生物多样性

• • 上一篇    下一篇

基于线粒体COI基因的黄河流域麦穗鱼种群遗传多样性与群体结构

周智成1, 曹天玲1, 刘如垚1, 丁琪琪1, 马轲1, 杨丽萍1, 周传江2, 聂国兴1, 汤永涛1*   

  1. 1. 河南师范大学水产学院, 河南新乡 453007; 2. 河南师范大学生命科学学院, 河南新乡 453007
  • 收稿日期:2024-11-18 修回日期:2025-04-10 接受日期:2025-09-11
  • 通讯作者: 汤永涛

Genetic diversity and population structure of Pseudorasbora parva in the Yellow River based on the mitochondrial COI gene

Zhicheng Zhou1, Tianling Cao1, Ruyao Liu1, Qiqi Ding1, Ke Ma1, Liping Yang1, Chuanjiang Zhou2, Guoxing Nie1, Yongtao Tang1   

  1. 1 College of Fisheries, Henan Normal University, Xinxiang, Henan 453007, China 

    2 College of Life Sciences, Henan Normal University, Xinxiang, Henan 453007, China

  • Received:2024-11-18 Revised:2025-04-10 Accepted:2025-09-11
  • Contact: Yongtao Tang

摘要: 近年来, 受人类活动的影响, 黄河正面临着水土流失、水体污染以及河道生境破碎化等诸多问题。在此背景下, 黄河流域鱼类等水生生物的遗传多样性是否受到影响值得深入探讨。本研究采集了黄河流域15个样点的麦穗鱼样品, 并对其线粒体COI基因进行测序。结果显示, 153条COI基因序列中共检测出34个变异位点, 定义27个单倍型(Hap 1–27)。遗传多样性分析结果显示, 黄河麦穗鱼的单倍型多样性和核苷酸多样性分别为h = 0.802 ± 0.030、π = 0.00508 ± 0.00035。与其他水系相比, 黄河麦穗鱼遗传多样性略低于海河水系, 但高于长江、珠江等南方水系。在评估黄河麦穗鱼种群遗传分化水平时, AMOVA分析显示, 黄河麦穗鱼种群遗传变异主要来自于种群内(86.38%), 组内(0.11%)和组内种群间(13.51%)的遗传变异贡献相对有限; 种群遗传距离和Mantel检验结果也表明, 黄河流域麦穗鱼种群间的遗传距离整体偏小且种群遗传距离与地理距离之间没有显著相关性。上述结果综合表明, 黄河麦穗鱼种群间尚未形成明显的遗传分化, 河道大坝对麦穗鱼种群起到的隔离作用有限。在探讨海东地区麦穗鱼入侵种群的潜在来源时, 多种分析结果对其来源的指向并不一致, 结合青海省过去的水产引种历史, 我们推测海东地区的麦穗鱼种群可能经历过多次引种且引种来源地并不唯一。贝叶斯天际线图(Bayesian skyline plot, BSP)结果显示, 在0.005–0 Ma期间, 黄河流域麦穗鱼有效种群规模逐渐缩小。该时期人类农业与工业快速发展所引发的水体污染及栖息地退化等环境问题, 可能是麦穗鱼种群下降的主要原因。

关键词: 黄河, 麦穗鱼, COI, 遗传多样性, 种群历史动态

Abstract

Aims: The Yellow River has played a crucial role in the development of Chinese civilization. However, it is now facing severe environmental challenges due to human activities, including erosion, water pollution, and the fragmentation of aquatic habitats. Under these circumstances, it is essential to investigate whether the aquatic organisms, particularly fish species, in the Yellow River basin have been affected. This study aimed to assess the genetic diversity and population structure of Pseudorasbora parva in the Yellow River. 

Methods: In this study, we collected 153 individuals of P. parva from 15 sites across the Yellow River and sequenced their mitochondrial COI gene. Additional COI sequences from other river systems, including the Yangtze River, Pearl River, and Nujiang River, were retrieved from GenBank for comparison. Haplotype composition, haplotype diversity (h), nucleotide diversity (π), and the average number of nucleotide differences (k) were calculated. To evaluate population structure, we conducted an analysis of molecular variance (AMOVA) by grouping Yellow River populations into upper, middle and lower reaches based on their geographical locations. Furthermore, we also performed Mantel tests, phylogenetic analyses, and Bayesian skyline plot (BSP) modeling to examine genetic differentiation and demographic history. 

Results: A total of 34 polymorphic loci and 27 haplotypes were identified among the Yellow River populations. 8 haplotypes were shared with other river systems. The haplotype and nucleotide diversity of P. parva in the Yellow River were relatively high (h = 0.802 ± 0.030; π = 0.00508 ± 0.00035), suggesting a historically stable population. AMOVA results indicated that most genetic differentiation existed within populations (86.38%), with limited variation among groups (0.11%) and among populations within groups (13.51%). Genetic distances among Yellow River populations ranged from 0.000596 to 0.009539. The Mantel test revealed no significant correlation between genetic distance and geographic distance. Phylogenetic trees and haplotype networks indicated no clear geographic structure, and neutrality tests and mismatch distributions suggested no recent population expansion. BSP analysis showed that the P. parva population experienced a slow increase from 0.175–0.005 Ma, followed by a decline to the present. 

Conclusion: The P. parva populations from the Yellow River exhibited relatively high genetic diversity without significant genetic differentiation, indicating ongoing gene flow. While dam construction may pose barriers to dispersal, human-mediated activities such as aquatic trade and species introduction have likely mitigated the effects of isolation. However, population declines observed in recent history may be attributed to environmental degradation and water pollution. These findings highlight the need for enhanced conservation and ecological monitoring in the Yellow River basin.

Key words: Yellow River, Pseudorasbora parva, COI, genetic diversity, population demography