Cover Image

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

Sylvia Bonilla, Mauricio González-Piana, Maria C.S. Soares, Vera L.M. Huszar, Vanessa Becker, Andrea Somma, Marcelo M. Marinho, Mikołaj Kokociński, Martin Dokulil, Dermot Antoniades, Luis Aubriot
  • Mauricio González-Piana
    Universidad de la República, Uruguay
  • Maria C.S. Soares
    Universidade Federal de Juiz de Fora, Brazil
  • Vera L.M. Huszar
    Universidade Federal do Rio de Janeiro, Brazil
  • Vanessa Becker
    Universidade Federal do Rio Grande do Norte, Brazil
  • Andrea Somma
    Universidad de la República, Uruguay
  • Marcelo M. Marinho
    Universidade do Estado do Rio de Janeiro, Brazil
  • Mikołaj Kokociński
    Adam Mickiewicz University, Poland
  • Martin Dokulil
    Austrian Academy of Sciences, Austria
  • Dermot Antoniades
    Université Laval, Canada
  • Luis Aubriot
    Universidad de la República, Uruguay

Abstract

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.

Keywords

Harmful algal blooms (HABs); management; climate change; phenotypic plasticity; water transparency.

Full Text:

PDF
HTML
Submitted: 2016-04-01 22:39:49
Published: 2016-06-22 11:28:45
Search for citations in Google Scholar
Related articles: Google Scholar
Abstract views:
1318

Views:
PDF
544
HTML
521

Article Metrics

Metrics Loading ...

Metrics powered by PLOS ALM


Copyright (c) 2016 Sylvia Bonilla, Mauricio González-Piana, Maria C.S. Soares, Vera L.M. Huszar, Vanessa Becker, Andrea Somma, Marcelo M. Marinho, Mikołaj Kokociński, Martin Dokulil, Dermot Antoniades, Luis Aubriot

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
 
© PAGEPress 2008-2017     -     PAGEPress is a registered trademark property of PAGEPress srl, Italy.     -     VAT: IT02125780185