Spatial heterogeneity of photosynthesis and the effect of temperature-induced bleaching conditions in three species of corals

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Show simple item record Hill, R Schreiber, U Gademann, R Larkum, AWD Kühl, M Ralph, PJ 2009-12-21T02:30:16Z 2004-04
dc.identifier.citation Marine Biology, 2004, 144 (4), pp. 633 - 640
dc.identifier.issn 0025-3162
dc.identifier.other C1 en_US
dc.description.abstract Heterogeneity in photosynthetic performance between polyp and coenosarc tissue in corals was shown using a new variable fluorescence imaging system (Imaging-PAM) with three species of coral, Acropora nobilis, Cyphastrea serailia and Pocillopora damicornis. In comparison to earlier studies with fibre-optic microprobes for fluorescence analysis, the Imaging-PAM enables greater accuracy by allowing different tissues to be better defined and by providing many more data points within a given time. Spatial variability of photosynthetic performance from the tip to the distal parts was revealed in one species of branching coral, A. nobilis. The effect of bleaching conditions (33°C vs. 27°C) was studied over a period of 8 h. Marked changes in fluorescence parameters were observed for all three species. Although a decline in ΦPSII (effective quantum yield) and Yi (the first effective quantum yield obtained from a rapid light curve) were observed, P. damicornis showed no visual signs of bleaching on the Imaging-PAM after this time. In A. nobilis and C. serailia, visual signs of bleaching over the 8 h period were accompanied by marked changes in F (light-adapted fluorescence yield), NPQ (non-photochemical quenching) and Ek (minimum saturating irradiance), as well as ΦPSII and Yi. These changes were most marked over the first 5 h. The most sensitive species was A. nobilis, which after 8 h at 33°C had reached a ΦPSII value of almost zero across its whole surface. Differential bleaching responses between polyps and coenosarc tissue were found in P. damicornis, but not in A. nobilis and C. serailia. NPQ increased with exposure time to 33°C in both the latter species, accompanied by a decreasing Ek, suggesting that the xanthophyll cycle is entrained as a mechanism for reducing the effects of the bleaching conditions. © Springer-Verlag 2004.
dc.language eng
dc.relation.isbasedon 10.1007/s00227-003-1226-1
dc.title Spatial heterogeneity of photosynthesis and the effect of temperature-induced bleaching conditions in three species of corals
dc.type Journal Article
dc.parent Marine Biology
dc.journal.volume 4
dc.journal.volume 144
dc.publocation New York, USA en_US
dc.identifier.startpage 633 en_US
dc.identifier.endpage 640 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 040568
dc.personcode 890085
dc.personcode 111269
dc.personcode 107129
dc.percentage 100 en_US Ecology en_US
dc.classification.type FOR-08 en_US
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 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)

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