Karn Imwattana, Blanka Aguero, Marta Nieto-Lugilde, Aaron Duffy, Juan Jaramillo-Chico, Kristian Hassel, Olga Afonina, Paul Lamkowski, A. Jonathan Shaw
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In this paper, we (1) inferred the phylogeny of subg. <i>Acutifolia</i> and (2) investigated patterns of population structure and genetic diversity among five circumboreal species within the <i>S. capillifolium</i> complex.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>We generated RAD sequencing data from most species of the subg. <i>Acutifolia</i> and samples from across the distribution ranges of circumboreal species within the <i>S. capillifolium</i> complex.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>We resolved at least 14 phylogenetic clusters within the <i>S. capillifolium</i> complex. Five circumboreal species show some common patterns: One population system comprises plants in eastern North America and Europe, and another comprises plants in the Pacific Northwest or around the Beringian and Arctic regions. Alaska appears to be a hotspot for genetic admixture, genetic diversity, and sometimes endemic subclades.</p>\n </section>\n \n <section>\n \n <h3> Conclusions</h3>\n \n <p>Our results support the hypothesis that populations of five circumboreal species within the <i>S. capillifolium</i> complex survived in multiple refugia during the last glacial maximum. Long-distance dispersal out of refugia, population bottlenecks, and possible adaptations to conditions unique to each refugium could have contributed to current geographic patterns. 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引用次数: 0
摘要
前提：相关物种之间种群遗传变异的共同地理模式是确定驱动物种多样化的历史事件的有力手段。Sphagnum capillifolium复合体是Sphagnum亚属Acutifolia中一组亲缘关系密切的泥炭藓，包含几个环游物种，其分布范围涵盖北半球的冰川和非冰川地区。在本文中，我们（1）推断了 Acutifolia 亚属的系统发育，（2）研究了 capillifolium 群中五个环生物种的种群结构和遗传多样性模式：方法：我们从 Acutifolia 亚种的大多数物种以及霞糠穗草 S. capillifolium 复合体中的环生物种的分布范围内采集了 RAD 测序数据：结果：我们在 S. capillifolium 复合体中解析了至少 14 个系统发生群。五个环生物种显示出一些共同的模式：一个种群系统包括北美东部和欧洲的植物，另一个种群系统包括太平洋西北部或白令海和北极地区周围的植物。阿拉斯加似乎是遗传混合、遗传多样性的热点地区，有时还具有地方性亚支系：我们的研究结果支持这样的假设，即在上一个冰川极盛时期，霞糠穗草复合体中的五个环周物种的种群在多个避难所生存。从缓冲地带向外的长距离扩散、种群瓶颈以及对每个缓冲地带独特条件的可能适应，都可能促成了目前的地理格局。这些结果表明，历史事件在形成分布范围广泛的植物的复杂种群结构方面发挥着重要作用。
Parallel patterns of genetic diversity and structure in circumboreal species of the Sphagnum capillifolium complex
Premise
Shared geographical patterns of population genetic variation among related species is a powerful means to identify the historical events that drive diversification. The Sphagnum capillifolium complex is a group of closely related peat mosses within the Sphagnum subgenus Acutifolia and contains several circumboreal species whose ranges encompass both glaciated and unglaciated regions across the northern hemisphere. In this paper, we (1) inferred the phylogeny of subg. Acutifolia and (2) investigated patterns of population structure and genetic diversity among five circumboreal species within the S. capillifolium complex.
Methods
We generated RAD sequencing data from most species of the subg. Acutifolia and samples from across the distribution ranges of circumboreal species within the S. capillifolium complex.
Results
We resolved at least 14 phylogenetic clusters within the S. capillifolium complex. Five circumboreal species show some common patterns: One population system comprises plants in eastern North America and Europe, and another comprises plants in the Pacific Northwest or around the Beringian and Arctic regions. Alaska appears to be a hotspot for genetic admixture, genetic diversity, and sometimes endemic subclades.
Conclusions
Our results support the hypothesis that populations of five circumboreal species within the S. capillifolium complex survived in multiple refugia during the last glacial maximum. Long-distance dispersal out of refugia, population bottlenecks, and possible adaptations to conditions unique to each refugium could have contributed to current geographic patterns. These results indicate the important role of historical events in shaping the complex population structure of plants with broad distribution ranges.
期刊介绍：
The American Journal of Botany (AJB), the flagship journal of the Botanical Society of America (BSA), publishes peer-reviewed, innovative, significant research of interest to a wide audience of plant scientists in all areas of plant biology (structure, function, development, diversity, genetics, evolution, systematics), all levels of organization (molecular to ecosystem), and all plant groups and allied organisms (cyanobacteria, algae, fungi, and lichens). AJB requires authors to frame their research questions and discuss their results in terms of major questions of plant biology. In general, papers that are too narrowly focused, purely descriptive, natural history, broad surveys, or that contain only preliminary data will not be considered.
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