Population genetic structure and demographic history reconstruction of introduced flathead catfish (Pylodictis olivaris) in two US Mid-Atlantic rivers

IF 2 3区 农林科学 Q2 FISHERIES
Justin M. Waraniak, Michael S. Eackles, Jason Keagy, Geoffrey D. Smith, Megan Schall, Sydney Stark, Shannon L. White, David C. Kazyak, Tyler Wagner
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Abstract

Population genetic analysis of invasive populations can provide valuable insights into the source of introductions, pathways for expansion, and their demographic histories. Flathead catfish (Pylodictis olivaris) are a prolific invasive species with high fecundity, long-distance dispersal, and piscivorous feeding habits that can lead to declines in native fish populations. In this study, we analyse the genetics of invasive P. olivaris in the Mid-Atlantic region to assess their connectivity and attempt to reconstruct the history of introduced populations. Based on an assessment across 13 microsatellite loci, P. olivaris from the Susquehanna River system (N = 537), Schuylkill River (N = 33), and Delaware River (N = 1) have low genetic diversity (global Hobs = 0.504), although we detected no evidence of substantial inbreeding (FIS = −0.083 to 0.022). P. olivaris from these different river systems were genetically distinct, suggesting separate introductions. However, population structure was much weaker within each river system and exhibited a pattern of high connectivity, with some evidence of isolation by distance. P. olivaris from the Susquehanna and Schuylkill rivers showed evidence for recent genetic bottlenecks, and demographic models were consistent with historical records, which suggest that populations were established by recent founder events consisting of a small number of individuals. Our results show the risk posed by small introductions of P. olivaris, which can spread widely once a population is established, and highlight the importance of prevention and sensitive early detection methods to prevent the spread of P. olivaris in the future.

Abstract Image

美国大西洋中部两条河流中引进的平头鲶(Pylodictis olivaris)的种群遗传结构和人口历史重建。
对入侵种群的种群遗传分析可以为了解入侵种群的来源、扩张途径及其人口历史提供宝贵的信息。平头鲶(Pylodictis olivaris)是一种多产的入侵物种,具有繁殖力强、远距离传播和食鱼的习性等特点,可导致本地鱼类种群数量下降。在这项研究中,我们分析了大西洋中部地区入侵橄榄鲤的遗传学,以评估它们之间的联系,并试图重建引入种群的历史。根据对 13 个微卫星位点的评估,来自 Susquehanna 河系统(N = 537)、Schuylkill 河(N = 33)和特拉华河(N = 1)的 P. olivaris 遗传多样性较低(全球 Hobs = 0.504),尽管我们没有发现大量近亲繁殖的证据(FIS = -0.083 至 0.022)。来自这些不同河流水系的 P. olivaris 在遗传上是不同的,这表明它们是分开引入的。然而,每个河流水系内的种群结构要弱得多,呈现出高度连通的模式,并有一些因距离而隔离的证据。来自 Susquehanna 河和斯库尔基尔河的 P. olivaris 有证据表明最近出现了遗传瓶颈,而且人口统计模型与历史记录一致,表明种群是由少数个体组成的近期始祖鸟事件建立的。我们的研究结果表明,小规模引入的橄榄蓟马会带来风险,一旦种群建立起来,就会广泛传播,这也凸显了预防和敏感的早期检测方法对于防止橄榄蓟马在未来传播的重要性。
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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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