中国沙鲑(Salmo caspius Kessler)种群恢复活动的分子遗传学分析。

IF 1.7 3区 农林科学 Q2 FISHERIES
Arezo Najafikhah, Omid Jafari, Maryam Nasrolahpourmoghadam, Mehrshad Zeinalabedini
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引用次数: 0

摘要

保持鱼苗的遗传多样性对鱼种放养和水产养殖活动非常重要。里海南部盆地的原生物种 Salmo caspius 是一个具有重要商业价值的物种,但野生种群的体型正在严重缩小。重新放养一直是保护里海鲑的主要方法;然而,目前还没有数据说明放养活动对野生种群产生的影响是积极的还是消极的。在这项研究中,我们采用了 28 个多态性简单序列重复序列(SSRs)来评估里海盆地南部放养中心里海鲶(n = 67)的遗传种群结构。结果显示遗传多样性水平很高(平均Ho = 0.88),没有近亲繁殖的迹象。结构分析确认了野生个体(CP);然而,在孵化场原生种群中观察到了严重的混杂结构,这可能是由于放养活动中的杂交事件造成的。种群间杂交会降低不同种群间的分化水平(总体 Fst = 0.01),导致未来种群崩溃。因此,强烈建议在恢复自然栖息地的同时,预先利用通过遗传数据获得的亲缘关系信息,以改善里海南部 S. caspius 的遗传健康状况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Molecular genetic assessments of the ongoing restocking activities on Salmo caspius Kessler, 1877.

Maintenance of genetic diversity in broodstocks is highly important for restocking and aquaculture activities. Salmo caspius, a native species in the southern basin of the Caspian Sea, is a commercially important species, yet wild populations of S. caspius are experiencing severe reduction in size. Restocking has been the main conservation approach for S. caspius; however, there are no data describing whether stocking activities are having a positive or negative impact on the wild populations. In this study, we employed 28 polymorphic simple sequence repeats (SSRs) to assess the genetic population structure of S. caspius (n = 67) in the restocking centre of southern Caspian basin. Results showed a high level of genetic diversity (mean Ho = 0.88) with no signatures of inbreeding. Structural analyses recognized the wild individuals (CP); however, a severe admixture structure for the hatchery-originated populations was observed, which can be due to the interbreeding events during restocking activity. Inter-population crosses would have diminished the level of differentiation among different populations (overall Fst = 0.01), resulting in a population collapse in the future. Therefore, pre-use of kinship information obtained through genetic data accompanied by rehabilitation of natural habitats is highly suggested to amend the genetic health of S. caspius in the southern Caspian Sea.

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来源期刊
Journal of fish biology
Journal of fish biology 生物-海洋与淡水生物学
CiteScore
4.00
自引率
10.00%
发文量
292
审稿时长
3 months
期刊介绍: The Journal of Fish Biology is a leading international journal for scientists engaged in all aspects of fishes and fisheries research, both fresh water and marine. The journal publishes high-quality papers relevant to the central theme of fish biology and aims to bring together under one cover an overall picture of the research in progress and to provide international communication among researchers in many disciplines with a common interest in the biology of fish.
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