Zooxanthellae harvested by ciliates associated with brown band syndrome of corals remain photosynthetically competent

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dc.contributor.author Ulstrup, Karin Elizabeth en_US
dc.contributor.author Kuhl, Michael en_US
dc.contributor.author Bourne, Dg en_US
dc.date.accessioned 2009-12-21T02:30:22Z
dc.date.available 2009-12-21T02:30:22Z
dc.date.issued 2007 en_US
dc.identifier 2006011497 en_US
dc.identifier.citation Ulstrup Karin Elizabeth, Kuhl Michael, and Bourne Dg 2007, 'Zooxanthellae harvested by ciliates associated with brown band syndrome of corals remain photosynthetically competent', Amer Soc Microbiology, vol. 73, no. 6, pp. 1968-1975. en_US
dc.identifier.issn 0099-2240 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3860
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 cilates (>50 dinoflagellates per ciliate). Microscale oxygen measurements and variable chlorophyll a fluorescence analysis along the 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 measuresvariable chlorophyll a fluorescence. Extended light exposure of steady-state light curves resulted in higher quantum yields of photosystem II. The bronw 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 ghigher gross photosynthesis rates in the zone with zooxanthellae containing ciliates compard to healthy coral tissuing. The observation of photosynthetially 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. It remains to be shown whether the zooxanthellae form a stable symbiotic association with teh ciliate or are engulfed incidentally during grazing on coral tissue and then maintianed as active inside the ciliate for a period before being digested and replaced by new zooxanthellae. en_US
dc.publisher Amer Soc Microbiology en_US
dc.relation.isbasedon http://dx.doi.org/10.1128/AEM.02292-06 en_US
dc.title Zooxanthellae harvested by ciliates associated with brown band syndrome of corals remain photosynthetically competent en_US
dc.parent Applied And Environmental Microbiology en_US
dc.journal.volume 73 en_US
dc.journal.number 6 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.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 060500 en_US
dc.personcode 10018923 en_US
dc.personcode 107129 en_US
dc.personcode 0000032711 en_US
dc.percentage 50 en_US
dc.classification.name Microbiology en_US
dc.classification.type FOR-08 en_US
dc.description.keywords N/A en_US

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