高海拔针叶树种--亚高山落叶松的全域遗传结构

IF 3.4 2区 环境科学与生态学 Q2 ECOLOGY
Marie Vance, Jean Richardson, Barbara Hawkins, Patrick von Aderkas
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引用次数: 0

摘要

目的亚高山落叶松是一种寿命较长的针叶树,在北美西部山区的高山上分布有限。气候变化正在减少这种栖息地的可用性,而亚高山落叶松不太可能适应不断变化的环境,因为它的世代时间较长,常存遗传变异水平相对较低,而且整个物种分布区的栖息地高度破碎化。本研究旨在阐明亚高山落叶松的遗传结构,为未来的保护和管理工作提供信息。方法从整个物种分布区的高海拔种群中采集组织。利用限制性位点相关 DNA 测序生成单核苷酸多态性 (SNP) 数据。结果利用 751 个中性 SNPs 进行聚类分析,确定了三个基因分化区域:喀斯特山脉、落基山脉南部和落基山脉北部。AMOVA证实了各地区之间存在明显的遗传差异。主成分的判别分析和 Provesti 遗传距离的树枝图都支持这样的假设,即遗传上不同的品系是从单一的更新世避难所扩散后产生的。显著的距离隔离(IBD)支持了扩散在塑造现代亚高山落叶松遗传变异模式中的关键作用。在未来的管理中应优先考虑这三个地区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Range‐Wide Genetic Structure of a High‐Elevation Conifer Species, Subalpine Larch
AimSubalpine larch is a long‐lived conifer with a restricted distribution at treeline in the mountains of western North America. Climate change is reducing the availability of this habitat and subalpine larch is unlikely to adapt to its changing environment due to its long generation time, relatively low levels of standing genetic variation and the high degree of habitat fragmentation across the species' range. This study seeks to elucidate the genetic structure of subalpine larch to inform future conservation and management efforts.LocationWestern North America.TaxonSubalpine larch (Larix lyallii Parl.).MethodsTissue was collected from high‐elevation populations across the entire species range. Restriction site associated DNA sequencing was used to generate single nucleotide polymorphism (SNP) data. Population genetic analyses identified genetic differentiation.ResultsClustering analyses performed using 751 neutral SNPs identified three genetically differentiated regions: the Cascade Range, the southern Rocky Mountains and the northern Rocky Mountains. AMOVA confirmed significant genetic differentiation among regions. A discriminant analysis of principal components and a dendrogram of Provesti's genetic distance both supported the hypothesis that genetically distinct lineages arose after dispersal from a single Pleistocene refugium. Significant isolation by distance (IBD) supported the key role of dispersal in shaping modern patterns of genetic variation in subalpine larch.Main ConclusionsPost‐Pleistocene dispersal resulted in genetic differentiation among groups of subalpine larch in the Cascade Range, the southern Rocky Mountains and the northern Rocky Mountains. These three regions should be prioritised for future management.
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来源期刊
Journal of Biogeography
Journal of Biogeography 环境科学-生态学
CiteScore
7.70
自引率
5.10%
发文量
203
审稿时长
2.2 months
期刊介绍: Papers dealing with all aspects of spatial, ecological and historical biogeography are considered for publication in Journal of Biogeography. The mission of the journal is to contribute to the growth and societal relevance of the discipline of biogeography through its role in the dissemination of biogeographical research.
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