Temporal patterns in effective quantum yield of individual zooxanthellae expelled during bleaching

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dc.contributor.author Ralph, PJ
dc.contributor.author Larkum, AWD
dc.contributor.author Kühl, M
dc.date.accessioned 2009-12-21T02:30:19Z
dc.date.issued 2005-03-09
dc.identifier.citation Journal of Experimental Marine Biology and Ecology, 2005, 316 (1), pp. 17 - 28
dc.identifier.issn 0022-0981
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3838
dc.description.abstract Bleaching is a worldwide phenomenon affecting coral reefs. During elevated temperature and light conditions (bleaching), expelled zooxanthellae show distinct patterns in photosynthetic health. An innovative new device was used to collect individual expelled zooxanthellae, when a coral was exposed to bleaching conditions. This has provided new insight into the photosynthetic condition and abundance of expelled zooxanthellae. It has been assumed that expelled zooxanthellae were dead or moribund; however, we have found individual cells can have healthy effective quantum yields (φPSII) >0.65 after 8 h of bleaching conditions (500 μmol photons m-2 s -1, 33°C). The population of expelled zooxanthellae from Cyphastrea serailia and Pocillopora damicornis showed distinct patterns in the frequency distribution of φPSII over time and between locations (sun versus shade) within a colony. During the first 4 h of exposure to bleaching conditions, only 5% of expelled individual cells from P. damicornis were photosynthetically inactive (φPSII<0.05), whereas for C. serailia, this was 30%. The overall photosynthetic health of expelled zooxanthellae from C. serailia was better than P. damicornis (0.53±0.13 and 0.38±0.13 after 8 h, respectively). This was generally reflected by the in hospite measurement of the coral, yet, the in hospite cells always had a higher φPSII than expelled cells, suggesting that host tissue provided added photoprotection for the zooxanthellae. © 2005 Elsevier B.V. All rights reserved.
dc.language eng
dc.relation.isbasedon 10.1016/j.jembe.2004.10.003
dc.title Temporal patterns in effective quantum yield of individual zooxanthellae expelled during bleaching
dc.type Journal Article
dc.parent Journal of Experimental Marine Biology and Ecology
dc.journal.volume 1
dc.journal.volume 316
dc.journal.number 1 en_US
dc.publocation Amsterdam, Netherlands en_US
dc.identifier.startpage 17 en_US
dc.identifier.endpage 28 en_US
dc.cauo.name DVCRch.Institute for Water & Environmental Resource Mgmnt en_US
dc.conference Verified OK en_US
dc.for 060205 Marine and Estuarine Ecology (Incl. Marine Ichthyology)
dc.personcode 890085
dc.personcode 111269
dc.personcode 107129
dc.percentage 100 en_US
dc.classification.name Marine and Estuarine Ecology (incl. Marine Ichthyology) en_US
dc.classification.type FOR-08 en_US
dc.custom 1.588 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 12:17:09.805752+10
pubs.consider-herdc true

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