CHEN Tianran, LI Shu, SHI Qi, CHEN Tegu. Cold tolerance of subtropical Porites lutea from the northern South China Sea[J]. Acta Oceanologica Sinica, 2016, 35(12): 58-64. doi: 10.1007/s13131-016-0940-8
Citation: CHEN Tianran, LI Shu, SHI Qi, CHEN Tegu. Cold tolerance of subtropical Porites lutea from the northern South China Sea[J]. Acta Oceanologica Sinica, 2016, 35(12): 58-64. doi: 10.1007/s13131-016-0940-8

Cold tolerance of subtropical Porites lutea from the northern South China Sea

doi: 10.1007/s13131-016-0940-8
  • Received Date: 2015-08-07
  • Rev Recd Date: 2016-07-29
  • Marginal scleractinian corals growing at their latitudinal limits should be quite sensitive to variations in winter sea surface temperatures (SSTs). An extreme cold event occurring in early 2008 offered a unique opportunity to examine the effect of cold-water anomalies on Porites lutea corals and their physiological tolerance and acclimation in the subtropical northern South China Sea (NSCS). Besides in-situ observation, a subsequent aquarium-based experiment was designed for reproducing the chilling process and a 50-year-long Sr/Ca ratio profile from two P. lutea skeletal slabs was analyzed for reconstructed the historical annual minimum SSTs which ceased Porites calcification. The 2008 low-temperature anomaly caused the minimum daily mean SSTs dropped below 13℃ in the Daya Bay. The stress symptoms displayed by local P. lutea colonies included polyp retraction, reduced coloration and pale, but none showed tissue sloughing. The ability of P. lutea to survive implied its tolerance of extreme low temperatures. Here we suggest a model on the tolerance of high-latitude Porites under low-temperature stresses, which is when SSTs drop below 18℃, Porites corals contract their tentacles (losing heterotrophic capability), then cease calcification (reducing energy consumption), and meanwhile maintain relatively high levels of zooxanthellae density (sustaining host's life via photosynthetic capacity of symbiotic zooxanthellae). This study revealed remarkable acclimatization of P. lutea corals to low temperature extremes. This acclimatization is beneficial for Porites corals in the NSCS to expand their living ranges towards the higher-latitude areas and have the potential to be the incipient reef former.
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