Low symbiont diversity in southern Great Barrier Reef corals, relative to those of the Caribbean

LaJeunesse, Todd C., Loh, William K. W., van Woesik, Robert, Hoegh-Guldberg, Ove, Schmidt, Gregory W. and Fitt, William K. (2003) Low symbiont diversity in southern Great Barrier Reef corals, relative to those of the Caribbean. Limnology And Oceanography, 48 5: 2046-2054. doi:10.4319/lo.2003.48.5.2046

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Author LaJeunesse, Todd C.
Loh, William K. W.
van Woesik, Robert
Hoegh-Guldberg, Ove
Schmidt, Gregory W.
Fitt, William K.
Title Low symbiont diversity in southern Great Barrier Reef corals, relative to those of the Caribbean
Journal name Limnology And Oceanography   Check publisher's open access policy
ISSN 0024-3590
Publication date 2003-09
Year available 2003
Sub-type Article (original research)
DOI 10.4319/lo.2003.48.5.2046
Open Access Status File (Publisher version)
Volume 48
Issue 5
Start page 2046
End page 2054
Total pages 9
Place of publication Waco, TX, United States
Publisher American Society of Limnology and Oceanography
Language eng
Subject C1
06 Biological Sciences
060205 Marine and Estuarine Ecology (incl. Marine Ichthyology)
Abstract The specific identity of endosymbiotic dinoflagellates (Symbiodinium spp.) from most zooxanthellate corals is unknown. In a survey of symbiotic cnidarians from the southern Great Barrier Reef (GBR), 23 symbiont types were identified from 86 host species representing 40 genera. A majority (>85%) of these symbionts belong to a single phylogenetic clade or subgenus (C) composed of closely related (as assessed by sequence data from the internal transcribed spacer region and the ribosomal large subunit gene), yet ecologically and physiologically distinct, types. A few prevalent symbiont types, or generalists, dominate the coral community of the southern GBR, whereas many rare and/or specific symbionts, or specialists, are found uniquely within certain host taxa. The comparison of symbiont diversity between southern GBR and Caribbean reefs shows an inverse relationship between coral diversity and symbiont diversity, perhaps as a consequence of more-rapid diversification of Caribbean symbionts. Among clade C types, generalists C1 and C3 are common to both Caribbean and southern GBR symbiont assemblages, whereas the rest are regionally endemic. Possibly because of environmental changes in the Caribbean after geographic isolation through the Quaternary period, a high proportion of Caribbean fauna associate with symbiont taxa from two other distantly related Symbiodinium clades (A and B) that rarely occur in Pacific hosts. The resilience of Porites spp. and the resistance of Montipora digitata to thermal stress and bleaching are partially explained by their association with a thermally tolerant symbiont type, whereas the indiscriminant widespread bleaching and death among certain Pacific corals, during El Nino Southern Oscillation events, are influenced by associations with symbionts possessing higher sensitivity to thermal stress.
Keyword Limnology
Gymnodinium Microadriaticum Freudenthal
Q-Index Code C1
Institutional Status UQ

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Created: Mon, 13 Aug 2007, 13:49:04 EST