The Effects of Interspecific Interactions Between Bloom Forming Cyanobacteria and Scenedesmus quadricauda (Chlorophyta) on Their Photophysiology

Abstract

Eutrophication and enhanced external nutrient loading of lakes and seas are most clearly reflected by increased cyanobacterial blooms, which are often toxic. Freshwater cyanobacteria produce a number of bioactive secondary metabolites, some of which have allelopathic properties, significantly influencing the biological processes of other algae, thereby affecting species composition and succession of the phytoplankton. The goal of this work was to investigate the influence of bloom-forming cyanobacterial exudates on the photophysiology of the green alga Scenedesmus quadricauda by chlorophyll fluorescence analysis. We were able to prove the effect of algal cell-free fltrates on the performance of S. quadricauda and demonstrate for the first time that the freshwater picocyanobacterium Cyanobium gracile has strong negative impact on the coexisting green alga. Neither the cyanotoxin (MYC, CYN and ATX) producing, nor the non-toxic strains showed any systematic effect on the production of S. quadricauda. Various strains of the cyanobacterium Cylindrospermopsis raciborskii inhibited the performance of the green alga independently of their origin. Our results urge further studies for a better understanding of the factors affecting the release of allelopathic compounds and the mechanisms of their effects on target organisms.

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Acknowledgements

The research was supported by the Bolyai Research Fund. We are grateful to Martin L. Saker (Interdisciplinary Centre of Marine and Environmental Research, CIIMAR, University of Porto, Portugal) for the C. raciborskii strain of AQS.

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Correspondence to Attila W. Kovács.

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Kovács, A.W., Tóth, V.R. & Pálffy, K. The Effects of Interspecific Interactions Between Bloom Forming Cyanobacteria and Scenedesmus quadricauda (Chlorophyta) on Their Photophysiology. BIOLOGIA FUTURA 69, 210–223 (2018). https://doi.org/10.1556/018.69.2018.2.9

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Keyword

  • Allelopathy
  • cell-free extract
  • chlorophyll fluorescence
  • rapid light curves
  • Cylindrospermopsis raciborskii
  • picocyanobacteria