Zooxanthellae expelled from bleached corals at 33°C are photosynthetically competent

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dc.contributor.author Ralph, PJ
dc.contributor.author Gademann, R
dc.contributor.author Larkum, AWD
dc.date.accessioned 2009-12-21T02:30:06Z
dc.date.issued 2001-09-27
dc.identifier.citation Marine Ecology Progress Series, 2001, 220 pp. 163 - 168
dc.identifier.issn 0171-8630
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3752
dc.description.abstract While a number of factors have been linked to coral bleaching, such as high light, high temperature, low salinity, and UV exposure, the best explanation for recent coral bleaching events are small temperature excursions of 1 to 2°C above summer sea-surface temperatures in the tropics which induce the dinoflagellate symbionts (zooxanthellae) to be expelled from the host. The mechanism that triggers this expulsion of the algal symbionts is not resolved, but has been attributed to damage to the photosynthetic mechanism of the zooxanthellae. In the present investigation we addressed the question of whether such expelled zooxanthellae are indeed impaired irreversibly in their photosynthesis. We employed a Microscopy Pulse Amplitude-Modulated (PAM) fluorometer, by which individual zooxanthellae can be examined to study photosynthesis in zooxanthellae expelled when corals are subjected to a temperature of 33°C. We show that the expelled zooxanthellae from Cyphastrea serailia were largely unaffected in their photosynthesis and could be heated to 37°C before showing temperature-induced photosynthetic impairment. These results suggest strongly that the early events that trigger temperature-induced expulsion of zooxanthellae involve a dysfunction in the interaction of the zooxanthellae and the coral host tissue, and not a dysfunction in the zooxanthellae per se.
dc.language eng
dc.title Zooxanthellae expelled from bleached corals at 33°C are photosynthetically competent
dc.type Journal Article
dc.parent Marine Ecology Progress Series
dc.journal.volume 220
dc.journal.number en_US
dc.publocation Germany en_US
dc.identifier.startpage 163 en_US
dc.identifier.endpage 168 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 050101 Ecological Impacts of Climate Change
dc.for 060705 Plant Physiology
dc.personcode 890085
dc.personcode 111269
dc.percentage 50 en_US
dc.classification.name Plant Physiology en_US
dc.classification.type FOR-08 en_US
dc.description.keywords Chlorophyll fluorescence
dc.description.keywords Coral bleaching
dc.description.keywords PAM
dc.description.keywords Zooxanthellae
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
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:23:47.074767+10
pubs.consider-herdc true
utslib.collection.history Uncategorised (ID: 363)
utslib.collection.history General (ID: 2)

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