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

Submitted: 1 April 2016
Accepted: 13 June 2016
Published: 22 June 2016
Abstract Views: 3309
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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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Supporting Agencies

ANII, PEDECIBA
Sylvia Bonilla, Universidad de la República
Sección Limnología
Mauricio González-Piana, Universidad de la República
Research contract
Maria C.S. Soares, Universidade Federal de Juiz de Fora
Professor
Vera L.M. Huszar, Universidade Federal do Rio de Janeiro
Professor
Vanessa Becker, Universidade Federal do Rio Grande do Norte
Professor
Andrea Somma, Universidad de la República
Posgraduate student
Marcelo M. Marinho, Universidade do Estado do Rio de Janeiro
Professor
Mikołaj Kokociński, Adam Mickiewicz University
Professor
Martin Dokulil, Austrian Academy of Sciences
Researcher
Dermot Antoniades, Université Laval
Professor
Luis Aubriot, Universidad de la República
Professor

How to Cite

Bonilla, Sylvia, Mauricio González-Piana, Maria C.S. Soares, Vera L.M. Huszar, Vanessa Becker, Andrea Somma, Marcelo M. Marinho, Mikołaj Kokociński, Martin Dokulil, Dermot Antoniades, and Luis Aubriot. 2016. “The Success of the Cyanobacterium Cylindrospermopsis Raciborskii in Freshwaters Is Enhanced by the Combined Effects of Light Intensity and Temperature”. Journal of Limnology 75 (3). https://doi.org/10.4081/jlimnol.2016.1479.

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