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Regional genetic structure and genetic founder effects in the invasive lionfish: comparing the Gulf of Mexico, Caribbean and North Atlantic

机译：侵入性l鱼的区域遗传结构和遗传创始人效应：比较墨西哥湾，加勒比海和北大西洋

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摘要

Indo-Pacific lionfish (Pterois volitans and P. miles) recently invaded Western Atlantic waters, rapidly spreading through the Caribbean and Gulf of Mexico (GoM). Previous genetic analyses using the mitochondrial d-loop determined that populations in the Western North Atlantic (NA) region have up to nine haplotypes, whereas Caribbean populations contain four of the North Atlantic haplotypes. The genetic composition of GoM populations, reported here for the first time, could lend insight into the pathway of dispersal into the GoM and better understanding of the biogeography of this recent invader. Here, we determined the genetic composition of lionfish throughout the GoM and compared haplotype composition to Caribbean and North Atlantic regions. We found that GoM samples contained only three d-loop haplotypes that are common in the Caribbean and North Atlantic. The genetic structure differed significantly among the three regions (AMOVA: Phi(CT) = 0.062; p = 0.001), but we found no differences between locations within regions (AMOVA: Phi(SC) = 0.005; p = 0.092). The composition of GoM samples most closely matches the composition of Caribbean samples indicating that Caribbean populations are the likely source of the GoM populations. As each region was successively invaded, a drop in haplotype diversity and changes in haplotype frequencies occurred indicating dispersal limitation across basin boundaries and founder effects within each basin. The lack of differentiation within regions indicates rapid population growth and unfettered dispersal within basins after initial colonization. We find no evidence of secondary invasions within samples. With well-established populations, the probability of detecting a secondary invasion is minuscule.
机译：印度太平洋的ion鱼（Pterois volitans和P. miles）最近入侵了西大西洋水域，迅速扩散到加勒比海和墨西哥湾（GoM）。以前使用线粒体d环进行的遗传分析确定，北大西洋西部（NA）区域的种群具有多达9个单倍型，而加勒比海种群包含北大西洋的4个单倍型。 GoM种群的遗传组成首次在此报道，可能有助于深入了解GoM的传播途径，并更好地了解这一近期入侵者的生物地理。在这里，我们确定了整个GoM中of鱼的遗传组成，并将单体型组成与加勒比海和北大西洋地区进行了比较。我们发现GoM样本仅包含三种在加勒比海和北大西洋常见的d环单倍型。三个区域之间的遗传结构差异显着（AMOVA：Phi（CT）= 0.062； p = 0.001），但我们发现区域内位置之间没有差异（AMOVA：Phi（SC）= 0.005； p = 0.092）。 GoM样本的组成与加勒比样本的组成最接近，表明加勒比海人口是GoM人口的可能来源。随着每个区域的不断入侵，单倍型多样性下降，单倍型频率发生变化，这表明跨盆地边界的扩散限制和每个盆地内的奠基者效应。区域内缺乏分化表明最初定殖后盆地内人口快速增长，不受限制地扩散。我们发现样本中没有二次入侵的证据。对于建立良好的种群，发现二次入侵的可能性很小。

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  • 来源
    《Marine biology》 |2016年第10期|216.1-216.7|共7页
  • 作者

    Johnson John; Bird Christopher E.; Johnston Michelle A.; Fogg Alexander Q.; Hogan J. Derek;

  • 作者单位

    Texas A&M Univ, Dept Life Sci, 6300 Ocean Dr, Corpus Christi, TX 78412 USA;

    Texas A&M Univ, Dept Life Sci, 6300 Ocean Dr, Corpus Christi, TX 78412 USA;

    Flower Garden Banks Natl Marine Sanctuary, 4700 Ave U,Bldg 216, Galveston, TX 77550 USA;

    Univ Southern Mississippi, Gulf Coast Res Lab, Dept Coastal Sci, 703 East Beach Dr, Ocean Springs, MS 39564 USA|Florida Fish & Wildlife Conservat Commiss, 620 South Meridian St,Box 4B2, Tallahassee, FL 32399 USA;

    Texas A&M Univ, Dept Life Sci, 6300 Ocean Dr, Corpus Christi, TX 78412 USA;

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