Abstract
Coral bleaching, characterized by a significant loss of symbiotic zooxanthellae, is the primary cause of mass coral mortality and reef degradation throughout the world. The characteristics, processes, and resistance of corals to bleaching varies significantly and is dependent on environmental conditions. We documented a mass coral bleaching event in June 2007 at the Meiji and Zhubi Reefs, Nansha Islands (NS), South China Sea using ecological surveys and measurement of coral zooxanthellae density and sea surface temperatures (SST). More than 35 species of corals (between 0–20 m in depth) were bleached. These bleached corals accounted for 15.6% of total corals in the investigated quadrats. The branching corals Pocillopora and Acropora were the most vulnerable species whereas the massive corals Porites and Favia were more tolerant of the high SSTs. Surprisingly, we found no evidence of bleaching in Agariciidae corals suggesting that this family is resistant to thermal stresses. The bleached corals had lost 72%–90% of their symbiotic zooxanthellae. Furthermore, corals that had no visual signs of bleaching had also lost 31%–53% of their zooxanthellae suggesting that most corals were experiencing the early stage of bleaching. The monthly mean SST during June 2007 was 30.8°C, the highest since 1998. Based on measurements of SST and the Hotspots and DHW data (NOAA), we conclude that it the extremely high SSTs triggered this coral bleaching event. Our results suggest that the previously accepted temperature thresholds used to predict coral bleaching based on satellite data are likely to underestimate the extent and intensity of coral bleaching, at least in the NS.
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Li S, Yu K F. Recent development in coral reef bleaching research (in Chinese). Acta Ecol Sin, 2007, 27: 2059–2069
Hoegh-Guldberg O. Climate change, coral bleaching and the future of the world’s coral reefs. Mar Freshwater Res, 1999, 50: 839–866
Baker A, Glynn P, Riegl B. Climate change and coral reef bleaching: An ecological assessment of long-term impacts, recovery trends and future outlook. Est Coast Shelf Sci, 2008, 80: 435–471
Wilkinson C. Status of coral reefs of the world: 2002. Townsville: Global Coral Reef Monitoring Network and Reef and Rainforest Research Centre, 2002. 1–377
Carpenter K, Abrar M, Aeby G, et al. One-third of reef-building corals face elevated extinction risk from climate change and local impacts. Science, 2008, 321: 560–563
Wilkinson C. Status of coral reefs of the world: 2008. Townsville: Global Coral Reef Monitoring Network and Reef and Rainforest Research Centre, 2008. 1–296
Yu K F, Zhao J X. Coral Reefs. In: Wang P X, Li Q Y. The South China Sea Paleoceanography and Sedimentology. Berlin: Springer, 2009. 229–254
Arceo H O, Quibilan M C, Alino P M, et al. Coral bleaching in Philippine reefs: Coincident evidences with mesoscale thermal anomalies. Bull Mar Sci, 2001, 69: 579–593
Cesar H, Pet-Soede L, Quibilan M C C, et al. First evaluation of the impacts of the 1998 coral bleaching event to fisheries and tourism in the Philippines. In: Schuttenberg H Z, ed. Coral Bleaching: Assessing and Linking Ecological and Socioeconomic Impacts, Future Trends and Mitigation Planning. Kingston: University of Rhode Island, 2000. 41–58
Yu K F, Zhao J X, Shi Q, et al. U-series dating of dead Porites corals in the South China sea: Evidence for episodic coral mortality over the past two centuries. Quat Geochronol, 2006, 1: 129–141
Johannes R E, Wiebe W J. Method for determination of coral tissue biomass and composition. Limnol Oceanogr, 1970, 15: 822–824
Li S, Yu K F, Shi Q, et al. Interspecies and spatial diversity in the symbiotic zooxanthellae density in corals from northern South China Sea and its relationship to coral reef bleaching. Chinese Sci Bull. 2008, 53: 295–303
Hoegh-Guldberg O, Salvat B. Periodic mass-bleaching and elevated sea temperatures: Bleaching of outer reef slope communities in Moo-rea, French Polynesia. Mar Ecol Prog Ser, 1995, 121: 181–190
Stimson J, Sakai K, Sembali H. Interspecific comparison of the symbiotic relationship in corals with high and low rates of bleaching-induced mortality. Coral Reefs, 2002, 21: 409–421
Costa C F, Sassi R, Amaral F D. Annual cycle of symbiotic dinoflagellates from three species of scleractinian corals from coastal reefs of northeastern Brazil. Coral Reefs, 2005, 24: 191–193
Fagoonee I, Wilson H B, Hassell M P, et al. The dynamics of zooxanthellae populations: A long-term study in the field. Science, 1999, 283: 843–845
Brown B E, Letissier M D A, Bythell J C. Mechanisms of bleaching deduced from histological studies of reef corals sampled during a natural bleaching event. Mar Biol, 1995, 122: 655–663
Harithsa S, Raghukumar C, Dalal S. Stress response of two coral species in the Kavaratti atoll of the Lakshadweep Archipelago, India. Coral reefs, 2005, 24: 463–474
Li S, Yu K F, Shi Q, et al. Low water temperature tolerance and responding mode of scleractinian corals in Sanya Bay (in Chinese). Chin J Appl Ecol, 2009, 20: 2289–2295
Li S, Yu K F, Shi Q. Experimental study of stony coral response to the high temperature in Luhuitou of Hainan Island (in Chinese). Trop Geogr, 2008, 28: 534–539
Loya Y, Sakai K, Yamazato K, et al. Coral bleaching: The winners and the losers. Ecol Lett, 2001, 4: 122–131
Edwards A J, Clark S, Zahir H, et al. Coral bleaching and mortality on artificial and natural reefs in Maldives in 1998, sea surface temperature anomalies and initial recovery. Mar Pollut Bull, 2001, 42}: 7–
Lough J M. 1997–98: Unprecedented thermal stress to coral reefs? Geophys Res Lett, 2000, 27: 3901–3904
Liu G, Strong A E, Skirving W. Overview of NOAA coral reef watch program’s near-real time satellite global coral bleaching monitoring activities. Proc 10th Int Coral Reef Symp. 2005, 1: 1783–1793
McClanahan T R, Ateweberhan M, Sebastian C R, et al. Predictability of coral bleaching from synoptic satellite and in situ temperature observations. Coral Reefs, 2007, 26: 695–701
Kimura T, Dai C F, Park H S. Status of Coral Reef Resources in East and North Asia (China, Hong Kong, Taiwan, South Korea and Japan). In: Wilkinson C, eds. Status of Coral Reefs of the World: Townsville: Global Coral Reef Monitoring Network and Reef and Rainforest Research Center, 2008. 145–158
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Li, S., Yu, K., Chen, T. et al. Assessment of coral bleaching using symbiotic zooxanthellae density and satellite remote sensing data in the Nansha Islands, South China Sea. Chin. Sci. Bull. 56, 1031–1037 (2011). https://doi.org/10.1007/s11434-011-4390-6
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DOI: https://doi.org/10.1007/s11434-011-4390-6