Study on the population distribution of <i>Acanthaster planci</i> in the reef area of the Xisha Islands based on environmental DNA technology

Yan Zhicong; Xing Jiajie; Cai Wenqi; Zhang Kaidian; Wu Zhongjie; Li Yuanchao; Tang Jia; Zhou Zhi

doi:10.12284/hyxb2023038

Volume 45 Issue 3

Feb. 2023

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Yan Zhicong，Xing Jiajie，Cai Wenqi, et al. Study on the population distribution of Acanthaster planci in the reef area of the Xisha Islands based on environmental DNA technology[J]. Haiyang Xuebao，2023, 45(3)：76–83 doi: 10.12284/hyxb2023038

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Yan Zhicong，Xing Jiajie，Cai Wenqi, et al. Study on the population distribution of Acanthaster planci in the reef area of the Xisha Islands based on environmental DNA technology[J]. Haiyang Xuebao，2023, 45(3)：76–83 doi: 10.12284/hyxb2023038

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Study on the population distribution of Acanthaster planci in the reef area of the Xisha Islands based on environmental DNA technology

doi: 10.12284/hyxb2023038

Yan Zhicong^1
,,
Xing Jiajie¹,
Cai Wenqi^{1, 2},
Zhang Kaidian¹,
Wu Zhongjie^{2
,
,},
Li Yuanchao²,
Tang Jia¹,
Zhou Zhi^{1
,
,}

1.
College of Marine Sciences, Hainan University, Haikou 570228, China
2.
Hainan Academy of Ocean and Fisheries Sciences, Haikou 571126, China

Received Date: 2022-04-10
Rev Recd Date: 2022-10-12

Available Online: 2022-10-21

Publish Date: 2023-02-01

Abstract

Abstract

Acanthaster planci, one of the predators of reef-building corals, has attracted much attention for its catastrophic damage to coral reef ecosystems. However, the spatial and temporal distribution characteristics of A. planci are still unclear in the coral reef ecosystem of the South China Sea. In this study, using environmental DNA and real-time quantitative PCR techniques, we analyzed the concentration variation of the mitochondrial cytochrome-c-oxidase subunits I (COTS-mtCOI) fragment of A. planci in the surface seawater of the Xisha Islands in September 2020, April 2021 and January 2022, and the correlations between the concentration variation with environmental factors such as seawater temperature, salinity, pH, chlorophyll content, nutrients content and other environmental factors. The results showed that COTS-mtCOI fragment concentration in the Xisha Islands varied from 0 copies/m³ to 4.13×10⁷ copies/m³ during 2020−2022, and there were always higher concentrations in the Yongle Atoll. For Huaguang Reef, Jinqing Islands, Lingyang Reef, Quanfu Island and Zhaoshu Island, the average concentration of COTS-mtCOI fragment in September 2020 was significantly (p<0.05) higher than those in April 2021 and January 2022. In addition, COTS-mtCOI fragment concentration was significantly (p<0.05) positively correlated with surface seawater temperature. These results suggest that the population of A. planci is widely distributed in the seawater of Xisha Islands, and higher density of A. planci could appear in Yongle Atoll. Moreover, ocean warming may accelerate the outbreak of A. planci. This study is helpful to understand the population distribution characteristics of A. planci in the coral reef ecosystems of the South China Sea, and can provide a theoretical basis for the early warning and forecast of the A. planci outbreak.
- coral reef,
- Acanthaster planci,
- environmental DNA,
- seawater temperature

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References(30)

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