Abstract
A survey was conducted for production of the reactive oxygen species superoxide by 37 species (65 strains) of microalgae including dinoflagellates, raphidophytes, chlorophytes, prasinophytes, eustigmatophytes and prymnesiophytes. Ichthyotoxic raphidophyte species of Chattonella were found to produce the highest environmental levels of superoxide (177×104 total chemiluminescence units). However, ichthyotoxic dinoflagellates (Karenia, Alexandrium) and the prymnesiophyte Prymnesium were also found to produce significant levels of superoxide (4×104, 3×104 and 5×104 chemiluminescence units, respectively), equivalent to that of other raphidophyte species of Heterosigma and Fibrocapsa (6×104 and 2×104, respectively). A direct relationship between cell size and superoxide production was observed (r2=0.94), with larger cells producing more superoxide per cell. Chattonella produced the most superoxide per cell (expressed as cellular chemiluminescence units), followed by the dinoflagellate species Karenia, Alexandrium, Takayama and Gymnodinium. Small cells, such as the raphidophyte Heterosigma and the prymnesiophyte Prymnesium produced very little superoxide per cell (cellular chemiluminescence units), but potentially could still produce high total levels of superoxide if present at high biomass levels. Species commonly used as aquaculture bivalve feeds such as Dunaliella, Tetraselmis, Nannochloropsis and Pavlova produced negligible levels of superoxide, even at high biomass. We speculate that superoxide, while not the sole ichthyotoxic principle, may play a wider role in algal toxicity than previously considered, and propose a broad classification of microalgae based upon superoxide production.
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Acknowledgements
We thank the following people from the University of Tasmania: Drs. Luis Apiolaza and Mark Hovenden for mathematical enlightenment, Helen Bond of the School of Plant Science for culturing assistance, and Dr. Tom Ross for reviewing the manuscript. The work was partially supported by an Australian Research Council grant.
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Communicated by M.S. Johnson, Crawley
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Marshall, JA., de Salas, M., Oda, T. et al. Superoxide production by marine microalgae. Marine Biology 147, 533–540 (2005). https://doi.org/10.1007/s00227-005-1596-7
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DOI: https://doi.org/10.1007/s00227-005-1596-7