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

Wojciechowski, Juliana; Fernandes, Luciano F.; Fonseca, Fernanda Vitória Buck

doi:10.1590/0102-33062015abb0322

Cited by 7 publications

(6 citation statements)

References 36 publications

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“…Cylindrospermopsis raciborskii is a widespread toxigenic species that occurs in Brazilian reservoirs, with the potential to cause a serious threat to human health. The high levels of saxitoxins from this taxon lead to interruptions in water supply (Fernandes et al 2005;Wojciechowski et al 2016). Here, we demonstrated under appropriate conditions of light and temperature that removing the macrophytes can cause intensive growth of harmful algae, which could have downstream consequences.…”

Section: Discussionsupporting

confidence: 49%

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Wojciechowski

Burda²,

Scheer³

et al. 2018

Acta Bot. Bras.

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Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis raciborskii, Pseudanabaena sp., and Geitlerinema sp.) and of colonial chlorophytes were favored after macrophyte removal, while the abundances of diatoms and flagellates decreased. Our results suggest that removing macrophytes causes dramatic changes in phytoplankton composition and biomass and selects for toxigenic species of cyanobacteria. These changes were probably associated with the disturbance caused by removing the macrophytes, which immediately created new environmental conditions prone to species competition. These findings indicate that the use of mechanical techniques to manage macrophytes should be carefully considered, along with monitoring of harmful species and changes of limnological parameters.

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Section: Discussionsupporting

confidence: 49%

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Wojciechowski

Burda²,

Scheer³

et al. 2018

Acta Bot. Bras.

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“…However, both Burford et al (op cit. ) as other researchers (Bonilla et al, 2012;Marinho et al, 2013;Willis et al, 2015Willis et al, , 2016Wojciechowski et al, 2016;Xiao et al, 2017) emphasized the great intraspecific variation in light requirements and other environmental factors. Kokociński et al (2017) analyzing C. raciborskii invasion and dominance in European aquatic environments, found no correlation with light availability and justifies it because of the great variability among strains in light requirements.…”

Section: Lightmentioning

confidence: 79%

“…Despite the availability of light does not seem to be fundamental to the dominance of C. raciborskii, adaptation to this factor can change its ability to compete with other species of cyanobacteria (Bonilla et al, 2012;Marinho et al, 2013;Xiao et al, 2017). Moore et al (2003) claim that the formation of akinetes occurs in organisms growing only at light intensity higher than 25 µmol photons.m -2 .s -1 and Wojciechowski et al (2016) observed a significant variation in the size of trichomes in strains submitted to different light intensities.…”

Section: Lightmentioning

confidence: 96%

“…Yamamoto & Shiah (2012), Bonilla et al (2012) and Noyma et al (2015) suggested that the adaptation of C. raciborskii to a wide range of irradiance is one of its most important ecological advantages and could have facilitated its dominance. In laboratory conditions, the saturating irradiance (Ik), defined as the ratio of light-saturated growth rate to the initial slope of de growth versus irradiance curve, ranges from 8.5 µmol photons.m -2 .s -1 (Bonilla et al 2012) to 19 µmol photons.m -2 .s -1 (Wojciechowski et al 2016) and 16 to 26 µmol photons.m -2 .s -1 (Briand et al, 2004).…”

Section: Lightmentioning

confidence: 99%

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Autecology of Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju

2020

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Aim Cylindrospermopsis raciborskii (Woloszynska) Seenayya and Subba Raju, also called Raphidiopsis raciborskii, is a diazotrophic and filamentous cyanobacterium with terminal heterocytes, belonging to the order Nostocales. It has been the focus of several studies due to its toxicity and wide geographic distribution. Methods To understand its autecology and to identify the key factors that control its dominance, the present review discusses, based on recent publications, whether the expansion of this species is a result of a high metabolic plasticity or the existence of distinct ecotypes. Results Among the factors influencing C. raciborskii growth are its ability to survive in wide temperature, light intensity and pH ranges; to dominate in both stratified and mixed environments; to tolerate oligohaline conditions; to produce and secrete allelopathic substances; suffer little herbivore pressure; and although associated with a eutrophic environment, to tolerate low concentration of phosphorus and nitrogen with a high affinity for ammonia. Conclusions Due to these differences in the environmental conditions of growth and development found in various studies, we suggest the existence of different ecotypes that will predominate under specific environmental conditions as the most appropriate hypothesis.

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“…In subtropical latitudes, there is a moderate decline of insolation (900 W m À2 , comparatively lower than 1300 W m À2 , the maximum daily solar radiation during summer; Wojciechowski, Fernandes & Fonseca, 2016) coupled with shorter days in fall and winter. We found that higher values of beta diversity were related to lower insolation.…”

Section: Variation In Phytoplankton Communities In the Face Of Enviromentioning

confidence: 99%

Temporal variation in phytoplankton beta diversity patterns and metacommunity structures across subtropical reservoirs

et al. 2017

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Summary Analysing the beta diversity components and spatial patterns of species distribution may provide key insights into how local communities respond to human‐induced environmental changes. Indeed, analysing temporal variation in spatial patterns of species distribution may reveal trends of biotic homogenisation and its likely causes. We used an eight‐year phytoplankton data set generated from to 17 reservoirs in Brazil to analyse the temporal variability in beta diversity and its turnover and nestedness components. This data set was also used to determine metacommunity structures across these subtropical reservoirs. We tested whether there was any long‐term temporal trend in beta diversity that might be indicative of biotic homogenisation or differentiation. We also tested how temporal variation was related to climatic conditions, environmental heterogeneity, productivity and cyanobacterial dominance. Lastly, we verified whether the phytoplankton metacommunity showed non‐random structure. We did not find supporting evidence for biotic homogenisation among the reservoirs. Rather, we did find that nestedness decreased during the study. Environmental heterogeneity was the main variable positively related to phytoplankton beta diversity, while high ammonium concentration and cyanobacterial abundance were negatively correlated with spatial variation among the reservoirs. Despite the noticeable temporal variation in metacommunity structures, the phytoplankton species responded similar to latent environmental gradients. Clementsian patterns found mainly in fall and winter were consistent with differences in species composition between sites, reinforcing the role of environmental filtering in driving changes in these metacommunities. Our results suggest that eutrophication control is essential to prevent biotic homogenisation, at least in our study system. We also highlight that metacommunity patterns detected in snapshot surveys should not be extrapolated temporally.

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

Cited by 7 publications

References 36 publications

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Autecology of Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju

Temporal variation in phytoplankton beta diversity patterns and metacommunity structures across subtropical reservoirs

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