Timing and duration of growth hiatuses in mid Holocene massive Porites corals from the northern South China Sea

Yu, Ke-Fu, Zhao, Jian-Xin, Lawrence, Michael G. and Feng, Yuexing (2010) Timing and duration of growth hiatuses in mid Holocene massive Porites corals from the northern South China Sea. Journal of Quaternary Science, 25 8: 1284-1292. doi:10.1002/jqs.1410


Author Yu, Ke-Fu
Zhao, Jian-Xin
Lawrence, Michael G.
Feng, Yuexing
Title Timing and duration of growth hiatuses in mid Holocene massive Porites corals from the northern South China Sea
Journal name Journal of Quaternary Science   Check publisher's open access policy
ISSN 0267-8179
1099-1417
Publication date 2010-12
Sub-type Article (original research)
DOI 10.1002/jqs.1410
Volume 25
Issue 8
Start page 1284
End page 1292
Total pages 9
Place of publication Bognor Regis, U.K.
Publisher John Wiley & Sons
Collection year 2011
Language eng
Subject 0403 Geology
0406 Physical Geography and Environmental Geoscience
Abstract Growth hiatuses in massive corals are usually indicative of past ecological or environmental stresses. Among 37 fossil Porites colonies surveyed from the reef flat of Dadonghai fringing reef at Sanya, Hainan Island, northern South China Sea, seven of them were found to show clear evidence of past mortality, representing a population of -19%. Among these samples, two of them (SYO-13 and SYO-28) display clear growth hiatuses reflecting mortality followed by subsequent recruitment, and five others exhibit a well-preserved mortality surface and no subsequent recruitment. The growth hiatuses were dated using high-precision thermal ionisation mass spectrometry U-series techniques. The age results suggest all the dated corals formed and died in the mid Holocene. Multiple dates below the growth hiatuses suggest that SYO-13 and SYO-28 died at 6298-±-11 and 6929-±-19 a BP (i.e. years before AD 1950), respectively. Multiple dates above the growth hiatuses indicate that growth in SYO-13 and SYO-28 resumed at 6257-±-14 and 6898-±-20 a BP, respectively. The calculated durations of growth hiatuses are therefore 41-±-18 a for SYO-13 and 31-±-28 a for SYO-28, respectively, implying growth resumed within decades after the mortality events. U-series dating of four other samples with dead heads suggests that they died at 6035-±-53, 6059-±-23, 6127-±-22 and 6474-±-24 a BP, respectively. In addition, using solution inductively coupled plasma mass spectrometry (ICP-MS), monthly resolution Sr/Ca and Mg/Ca ratios were determined for the annual growth bands below and above the growth hiatuses for three of the dated samples. The Sr/Ca and Mg/Ca profiles indicate that the three corals probably died in different seasons (from spring to autumn), and the mortality appears to be unrelated to anomalous sea surface temperature-induced bleaching. © 2010 John Wiley & Sons, Ltd.
Keyword coral mortality
coral recovery
mid Holocene
U-series dating
South China Sea
Great Barrier Reef
Surface Temperature
Leizhou Peninsula
Bleaching Event
Lutea corals
Mortality
SR/CA
Delta-O-18
MG/CA
Australia
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 23 NOV 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Centre for Microscopy and Microanalysis Publications
 
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Created: Sun, 16 Jan 2011, 00:04:20 EST