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Using multiple natural tags provides evidence for extensive larval dispersal across space and through time in summer flounder.
Molecular Ecology ( IF 4.9 ) Pub Date : 2020-04-13 , DOI: 10.1111/mec.15414
Jennifer A Hoey 1 , F Joel Fodrie 2 , Quentin A Walker 3, 4 , Eric J Hilton 5 , G Todd Kellison 6 , Timothy E Targett 7 , J Christopher Taylor 3 , Kenneth W Able 8 , Malin L Pinsky 1
Affiliation  

Dispersal sets the fundamental scales of ecological and evolutionary dynamics and has important implications for population persistence. Patterns of marine dispersal remain poorly understood, partly because dispersal may vary through time and often homogenizes allele frequencies. However, combining multiple types of natural tags can provide more precise dispersal estimates, and biological collections can help to reconstruct dispersal patterns through time. We used single nucleotide polymorphism genotypes and otolith core microchemistry from archived collections of larval summer flounder (Paralichthys dentatus, n = 411) captured between 1989 and 2012 at five locations along the US East coast to reconstruct dispersal patterns through time. Neither genotypes nor otolith microchemistry alone were sufficient to identify the source of larval fish. However, microchemistry identified clusters of larvae (n = 3-33 larvae per cluster) that originated in the same location, and genetic assignment of clusters could be made with substantially more confidence. We found that most larvae probably originated near a biogeographical break (Cape Hatteras) and that larvae were transported in both directions across this break. Larval sources did not shift north through time, despite the northward shift of adult populations in recent decades. Our novel approach demonstrates that summer flounder dispersal is widespread throughout their range, on both intra- and intergenerational timescales, and may be a particularly important process for synchronizing population dynamics and maintaining genetic diversity during an era of rapid environmental change. Broadly, our results reveal the value of archived collections and of combining multiple natural tags to understand the magnitude and directionality of dispersal in species with extensive gene flow.

中文翻译:

使用多个天然标签为证据表明,在夏季比目鱼中,整个空间和整个时间都有大量幼虫扩散。

分散确定了生态和进化动力学的基本尺度,对人口的持久性具有重要意义。海洋散布的模式仍然知之甚少,部分原因是散布可能随时间变化,并且经常使等位基因频率均匀。但是,将多种类型的自然标签组合在一起可以提供更精确的分散估计,而生物学收集可以帮助重建随时间变化的分散模式。我们使用了1989年至2012年之间在美国东海岸五个地点捕获的幼体夏季比目鱼(Paralichthys dentatus,n = 411)的存档集合中的单核苷酸多态性基因型和耳石核心微化学,以重建随时间变化的扩散模式。基因型和耳石微化学都不足以鉴定幼鱼的来源。然而,微化学鉴定出了起源于相同位置的幼虫簇(每簇n = 3-33个幼虫),并且可以更加自信地进行簇的遗传分配。我们发现,大多数幼虫可能起源于生物地理断裂附近(哈特拉斯角),并且幼虫在该断裂的两个方向上均被运输。尽管近几十年来成年人口向北移动,但幼虫的来源并未随时间向北移动。我们的新方法表明,夏季比目鱼的扩散在代际和代际时间尺度上都遍及它们的整个范围,并且在环境快速变化的时代,这可能是同步种群动态和维持遗传多样性的一个特别重要的过程。宽广地,
更新日期:2020-04-13
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