文献类型： 外文期刊
作者： Zhao, Jinfa 1 ; Lin, Lin 2 ; Liu, Yong 2 ; Wang, Teng 2 ; Liu, Yu 2 ; Xiao, Yayuan 2 ; Shen, Jianzhong 1 ; Xie, Hongyu 1 ; Huang, Hai 4 ; Han, Qiuying 4 ;
作者机构： 1.Huazhong Agr Univ, Coll Fisheries, Wuhan 430070, Peoples R China
2.Chinese Acad Fishery Sci, Guangdong Prov Key Lab Fishery Ecol & Environm, Key Lab South China Sea Fishery Resources Exploita, South China Sea Fisheries Res Inst,Minist Agr & R, Guangzhou 510300, Peoples R China
3.Sanya Trop Fisheries Res Inst, Sci Observat & Res Stn Xisha Isl Reef Fishery Ecos, Sanya 572018, Peoples R China
4.Hainan Trop Ocean Univ, Yazhou Bay Innovat Inst, Key Lab Utilizat & Conservat Trop Marine Bioresour, Minist Educ, Sanya 572018, Peoples R China
关键词： coral reef fish; eDNA; Xisha Islands; biological diversity; spatial distribution
期刊名称：FISHES （ 影响因子：2.4； 五年影响因子：2.4 ）
ISSN：
年卷期： 2025 年 10 卷 5 期
页码：
收录情况： SCI
摘要： Global coral reef ecosystems face various levels of disturbance pressure. Understanding the depth-structured variation in coral reef fish communities can help us to better grasp and predict the adaptive changes of the ecosystem under different stressors. This study applied eDNA metabarcoding technology to analyze the spatial distribution of the coral reef fish at various depths (0 m, 5 m, 10 m, 15 m, 20 m, 30 m, 40 m, 50 m, and 60 m) within the Xisha Islands of China. The results indicated that the eDNA technology detected a total of 213 amplicon sequence variants (ASVs), including 33 species that were not identified using traditional methods. Herbivorous fish generally dominated in relative abundance across different depths. Moreover, the similarity among depth groups was largely absent, and significant differences existed in fish assemblages across depth gradients, consistent with the unique depth preferences of fish microhabitats. Importantly, our findings revealed distinct depth-structured variation among different functional groups of coral reef fish. Large carnivorous fish initially increased and then decreased along the depth gradient from 0 to 60 m, with a turning point around 20 m, while large herbivorous fish displayed the opposite trend. Small carnivorous and small herbivorous fish consistently declined along the same depth gradient. Additionally, the Margalef index (D) and Function richness (FRic) both displayed a consistent downward trend with increasing depth, while the Shannon-Wiener index (H '), Pielou index (J '), Quadratic entropy (RaoQ), Functional dispersion (FDis), and Functional evenness (FEve) initially increased and then decreased, peaking around 20 m. This study revealed that eDNA metabarcoding is an effective tool for evaluating coral reef fish biodiversity, community composition, and spatial distribution. It enhances our understanding of distribution dynamics and offers valuable insights for coral reef conservation and restoration efforts.
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