Zooxanthellae Harvested by Ciliates Associated with Brown Band Syndrome of Corals Remain Photosynthetically Competent

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dc.contributor.author Ulstrup, K
dc.contributor.author Kuhl, M
dc.contributor.author Bourne, DG
dc.date.accessioned 2010-05-28T09:44:20Z
dc.date.issued 2007-01
dc.identifier.citation Applied and Environmental Microbiology, 2007, 73 (11), pp. 1968 - 1975
dc.identifier.issn 0099-2240
dc.identifier.other C3 en_US
dc.identifier.uri http://hdl.handle.net/10453/8599
dc.description.abstract Brown band syndrome is a new coral affliction characterized by a local accumulation of yet-unidentified ciliates migrating as a band along the branches of coral colonies. In the current study, morphologically intact zooxanthellae (= Symbiodinium) were observed in great numbers inside the ciliates (>50 dinoflagellates per ciliate). Microscale oxygen measurements and variable chlorophyll a fluorescence analysis along with microscopic observations demonstrated that zooxanthellae within the ciliates are photosynthetically competent and do not become compromised during the progression of the brown band zone. Zooxanthellae showed similar trends in light acclimation in a comparison of rapid light curve and steady-state light curve measures of variable chlorophyll a fluorescence. Extended light exposure of steady-state light curves resulted in higher quantum yields of photosystem II. The brown band tissue exhibited higher photosynthetically active radiation absorptivity, indicating more efficient light absorption due to a higher density of zooxanthellae in the ciliate-dominated zone. This caused relatively higher gross photosynthesis rates in the zone with zooxanthella-containing ciliates compared to healthy coral tissue. The observation of photosynthetically active intracellular zooxanthellae in the ciliates suggests that the latter can benefit from photosynthates produced by ingested zooxanthellae and from photosynthetic oxygen production that alleviates diffusion limitation of oxic respiration in the densely populated brown band tissue.
dc.publisher Amer Soc Microbiology
dc.relation.isbasedon 10.1128/AEM.02292-06
dc.subject NA, Microbiology
dc.subject NA; Microbiology
dc.title Zooxanthellae Harvested by Ciliates Associated with Brown Band Syndrome of Corals Remain Photosynthetically Competent
dc.type Journal Article
dc.parent Applied and Environmental Microbiology
dc.journal.volume 11
dc.journal.volume 73
dc.journal.number 11 en_US
dc.publocation Washington DC, USA en_US
dc.identifier.startpage 1968 en_US
dc.identifier.endpage 1975 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0605 Microbiology
dc.personcode 10018923 en_US
dc.personcode 107129 en_US
dc.personcode 0000061256 en_US
dc.percentage 100 en_US
dc.classification.name Microbiology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords NA en_US
dc.description.keywords NA
dc.description.keywords NA
dc.description.keywords NA
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3


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