Symbiotic algae in two scleractinian corals: molecular phylogeny and their response to elevated temperatures

DONG Zhi-jun; HUANG Hui; HUANG Liang-min; LI Yuan-chao; SHI Xiang

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Article Navigation > Haiyang Xuebao > 2009 > 31(4): 141-148

DONG Zhi-jun, HUANG Hui, HUANG Liang-min, LI Yuan-chao, SHI Xiang. Symbiotic algae in two scleractinian corals: molecular phylogeny and their response to elevated temperatures[J]. Haiyang Xuebao, 2009, 31(4): 141-148.

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Symbiotic algae in two scleractinian corals: molecular phylogeny and their response to elevated temperatures

1.
Key Laboratory of Marine Bioresourses Sustainable Utilization, South China Sea Institute of Oceanlogy, Chinese Academy of Science, Guangzhou 510301, China;Yantai Institute of Coastal Zone Research for Sustainable Development, Chinese Academy of Sciences, Yantai 264003, China
2.
Key Laboratory of Marine Bioresourses Sustainable Utilization, South China Sea Institute of Oceanlogy, Chinese Academy of Science, Guangzhou 510301, China

Received Date: 2008-07-30
Rev Recd Date: 2009-01-16

Abstract

Abstract

Coral bleaching was one of the most important causes of decline of coral reef ecosystem globally.Field investigations on mass bleaching events have showed variation in bleaching susceptibility among different coral species.Comparisons were made for thermal stress suscepbility of symbiotic algae in two scleractinian corals Acropora millepora and Galaxea fascicularis.Present study demonstrated that the symbiotic algae in the two scleract inian corals belonged to two clades of the genus Symbiodinium.The scleractinian coral Galaxea fascicularis harbored Symbiodinium clade D,while the scleractinian coral A cropora millepora harbored Symbiodinium subclade C1.No marked reduction in phot ochemical efficiency(F_v/F_m) of photosystem Ⅱ(PSⅡ) was observed in two clades of the genus Symbiodinium while exposed to 30℃ condition However,when it clined to 34℃ significant reduction in photochemical efficiency(F_v/F_m) of PSⅡ occurred in two clades of the genus Symbiodinium.This research indicated that the differences in as sociation with distinct symbiotic algaes were the major causes behind coral bleaching sensit ivities for the two scleractinian coral A cropora millepora and Galaxea fascicularis.The scleractinian coral A cropora millepora associating with Symbiodinium subclade C1 is more sensitive to coral bleaching compared with coral Galaxea fascicularis associating with Sym biodinium Dunder high thermal stress.
- Coral bleaching,
- scleractinian coral,
- zooxanthellae,
- symbiotic algae

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References(30)

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