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

Ralph, PJ; Larkum, AWD; Kühl, M

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

Ralph, PJ

Larkum, AWD

Kühl, M

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Publication Type:: Journal Article
Citation:: Journal of Experimental Marine Biology and Ecology, 2005, 316 (1), pp. 17 - 28
Issue Date:: 2005-03-09

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Field	Value	Language
dc.contributor.author	Ralph, PJ https://orcid.org/0000-0002-3103-7346	en_US
dc.contributor.author	Larkum, AWD https://orcid.org/0000-0002-0420-134X	en_US
dc.contributor.author	Kühl, M https://orcid.org/0000-0002-1792-4790	en_US
dc.date.issued	2005-03-09	en_US
dc.identifier.citation	Journal of Experimental Marine Biology and Ecology, 2005, 316 (1), pp. 17 - 28	en_US
dc.identifier.issn	0022-0981	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.	en_US
dc.relation	http://purl.org/au-research/grants/arc/DP0558946
dc.relation.ispartof	Journal of Experimental Marine Biology and Ecology	en_US
dc.relation.isbasedon	10.1016/j.jembe.2004.10.003	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Temporal patterns in effective quantum yield of individual zooxanthellae expelled during bleaching	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	316	en_US
utslib.for	060205 Marine and Estuarine Ecology (incl. Marine Ichthyology)	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
pubs.embargo.period	Not known	en_US
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 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	316	en_US

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.

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