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Aspergillus Sydowii marine fungal bloom in Australian coastal waters, its metabolites and potential impact on Symbiodinium dinoflagellates


Hayashi, A and Crombie, A and Lacey, E and Richardson, AJ and Vuong, D and Piggott, AM and Hallegraeff, G, Aspergillus Sydowii marine fungal bloom in Australian coastal waters, its metabolites and potential impact on Symbiodinium dinoflagellates, Marine Drugs, 14, (3) Article 59. ISSN 1660-3397 (2016) [Refereed Article]


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2016 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.3390/md14030059


Dust has been widely recognised as an important source of nutrients in the marine environment and as a vector for transporting pathogenic microorganisms. Disturbingly, in the wake of a dust storm event along the eastern Australian coast line in 2009, the Continuous Plankton Recorder collected masses of fungal spores and mycelia (∼150,000 spores/m3) forming a floating raft that covered a coastal area equivalent to 25 times the surface of England. Cultured A. sydowii strains exhibited varying metabolite profiles, but all produced sydonic acid, a chemotaxonomic marker for A. sydowii. The Australian marine fungal strains share major metabolites and display comparable metabolic diversity to Australian terrestrial strains and to strains pathogenic to Caribbean coral. Secondary colonisation of the rafts by other fungi, including strains of Cladosporium, Penicillium and other Aspergillus species with distinct secondary metabolite profiles, was also encountered. Our bioassays revealed that the dust-derived marine fungal extracts and known A. sydowii metabolites such as sydowic acid, sydowinol and sydowinin A adversely affect photophysiological performance (Fv/Fm) of the coral reef dinoflagellate endosymbiont Symbiodinium. Different Symbiodinium clades exhibited varying sensitivities, mimicking sensitivity to coral bleaching phenomena. The detection of such large amounts of A. sydowii following this dust storm event has potential implications for the health of coral environments such as the Great Barrier Reef.

Item Details

Item Type:Refereed Article
Keywords:marine fungal toxins, Aspergillus sydowii, Symbiodinium, secondary metabolites, sydonic acid, sydowinin, sydowinol, sydonol, coral disease, maximum quantum yield (Fv/Fm)
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Fisheries - aquaculture not elsewhere classified
UTAS Author:Hayashi, A (Ms Aiko Hayashi)
UTAS Author:Hallegraeff, G (Professor Gustaaf Hallegraeff)
ID Code:107498
Year Published:2016
Funding Support:Australian Research Council (DP130102725)
Web of Science® Times Cited:9
Deposited By:Ecology and Biodiversity
Deposited On:2016-03-17
Last Modified:2018-04-11
Downloads:177 View Download Statistics

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