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首页> 外文期刊>Marine biology >Stable populations in unstable habitats: temporal genetic structure of the introduced ascidian Styela plicata in North Carolina
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Stable populations in unstable habitats: temporal genetic structure of the introduced ascidian Styela plicata in North Carolina

机译：不稳定栖息地中的稳定种群：北卡罗来纳州引进的海生Styela plicata的时间遗传结构

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摘要

The analysis of temporal genetic variability is an essential yet largely neglected tool to unveil and predict the dynamics of introduced species. We here describe the temporal genetic structure and diversity over time of an introduced population of the ascidian Styela plicata (Lesueur, 1823) in Wilmington (North Carolina, USA, 34 08/24"N, 77 5144"W). This population suffers important salinity and temperature changes, and in June every year we observed massive die -offs, leaving free substratum that was recolonized within a month. We sampled 12-14 individuals of S. plicata every 2 months from 2007 to 2009 (N = 196) and analyzed a mitochondrial marker (the gene cytochrome oxidase subunit I, COI) and seven nuclear microsatellites. Population genetic analyses showed similar results for both types of markers and revealed that most of the genetic variation was found within time periods. However, analyses conducted with microsatellite loci also showed weak but significant differences among time periods. Specifically, in the samplings after die-off episodes (August November 2007 and 2008) the genetic diversity increased, the inbreeding coefficient showed prominent drops, and there was a net gain of alleles in the microsatellite loci. Taken together, our results suggest that recruits arriving from neighboring populations quickly occupied the newly available space, bringing new alleles with them. However, other shifts in genetic diversity and allele loss and gain episodes were observed in December January and February March 2008, respectively, and were apparently independent of die-off events. Overall, our results indicate that the investigated population is stable over time and relies on a periodic arrival of larvae from other populations, maintaining high genetic diversity and a complex interplay of allele gains and losses.
机译：时间遗传变异性的分析是揭示和预测引入物种动态的必不可少的工具，但在很大程度上被忽视。我们在这里描述了威尔明顿市（美国北卡罗来纳州，美国，34 08/24“ N，77 5144” W）的海生Styela plicata（Lesueur，1823）引入种群的时间遗传结构和多样性。这个人口遭受着重要的盐度和温度变化的影响，每年的六月，我们观察到大量的死亡，留下了在一个月内重新定殖的自由基质。我们从2007年到2009年每2个月对12.-14例链球菌进行采样（N = 196），并分析了线粒体标记（基因细胞色素氧化酶亚基I，COI）和七个核微卫星。群体遗传分析显示两种标记物的结果相似，并且揭示了大多数遗传变异是在一定时期内发现的。但是，使用微卫星基因座进行的分析也显示出各个时间段之间存在微弱但显着的差异。具体来说，在死亡后（2007年11月和2008年8月）的采样中，遗传多样性增加，近交系数显示出显着下降，并且微卫星基因座中有等位基因净增加。综上所述，我们的结果表明，来自邻近人群的新兵很快占据了新的可用空间，并带来了新的等位基因。但是，分别在2008年1月和2008年3月观察到了遗传多样性和等位基因损失及获得事件的其他变化，并且这些变化显然与死亡事件无关。总体而言，我们的结果表明，所调查的种群随着时间的推移是稳定的，并且依赖于其他种群的幼虫的周期性到达，从而保持了高遗传多样性以及等位基因得失的复杂相互作用。

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    《Marine biology》 |2016年第3期|59.1-59.14|共14页
  • 作者

    Carmen Pineda M.; Turon Xavier; Perez-Portela Rocio; Lopez-Legentil Susanna;

  • 作者单位

    Univ Barcelona, Dept Anim Biol Invertebrates, Diagonal Ave 643, E-08028 Barcelona, Spain|Australian Inst Marine Sci, PMB3, Townsville Mail Ctr, Qld 4810, Australia;

    CSIC, CEAB, Ctr Adv Studies Blanes, Acces Cala S Francesc 14, Blanes 17300, Girona, Spain;

    CSIC, CEAB, Ctr Adv Studies Blanes, Acces Cala S Francesc 14, Blanes 17300, Girona, Spain|Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA;

    Univ N Carolina, Dept Biol & Marine Biol, 5600 Marvin K Moss Lane, Wilmington, NC 28401 USA|Univ N Carolina, Ctr Marine Sci, 5600 Marvin K Moss Lane, Wilmington, NC 28401 USA;

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