Spatial heterogeneity of photosynthetic activity within diseased corals from the great barrier reef

Roff, George, Ulstrup, Karin E., Fine, Maoz, Ralph, Peter J. and Hoegh-Guldberg, Ove (2008) Spatial heterogeneity of photosynthetic activity within diseased corals from the great barrier reef. Journal of Phycology, 44 2: 526-538. doi:10.1111/j.1529-8817.2008.00480.x

Author Roff, George
Ulstrup, Karin E.
Fine, Maoz
Ralph, Peter J.
Hoegh-Guldberg, Ove
Title Spatial heterogeneity of photosynthetic activity within diseased corals from the great barrier reef
Journal name Journal of Phycology   Check publisher's open access policy
ISSN 0022-3646
Publication date 2008-04-01
Year available 2008
Sub-type Article (original research)
DOI 10.1111/j.1529-8817.2008.00480.x
Open Access Status Not yet assessed
Volume 44
Issue 2
Start page 526
End page 538
Total pages 13
Editor R. Sheath
Place of publication Oxford, England
Publisher Wiley-Blackwell Publishing, Inc.
Language eng
Subject C1
960808 Marine Flora, Fauna and Biodiversity
060203 Ecological Physiology
Abstract Morphological diagnosis and descriptions of seven disease-like syndromes affecting scleractinian corals were characterized from the southern Great Barrier Reef (GBR). Chl a fluorescence of PSII was measured using an Imaging-PAM (pulse amplitude modulated) fluorometer, enabling visualization of the two-dimensional variability in the photophysiology of endosymbiotic dinoflagellates (zooxanthellae) by measuring rapid light curves. Three of four syndromes associated with active tissue loss (type a) were spatially homogenous (white syndrome, brown band, and skeletal eroding band), with no impact on the photochemical function of zooxanthellae populations at or behind the lesion borders. However, a decline in maximum quantum yield (Fv/Fm) and elevated levels of maximum nonphotochemical quenching (NPQmax) occurred in visually healthy tissue of black band disease adjacent to the lesion borders, possibly due to hypoxic conditions caused by the black band cyanobacterial mat. Two out of three syndromes associated with pathological change of intact tissue with no active tissue loss (type b) showed variable photophysiological responses (neoplasia and pigmentation response). Only the bleached foci associated with white patch syndrome appeared to impact primarily on the symbiotic dinoflagellates, as evidenced by declines in minimum fluorescence (F0) and maximum quantum yield (Fv/Fm), with no indication of degeneration in the host tissues. Our results suggest that for the majority of coral syndromes from the GBR, pathogenesis occurs in the host tissue, while the impact on the zooxanthellae populations residing in affected corals is minimal.
Keyword chlorophyll a fluorescence
pulse-amplitude-modulated fluorometry
rapid light curves
symbiotic dinoflagellates
white syndrome
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published Online: 14 Apr 2008

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Centre for Marine Studies Publications
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 16 Apr 2009, 22:46:29 EST by Peter Fogarty on behalf of Centre for Marine Studies