William C. Anderson, Erik R. Funk, Angela N. Theodosopoulos, Kathryn C. Grabenstein, Garth Spellman, Scott A. Taylor
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引用次数: 0
Abstract
Cryptic genetic differentiation is being increasingly documented in birds and other organisms using genome-wide variation. A recent example of cryptic genetic differentiation in a widespread species with conserved morphology is the northern house wren Troglodytes aedon. We found that, despite extremely similar morphology and no documented vocal differences, the two subspecies of the northern house wren, T. a. aedon (eastern) and T. a. parkmanii (western), exhibited both nuclear and mitochondrial genomic differentiation. Individuals present along the Front Range of the Colorado Rocky Mountains possessed nuclear genetic variation intermediate between T. a. aedon and T. a. parkmanii; additionally, both divergent mitochondrial lineages, corresponding to the western and eastern northern house wren populations, occur in Colorado. However, the dynamics of this putative contact zone (i.e. amount of hybridization or introgression) and the degree of differentiation between the two subspecies remain uncharacterized. To expand our understanding of northern house wren population genetic differentiation and explore the possibility of hybridization, we used a double digest restriction-site associated (ddRAD) approach and sequenced 127 northern house wrens, including 109 individuals from across Colorado and Wyoming, as well as nine individuals each from eastern and western allopatric regions. Our results highlight that T. a. aedon occur significantly further west than previously thought, and provide evidence for weak population structure within the northern house wren, while generally setting the stage for future investigations of northern house wren population genomics and the genetic basis of cryptic speciation.
利用全基因组变异,鸟类和其他生物的隐性遗传分化越来越多地被记录下来。一个最近的例子,在一个广泛的物种与保守形态的隐遗传分化是北方家鹪鹩Troglodytes aedon。我们发现,尽管形态极其相似,没有记录的声音差异,但北方鹪鹩的两个亚种,东部的T. a. aedon和西部的T. a. parkmanii,都表现出核和线粒体基因组分化。存在于科罗拉多落基山脉前沿山脉的个体具有介于T. a. aedon和T. a. parkmanii之间的核遗传变异;此外,两种不同的线粒体谱系,对应于西部和东部北部的鹪鹩种群,都出现在科罗拉多州。然而,这个假定的接触区(即杂交或渐渗的数量)的动态和两个亚种之间的分化程度仍未得到表征。为了扩大我们对北方鹪鹩种群遗传分化的认识并探索杂交的可能性,我们采用双消化限制性位点关联(ddRAD)方法对127只北方鹪鹩进行了测序,其中包括来自科罗拉多州和怀俄明州的109只,以及来自东部和西部异域地区的9只。我们的研究结果强调了aedon T. a.发生在比以前认为的更西部的地方,并为北方鹪鹩种群结构薄弱提供了证据,同时为未来研究北方鹪鹩种群基因组学和隐种形成的遗传基础奠定了基础。
期刊介绍:
Journal of Avian Biology publishes empirical and theoretical research in all areas of ornithology, with an emphasis on behavioural ecology, evolution and conservation.