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J. Mar. Sci. Eng. 2015, 3(2), 444-465; doi:10.3390/jmse3020444

Dimethylsulphoniopropionate (DMSP) as an Indicator of Bleaching Tolerance in Scleractinian Corals

Marine Ecology Research Centre, School of Environment, Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia
These two authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Loke Ming Chou
Received: 1 April 2015 / Accepted: 15 June 2015 / Published: 23 June 2015
(This article belongs to the Special Issue Climate Change and Coral Reefs Ecosystems)
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Abstract

Thermal tolerance tests on Acropora millepora, a common Indo-Pacific hard coral, have shown that adult corals can acquire increased thermal tolerance by shuffling existing type C to type D Symbiodinium zooxanthellae when subjected to increased seawater temperatures. We report here dimethylsulphoniopropionate (DMSP) concentrations in A. millepora and examine links between DMSP concentrations, zooxanthellae clade, and bleaching tolerance. DMSP analysis on native and transplanted corals from three locations in the Great Barrier Reef indicated that the lower thermal tolerance in type C zooxanthellae coincided with variable DMSP concentrations, whilst the more thermal tolerant type D zooxanthellae had more stable areal DMSP concentrations as seawater temperatures increased. Our results suggest this increased thermal tolerance in type D zooxanthellae may reflect the ability of these coral symbionts to conserve their antioxidant DMSP levels to relatively constant concentrations, enabling the coral to overcome the build-up of oxygen free radicals in the cytoplasm of A. millepora. A conceptual diagram illustrates how the antioxidants DMS (P) participate in the bleaching process by scavenging oxygen free radicals and form DMSO, thus moderating coral bleaching and increasing thermotolerance. View Full-Text
Keywords: dimethylsulphoniopropionate; coral bleaching; Great Barrier Reef; antioxidants; thermal tolerance; zooxanthellae clades dimethylsulphoniopropionate; coral bleaching; Great Barrier Reef; antioxidants; thermal tolerance; zooxanthellae clades
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jones, G.B.; King, S. Dimethylsulphoniopropionate (DMSP) as an Indicator of Bleaching Tolerance in Scleractinian Corals. J. Mar. Sci. Eng. 2015, 3, 444-465.

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