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Article

Is the Cyanobacterial Bloom Composition Shifting Due to Climate Forcing or Nutrient Changes? Example of a Shallow Eutrophic Reservoir

1
ECOBIO (Ecosystems, Biodiversity, Evolution) UMR 6553, University Rennes 1, CNRS, 263 av. du général Leclerc, 35700 Rennes, France
2
Département Santé-Environnement, Agence Régionale de Santé de Bretagne, 32 bd de la Résistance, 56000 Vannes, France
3
Department of Biological Sciences, University of Quebec, C. P. 8888, Succ. Centre-Ville, Montréal, QC H3C 3P8, Canada
*
Author to whom correspondence should be addressed.
Toxins 2021, 13(5), 351; https://doi.org/10.3390/toxins13050351
Received: 30 March 2021 / Revised: 5 May 2021 / Accepted: 11 May 2021 / Published: 13 May 2021
Cyanobacterial blooms in eutrophic freshwater is a global threat to the functioning of ecosystems, human health and the economy. Parties responsible for the ecosystems and human health increasingly demand reliable predictions of cyanobacterial development to support necessary decisions. Long-term data series help with identifying environmental drivers of cyanobacterial developments in the context of climatic and anthropogenic pressure. Here, we analyzed 13 years of eutrophication and climatic data of a shallow temperate reservoir showing a high interannual variability of cyanobacterial development and composition, which is a less occurring and/or less described phenomenon compared to recurrant monospecific blooms. While between 2007–2012 Planktothrix agardhii dominated the cyanobacterial community, it shifted towards Microcystis sp. and then Dolichospermum sp. afterwards (2013–2019). The shift to Microcystis sp. dominance was mainly influenced by generally calmer and warmer conditions. The later shift to Dolichospermum sp. was driven by droughts influencing, amongst others, the N-load, as P remained unchanged over the time period. Both, climatic pressure and N-limitation contributed to the high variability of cyanobacterial blooms and may lead to a new equilibrium. The further reduction of P-load in parallel to the decreasing N-load is important to suppress cyanobacterial blooms and ameliorate ecosystem health. View Full-Text
Keywords: cyanobacteria; eutrophication; long term monitoring; water quality cyanobacteria; eutrophication; long term monitoring; water quality
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MDPI and ACS Style

Le Moal, M.; Pannard, A.; Brient, L.; Richard, B.; Chorin, M.; Mineaud, E.; Wiegand, C. Is the Cyanobacterial Bloom Composition Shifting Due to Climate Forcing or Nutrient Changes? Example of a Shallow Eutrophic Reservoir. Toxins 2021, 13, 351. https://doi.org/10.3390/toxins13050351

AMA Style

Le Moal M, Pannard A, Brient L, Richard B, Chorin M, Mineaud E, Wiegand C. Is the Cyanobacterial Bloom Composition Shifting Due to Climate Forcing or Nutrient Changes? Example of a Shallow Eutrophic Reservoir. Toxins. 2021; 13(5):351. https://doi.org/10.3390/toxins13050351

Chicago/Turabian Style

Le Moal, Morgane, Alexandrine Pannard, Luc Brient, Benjamin Richard, Marion Chorin, Emilien Mineaud, and Claudia Wiegand. 2021. "Is the Cyanobacterial Bloom Composition Shifting Due to Climate Forcing or Nutrient Changes? Example of a Shallow Eutrophic Reservoir" Toxins 13, no. 5: 351. https://doi.org/10.3390/toxins13050351

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