Coral disease physiology: the impact of Acroporid white syndrome on <Emphasis Type="Italic">Symbiodinium</Emphasis> |
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Authors: | G Roff E C E Kvennefors K E Ulstrup M Fine O Hoegh-Guldberg |
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Institution: | 1.ARC Centre of Excellence for Coral Reef Studies, Centre for Marine Studies,University of Queensland,St Lucia,Australia;2.Institute for Water and Environmental Resource Management and Department of Environmental Science,University of Technology, Sydney,Broadway,Australia;3.Faculty of Life Sciences,Bar-Ilan University, The Interuniversity Institute for Marine Science,Eilat,Israel;4.Department of Biology, Marine Biological Laboratory,University of Copenhagen,Helsing?r,Denmark |
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Abstract: | Acroporid white syndrome, a disease-like syndrome from the Great Barrier Reef, results from degenerative host tissue at lesion
borders. Tissue preceding lesion borders appears visually healthy, but it is currently unclear whether the endosymbiotic zooxanthellae
(Symbiodinium) are physiologically impacted. Compared to healthy colonies, this study found no significant differences in symbiont density,
mitotic index or chlorophyll a content in tissue bordering (0 cm), and 8 cm away from white syndrome lesions. Using chlorophyll a fluorescence techniques, the border tissue did not appear to be photosynthetically compromised, and Symbiodinium extracted from this area were photosynthetically competent. Transmission electron microscopy revealed extensive degeneration
of host tissues surrounding symbionts in affected areas, however, Symbiodinium cells were structurally intact with no sign of in situ degradation. Collectively, these results suggest that Symbiodinium at white syndrome lesion borders exist in a dynamic intra-cellular state during active host tissue loss, yet remain physiologically
uncompromised. |
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Keywords: | White syndrome Coral Disease Acropora hyacinthus Symbiodinium |
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