Ecology of the ciguatera causing dinoflagellates from the Northern Great Barrier Reef: Changes in community distribution and coastal eutrophication

Skinner, Mark P., Lewis, Richard J. and Morton, Steve (2013) Ecology of the ciguatera causing dinoflagellates from the Northern Great Barrier Reef: Changes in community distribution and coastal eutrophication. Marine Pollution Bulletin, 77 1-2: 210-219. doi:10.1016/j.marpolbul.2013.10.003


Author Skinner, Mark P.
Lewis, Richard J.
Morton, Steve
Title Ecology of the ciguatera causing dinoflagellates from the Northern Great Barrier Reef: Changes in community distribution and coastal eutrophication
Journal name Marine Pollution Bulletin   Check publisher's open access policy
ISSN 0025-326X
1879-3363
Publication date 2013-12-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.marpolbul.2013.10.003
Volume 77
Issue 1-2
Start page 210
End page 219
Total pages 10
Place of publication London, United Kingdom
Publisher Elsevier Ltd
Language eng
Subject 1104 Complementary and Alternative Medicine
1910 Oceanography
2310 Pollution
Abstract Ciguatera fish poisoning (CFP) is known to be caused by the ciguatoxins from the dinoflagellate genus Gambierdiscus, however, there is the potential for other toxins such as okadaic acid and dinophysistoxins from the genus Prorocentrum, and palytoxin from the genus Ostreopsis, to contaminate seafood. These genera may also be indicators of ecosystem health and potentially impact on coral reef ecosystems and the role they may play in the succession of coral to macroalgae dominated reefs has not been researched. Sixteen GBR field sites spanning inshore, mid-lagoon and outer lagoon (offshore) regions were studied. Samples were collected from September 2006 to December 2007 and abundance of benthic dinoflagellates on different host macroalgae and concentration of nutrients present in the water column were determined. The maximum abundance of Prorocentrum, Ostreopsis and Gambierdiscus found was 112, 793 and 50 cells per gram wet weight of host macroalgae, respectively. The average level of Dissolved Inorganic Nitrogen (DIN) in the water column across all sites (0.03. mg/L) was found to be more than double the threshold critical value (0.013. mg/L) for healthy coral reefs. Compared to a previous study 1984, there is evidence of a major shift in the distribution and abundance of these dinoflagellates. Inshore reefs have either of Prorocentrum (as at Green Island) or Ostreopsis (as at Magnetic Island) dominating the macroalgal surface niche which was once dominated by Gambierdiscus, whilst at offshore regions Gambierdiscus is still dominant. This succession may be linked to the ongoing eutrophication of the GBR lagoon and have consequences for the sources of toxins for ongoing cases of ciguatera.
Keyword Ciguatera
Dinoflagellates
Gambierdiscus
Nutrients
Ostreopsis
Prorocentrum
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Tue, 10 Dec 2013, 10:53:21 EST by System User on behalf of National Res Centre For Environmental Toxicology