Journal of Tropical Oceanography ›› 2020, Vol. 39 ›› Issue (4): 70-79.doi: 10.11978/2019102CSTR: 32234.14.2019102

• Marine Geology • Previous Articles     Next Articles

Coral reef growth of Weizhou Island and its response to climate change in the past millennium

Ting ZHANG1,2,3(), Minhang HU1,2, Wenjing ZHANG1,2,3, Tianran CHEN1,3(), Meng LIU4   

  1. 1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
  • Received:2019-10-16 Revised:2019-11-26 Online:2020-07-20 Published:2020-07-27
  • Contact: Tianran CHEN E-mail:zhangting173@mails.ucas.ac.cn;chentianran@scsio.ac.cn
  • Supported by:
    Foundation item: National Natural Science Foundation of China(41476038);Foundation item: National Natural Science Foundation of China(41676049);Natural Science Foundation of Guangdong Province(2018A030313142)

Abstract:

Whether high-latitude coral habitat could become “refuge” for tropical coral species under global warming is still unclear, and related research on the northern South China Sea is especially rare. Based on two reef cores drilled from Weizhou Island, the development history of coral reefs surrounding Weizhou Island and its response to climate change in the past millennium are explored with the help of U-Th dating technology, sedimentary component analyses and coral species identification. Three rapid accretion stages of Core1 (collected from Shiluokou) deposition roughly correspond to the Roman Warm Period, Medival Warm Period and Present Warm Period, respectively. And two slow accretion stages roughly correspond to the Dark Age Cold Period and Little Ice Age. They suggested that warm climate promotes reef development, while cold climate has adverse impacts on coral reef development. Strong local disturbances may have caused the rapid degradation of Weizhou Island coral reefs in recent decades. Core2 (collected in Southern Bay) has high terrigenous sediment content. U-Th ages in Core2 are concentrated in a relatively narrow time interval of 800AD—950AD and present, probably referred to environment changes, storms and the distribution of modern corals. By comparing the two sites on the same island, we further suggest the concepts of “Complete Refuge” and “Incomplete Refuge”, and reveal that Weizhou Island corals may have both developmental characteristics and trends of low-latitude tropical coral reefs and high-latitude coral communities.

Key words: high-latitude, coral reef development, climate change, classification of refuges, Weizhou Island

CLC Number: 

  • P736.2