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DNA barcoding reveals the temporal community composition of drifting fish eggs in the lower Hongshui River, China

文献类型： 外文期刊

作者： Chen, Weitao 1 ; Zhu, Shuli 1 ; Yang, Jiping 2 ; Li, Xinhui 1 ; Li, Yuefei 1 ; Li, Jie 1 ;

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

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

3.Guangzhou Sci Observing & Expt Stn Natl Fisheries, Guangzhou, Peoples R China

4.Expt Stn Sci Observat Fishery Resources & Environ, Zhaoqing, Peoples R China

关键词： DNA barcodes; fish eggs; lower Hongshuihe River; spawning periods; species composition

期刊名称：ECOLOGY AND EVOLUTION （ 影响因子：2.881； 五年影响因子：3.252 ）

ISSN： 2045-7758

年卷期： 2021 年 11 卷 16 期

页码：

收录情况： SCI

摘要： Determining the temporal community composition of fish eggs in particular regions and understanding the reproductive times of regional fish taxa are key aspects of the management and regulation of regional fish stocks. However, it is extremely difficult to accurately identify fish eggs due to the absence of diagnostic morphological characters. We sampled fish eggs in the lower Hongshuihe River (an upper mainstem of the Pearl River) between May and September 2020. We then used DNA barcoding to determine the species composition of the egg pool and to predict the spawning periods of the identified species. A total of 641 eggs and 17 larvae were chosen for molecular identification; 397 eggs and 17 larvae yielded high-quality barcoding sequences. The high failure rate (similar to 38%) was most likely due to long-term storage in low concentrations of ethanol prior to molecular analysis. We successfully classified 392 eggs into 10 species and 13 larvae into four species using public databases. Most of the species identified in the egg pool were small and/or benthic, and migratory species were rare. This may partially reflect the adverse effects of hydropower cascade development in this river section. We also found that spawning periods tended to be species-specific. Our study provides a reference for the conservation and management of regional fishery stocks.

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