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The geochemical and biological study of corals
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Biogeography of coral endosymbionts in the genus Symbiodinium in the South China Sea and its adaptive potential to climate change
P-G3-01-S
Chen Biao* , 1.Coral Reef Research Center of China, Guangxi University, Nanning 530004, China
2.Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Nanning 530004, China
3.School of Marine Sciences, Guangxi University, Nanning 530004, China
Yu Kefu, 1.Coral Reef Research Center of China, Guangxi University, Nanning 530004, China
2.Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Nanning 530004, China
3.School of Marine Sciences, Guangxi University, Nanning 530004, ChinaSecond author and corresponding author
Liang jiayuan, 1.Coral Reef Research Center of China, Guangxi University, Nanning 530004, China
2.Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Nanning 530004, China
3.School of Marine Sciences, Guangxi University, Nanning 530004, China
Presenter Email: 475496334@qq.com |
| Coral reef ecosystem is under serious threat due to global climate change, so both the potential adaptability of coral-algal symbiosis and its impact factors need to be evaluated in more regions. The development of next-generation sequencing (NGS) technology provides us with an effective way to study the combined characteristics and ecological functions of symbionts in corals. Therefore, NGS was used to analyze the Symbiodinium rRNA internal transcribed spacer 2 (ITS2) marker genes from 88 reef-building coral samples (five genera) in four biogeography coral habitats across ~15゜ of latitudes from the South China Sea (SCS), which located on the northern edge of the "coral triangle" The results showed that a symbiosis between abundant types of Symbiodinium (8 clades and 216 subclades) and scleractinian was found, in which clade C and D are dominant types of symbiont. Thus, the high diversity of Symbiodinium provides more options for coral-algal symbiosis to respond to climate change. PERMANOVA analysis suggested that there are significant differences among the Symbiodinium community composition in four latitude areas, due to the influence of environmental factors, especially the temperature. The major components of whole Symbiodinium communites are subclade C1 in high latitude areas, subclade Cspc, C50 and D1 in intermediate latitude area, and C3u in low latitude areas. It indicated that a variety of combinations of symbionts at different latitude sites will result in functional diversity in the Symbiodinium community, which has a positive effect on coral-algal in response to climate change. Phylogenetic analysis showed that the symbionts of clade C have closer phylogenetic relationships so that they have similar environmental adaptability, but it is not stable because it is affected by different evolution flora, ancestors and potential recent invasion of symbionts. The invasion is probably the result of human transportation activities The analysis of rare symbionts (relative abundance less than 5%) revealed that their ability to establish symbiosis with different coral genus, their adaptability to a wide range of changing environment, and their widespread distribution in the SCS have increased the flexibility of coral-algal symbiosis to respond to climate change. In addition, the discovery of new symbiosis, clade H and clade I, which had symbiosis with scleractinian, has raised our awareness of the flexibility of coral-algal symbiosis. |
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