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Promoting larval settlement of coral Pocillopora damicornis by calcium |
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| Authors: | Yang Qingsong Zhang Wenqian Zhang Ying Tang Xiaoyu Ling Juan Zhang Yanying Dong Junde |
| Affiliation: | 1.CAS Key Laboratory of Tropical Marine Bio-Resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China ;2.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China ;3.Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences and Hainan Key Laboratory of Tropical Marine Biotechnology, Sanya, 572000, China ;4.Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301, China ;5.University of Chinese Academy of Sciences, Beijing, 100049, China ;6.Ocean School, Yantai University, Yantai, 264005, China ; |
| Abstract: | Larval settlement is a critical bottleneck in the process of coral sexual propagation. Promoting coral larval settlement by inducers is a promising strategy in coral reef restoration engineering. In this study, the settlement-promoting effect of Ca2+ on larvae of the brooding coral Pocillopora damicornis was investigated for the first time. Treatment with 40 mM CaCl2 for 24 h effectively promoted coral larval settlement (~ 80%). Moreover, CaCl2 is comparable with the natural inducer, crustose coralline algae (CCA), in both promoting coral larval settlement and post-settlement growth. CaCl2 showed toxic effects on larval survival and growth at high concentrations, and this could be minimized by optimizing CaCl2 concentration and shortening the exposure period. Our study suggests that applying Ca2+ to effectively and efficiently induce coral larval settlement is viable for laboratory research and small-scale aquaculture systems, and it might become a useful tool in future coral reef restoration engineering. |
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