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DNA Barcode Reference Library and Undetected Diversity of Fish Species in the Yuanjiang River, China

文献类型： 外文期刊

作者： Shi, Xian 1 ; Kou, Chunni 1 ; He, Chengdong 1 ; Deng, Hong 1 ; Yang, Hongfu 4 ; Li, Xinhui 1 ; Liu, Mingdian 5 ; Liu, Yaqiu 1 ; Li, Jie 1 ; Chen, Weitao 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Guangzhou 510380, Peoples R China

2.Fujian Agr & Forestry Univ, Ocean Coll, Fuzhou 350002, Peoples R China

3.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai, Peoples R China

4.Fisheries Adm Qiubei, Wenshan 663220, Peoples R China

5.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan 430223, Peoples R China

6.Key Lab Aquat Anim Immune Technol Guangdong Prov, Guangzhou 510380, Peoples R China

7.Natl Fisheries Resources & Environm, Guangzhou Sci Observing & Expt Stn, Guangzhou 510380, Peoples R China

关键词： Yuanjiang River; DNA barcoding; fish species; species delimitation; cryptic diversity

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 8 期

页码：

收录情况： SCI

摘要： The Yuanjiang River, situated in the upper reaches of the Red River, is a crucial component of a biodiversity hotspot in the mountains of southwestern China, supporting a high diversity of fish species. Nevertheless, systematic research on fish diversity in the Yuanjiang River is scarce, scattered, and outdated. In our study, we produced 764 DNA barcodes belonging to 64 fish morphospecies to evaluate fish diversity in the Yuanjiang River. Barcoding gap analysis and DNA-based delimitation approaches achieved a high identification success rate (>93%), indicating that DNA barcoding is a practical approach for delimiting fish in the Yuanjiang River. However, four species were characterized by high levels of intraspecific divergence, generating multiple clades and/or molecular operational taxonomic units (MOTUs), suggesting that these species might comprise undetected species. Meanwhile, two closely related species within the genus Schistura, i.e., S. callichroma and S. caudofurca, cannot be delimited by the DNA barcoding technique, which is indicative of recent speciation. In summary, this study established a reliable DNA barcode reference library for fish species in the Yuanjiang River and revealed previously unknown fish diversity.

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