Corals escape bleaching in regions that recently and historically experienced frequent thermal stress

Proceedings of the Royal Society B: Biological Sciences - Tập 276 Số 1669 - Trang 2893-2901 - 2009
D. M. Thompson1,2, Robert van Woesik1
1Department of Biological Sciences, Florida Institute of Technology, 150 West University Blvd, Melbourne, FL 32901-6975, USA
2Department of Geosciences, University of Arizona, Gould-Simpson Building #77, 1040 E. 4th St., Tucson, AZ 85721, USA

Tóm tắt

The response of coral-reef ecosystems to contemporary thermal stress may be in part a consequence of recent or historical sea-surface temperature (SST) variability. To test this hypothesis, we examined whether: (i) there was a relationship between the historical frequency of SST variability and stress experienced during the most recent thermal-stress events (in 1998 and 2005–2006) and (ii) coral reefs that historically experienced frequent thermal anomalies were less likely to experience coral bleaching during these recent thermal-stress events. Examination of nine detrended coral δ 18 O and Sr/Ca anomaly records revealed a high- (5.7-year) and low-frequency (>54-year) mode of SST variability. There was a positive relationship between the historical frequency of SST anomalies and recent thermal stress; sites historically dominated by the high-frequency mode experienced greater thermal stress than other sites during both events, and showed extensive coral bleaching in 1998. Nonetheless, in 2005–2006, corals at sites dominated by high-frequency variability showed reduced bleaching, despite experiencing high thermal stress. This bleaching resistance was most likely a consequence of rapid directional selection that followed the extreme thermal event of 1998. However, the benefits of regional resistance could come at the considerable cost of shifts in coral species composition.

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Thông tin xuất bản

Proceedings of the Royal Society B: Biological Sciences

Tập 276 Số 1669

2893-2901

Thông tin tác giả