Unexpected brevetoxin vectors may account for deaths long after or remote from an algal bloom.
Abstract
Potent marine neurotoxins known as brevetoxins are produced by the ‘red tide’ dinoflagellate Karenia brevis. They kill large numbers of fish and cause illness in humans who ingest toxic filter-feeding shellfish or inhale toxic aerosols1. The toxins are also suspected of having been involved in events in which many manatees and dolphins died, but this has usually not been verified owing to limited confirmation of toxin exposure, unexplained intoxication mechanisms and complicating pathologies2,3,4. Here we show that fish and seagrass can accumulate high concentrations of brevetoxins and that these have acted as toxin vectors during recent deaths of dolphins and manatees, respectively. Our results challenge claims that the deleterious effects of a brevetoxin on fish (ichthyotoxicity) preclude its accumulation in live fish, and they reveal a new vector mechanism for brevetoxin spread through food webs that poses a threat to upper trophic levels.
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References
Steidinger, K. A. in Algal Toxins in Seafood and Drinking Water (ed. Falconer, I.) 1–28 (Academic, London, 1993).
Geraci, J. R. Clinical Investigation of the 1987–1988 Mass Mortality of Bottlenose Dolphins along the US Central and South Atlantic Coast. Report to the National Marine Fisheries Service and US Navy, Office of Naval Research and Marine Mammal Commission (Ontario Veterinary College, Guelph, Ontario, 1989).
O'Shea, T. J., Bonde, R. K., Buergelt, C. D. & Odell, D. K. Mar. Mamm. Sci. 7, 165–179 (1991).
Van Dolah, F. M., Doucette, G. J., Gulland, F. M. D., Rowles, T. L. & Bossart, G. D. in Toxicology of Marine Mammals (eds Vos, J. G., Bossart, G. D., Fournier, M. & O'Shea, T. J.) 247–269 (Taylor & Francis, New York, 2003).
Bossart, G. D., Baden, D. G., Ewing, R. Y., Roberts, B. & Wright, S. D. Toxicol. Pathol. 26, 276–282 (1998).
Working Group on Marine Mammal Unusual Mortality Events The Bottlenose Dolphin (Tursiops truncatus): Unusual Mortality Event along the Panhandle of Florida March–April 2004 (National Marine Fisheries Service, 2004).
Baden, D. G. & Mende, T. J. Toxicon 20, 457–461 (1982).
Pierce, R. H., Henry, M. S., Blum, P. & Payne, S. in Harmful Algal Blooms 2000 (eds Hallegraeff, G. M. et al.) 421–424 (Intergovernmental Oceanic Commission, Paris, 2001).
Ross, P. S. Hum. Ecol. Risk Ass. 6, 29–46 (2000).
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Flewelling, L., Naar, J., Abbott, J. et al. Red tides and marine mammal mortalities. Nature 435, 755–756 (2005). https://doi.org/10.1038/nature435755a
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DOI: https://doi.org/10.1038/nature435755a
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