that promote the expansion of C. raciborskii (Briand et al 2004;Piccini et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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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Taxonomic Identification of Cyanobacteria by a Polyphasic Approach

Wilmotte

Laughinghouse

Capelli

et al. 2017

Molecular Tools for the Detection and Quantification of Toxigenic Cyanobacteria

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Genetic and eco-physiological differences of South American Cylindrospermopsis raciborskii isolates support the hypothesis of multiple ecotypes

Cited by 113 publications

References 59 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

Taxonomic Identification of Cyanobacteria by a Polyphasic Approach

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