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• W2018385710 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 352:137-144 (2007) - DOI: https://doi.org/10.3354/meps07159 Post-bleaching viability of expelled zooxanthellae from the scleractinian coral Pocillopora damicornis Ross Hill, Peter J. Ralph* Institute for Water and Environmental Resource Management and Department of Environmental Sciences, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia *Corresponding author. Email: peter.ralph@uts.edu.au ABSTRACT: Coral bleaching events have been linked to elevated seawater temperatures in combination with intense light and can be characterised by the loss of symbionts (zooxanthellae, genus Symbiodinium) from the host tissue, as well as a reduction in photosynthetic pigments in these zooxanthellae. The long-term (days) viability of expelled zooxanthellae in the water column from the scleractinian coral Pocillopora damicornis was explored in this study through measurements of photosynthetic health and morphological condition. After initial expulsion, zooxanthellae were found to be photosynthetically competent and structurally intact. However, within 6 to 12 h following this time, photosystem II photochemical efficiency dramatically declined in these cells and photosynthetic damage was gradually manifested in the loss of structural integrity of the cell. The time of expulsion during bleaching exposure, as well as ambient water temperature, greatly influenced survivorship. Expelled zooxanthellae were collected at 4 different time intervals (0–6, 6–12, 12–24 and 24–36 h) following the onset of exposure to bleaching conditions (32°C and 400 µmol photons m–2 s–1) and then maintained at 28, 30 or 32°C and 100 µmol photons m–2 s–1 for up to 96 h. Those cells expelled within the first 6 h of bleaching and held at 28°C (lagoon temperature) had the greatest longevity, although even in this treatment, long-term photosynthetic viability was restricted to 5 d in the water column. This suggests that unless expelled zooxanthellae inhabit other environments of coral reefs (such as sediments) which may be more favourable for survival, their capacity for persistence in the environment is extremely limited. KEY WORDS: Coral bleaching · Chlorophyll a fluorescence · Effective quantum yield · Pulse amplitude modulated · PAM · Zooxanthellae · Symbiodinium Full text in pdf format PreviousNextCite this article as: Hill R, Ralph PJ (2007) Post-bleaching viability of expelled zooxanthellae from the scleractinian coral Pocillopora damicornis. Mar Ecol Prog Ser 352:137-144. https://doi.org/10.3354/meps07159 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 352. Online publication date: December 20, 2007 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2007 Inter-Research." @default.
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• W2018385710 title "Post-bleaching viability of expelled zooxanthellae from the scleractinian coral Pocillopora damicornis" @default.
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