Production of the cyanotoxin nodularin—A multifactorial approach

Pattanaik, Bagmi; Wulff, Angela; Roleda, Michael Y.; Garde, Kristine; Mohlin, Malin

doi:10.1016/j.hal.2010.06.001

Cited by 18 publications

(16 citation statements)

References 48 publications

(50 reference statements)

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“…was unaffected by the presence of N. spumigena. The results are consistent with previous observations in a parallel study [41]: No correlation between increased nodularin concentration and the specific growth rate of Aphanizomenon sp. was found.…”

Section: Discussionsupporting

confidence: 93%

Interspecific Resource Competition—Combined Effects of Radiation and Nutrient Limitation on Two Diazotrophic Filamentous Cyanobacteria

et al. 2011

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The cyanobacterial blooms in the Baltic Sea are dominated by diazotrophic cyanobacteria, the potentially toxic species Aphanizomenon sp. and the toxic species Nodularia spumigena. The seasonal succession with peaks of Aphanizomenon sp., followed by peaks of N. spumigena, has been explained by the species-specific niches of the two species. In a three-factorial outdoor experiment, we tested if nutrient and radiation conditions may impact physiological and biochemical responses of N. spumigena and Aphanizomenon sp. in the presence or absence of the other species. The two nutrient treatments were f/2 medium without NO (3) (-) (-N) and f/2 medium without PO (4) (3-) (-P), and the two ambient radiation treatments were photosynthetic active radiation >395 nm (PAR) and PAR + UV-A + UV-B >295 nm. The study showed that Aphanizomenon sp. was not negatively affected by the presence of N. spumigena and that N. spumigena was better adapted to both N and P limitation in interaction with ultraviolet radiation (UVR, 280-400 nm). In the Baltic Sea, these physical conditions are likely to prevail in the surface water during summer. Interestingly, the specific growth rate of N. spumigena was stimulated by the presence of Aphanizomenon sp. We suggest that the seasonal succession, with peaks of Aphanizomenon sp. followed by peaks of N. spumigena, is a result from species-specific preferences of environmental conditions and/or stimulation by Aphanizomenon sp. rather than an allelopathic effect of N. spumigena. The results from our study, together with a predicted stronger stratification due to effects of climate change in the Baltic Sea with increased temperature and increased precipitation and increased UV-B due to ozone losses, reflect a scenario with a continuing future dominance of the toxic N. spumigena.

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Section: Discussionsupporting

confidence: 93%

Interspecific Resource Competition—Combined Effects of Radiation and Nutrient Limitation on Two Diazotrophic Filamentous Cyanobacteria

et al. 2011

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“…Moreover, from a series of experiments, it was recently concluded that the presence of N. spumigena had no significant effect on the specific growth rate of Aphanizomenon sp. under different radiation and nutrient treatments (Pattanaik et al 2010;Mohlin et al 2012). These studies were performed under ambient radiation and nutrient stress conditions, where the environmental conditions overrode the potential allelopathic effects.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have shown that the release of nodularin and other secondary metabolites from N. spumigena has an allelopathic effect on other organisms (Sellner 1997;Ibelings and Havens 2008), and Legrand et al (2003) reviewed its importance in phytoplankton competition. However, Pattanaik et al (2010) found that nodularin accumulation and release were dependent on different environmental conditions but did not affect the coexisting species Aphanizomenon sp. Others have suggested that the toxin stimulates the abundance of the same or other cyanobacterial species in the community rather than inhibits the abundance of competitors (Suikkanen et al 2004(Suikkanen et al , 2005.…”

Section: Introductionmentioning

confidence: 87%

“…N. spumigena produces the hepatotoxin nodularin, which can accumulate in the food web with as yet unknown consequences (Sipiä et al 2002;Karjalainen et al 2007). The concentration of nodularin varies under different environmental conditions, such as temperature, salinity, radiation and nutrient concentrations (Lehtimäki et al 1994;Blackburn et al 1996;Granéli et al 1998;Hobson et al 1999;Repka et al 2001;Mazur-Marzec et al 2005;Pattanaik et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, a stagnant water column will expose the species in the euphotic zone to high intensities of ambient radiation. N. spumigena continues to grow under both nutrient deficiency and high ambient radiation intensities (Mohlin and Wulff 2009;Pattanaik et al 2010;Mohlin et al 2012). Furthermore, the stabilization of the water column in association with increasing temperatures may cause the spring bloom to begin earlier (Hagström and Larsson 1984) and potentially also the cyanobacteria bloom.…”

Section: Introductionmentioning

confidence: 99%

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Impact of temperature and species interaction on filamentous cyanobacteria may be more important than salinity and increased pCO2 levels

Karlberg

Wulff

2012

Mar Biol

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A future business-as-usual scenario (A1FI) was tested on two bloom-forming cyanobacteria of the Baltic Proper, Nodularia spumigena and Aphanizomenon sp., growing separately and together. The projected scenario was tested in two laboratory experiments where (a) interactive effects of increased temperature and decreased salinity and (b) interactive effects of increased temperature and elevated levels of pCO 2 were tested. Increased temperature, from 12 to 16°C, had a positive effect on the biovolume and photosynthetic activity (F v /F m ) of both species. Compared when growing separately, the biovolume of each species was lower when grown together. Decreased salinity, from 7 to 4, and elevated levels of pCO 2 , from 380 to 960 ppm, had no effect on the biovolume, but on F v /F m of N. spumigena with higher F v /F m in salinity 7. Our results suggest that the projected A1FI scenario might be beneficial for the two species dominating the extensive summer blooms in the Baltic Proper. However, our results further stress the importance of studying interactions between species.

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Cyanotoxins: producing organisms, occurrence, toxicity, mechanism of action and human health toxicological risk evaluation

et al. 2017

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Cyanobacteria were present on the earth 3.5 billion years ago; since then they have colonized almost all terrestrial and aquatic ecosystems. They produce a high number of bioactive molecules, among which some are cyanotoxins. Cyanobacterial growth at high densities, forming blooms, is increasing in extension and frequency, following anthropogenic activities and climate changes, giving rise to some concern for human health and animal life exposed to cyanotoxins. Numerous cases of lethal poisonings have been associated with cyanotoxins ingestion in wild animal and livestock. In humans few episodes of lethal or severe human poisonings have been recorded after acute or short-term exposure, but the repeated/chronic exposure to low cyanotoxin levels remains a critical issue. The properties of the most frequently detected cyanotoxins (namely, microcystins, nodularins, cylindrospermopsin and neurotoxins) are here critically reviewed, describing for each toxin the available information on producing organisms, biosynthesis/genetic and occurrence, with a focus on the toxicological profile (including kinetics, acute systemic toxicity, mechanism and mode of action, local effects, repeated toxicity, genotoxicity, carcinogenicity, reproductive toxicity; human health effects and epidemiological studies; animal poisoning) with the derivation of health-based values and considerations on the risks for human health.

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Production of the cyanotoxin nodularin—A multifactorial approach

Cited by 18 publications

References 48 publications

Interspecific Resource Competition—Combined Effects of Radiation and Nutrient Limitation on Two Diazotrophic Filamentous Cyanobacteria

Interspecific Resource Competition—Combined Effects of Radiation and Nutrient Limitation on Two Diazotrophic Filamentous Cyanobacteria

Impact of temperature and species interaction on filamentous cyanobacteria may be more important than salinity and increased pCO2 levels

Cyanotoxins: producing organisms, occurrence, toxicity, mechanism of action and human health toxicological risk evaluation

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