北美西部爬行动物多样化的重复模式得到了北方鳄蜥(Elgaria coerulea)的支持。

IF 3 2区 生物学 Q2 EVOLUTIONARY BIOLOGY Journal of Heredity Pub Date : 2024-02-03 DOI:10.1093/jhered/esad073
Adam D Leaché, Hayden R Davis, Chris R Feldman, Matthew K Fujita, Sonal Singhal
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引用次数: 0

摘要

了解通过促进或阻止种群分化形成遗传多样性的过程,有助于确定促进或限制基因流动的地理区域。此外,广泛分布的物种使我们能够理解生物地理和生态地理转变如何影响基因流动。我们利用北方短吻鳄蜥蜴(Elgaria coerulea)的基因组数据研究了这些过程,这种蜥蜴广泛分布在北美西部不同的生态区域(加利福尼亚植物区和太平洋西北地区)和山脉(内华达山脉、沿海山脉和喀斯喀特山脉)。本研究收集了120份蓝棘豆样本的单核苷酸多态性(SNP)数据。对分布相似的有鳞爬行动物的生物地理分析已经确定了几种共同的多样化模式,这些模式为蓝棘龙提供了可测试的预测,包括内华达山脉的深层遗传分化,南部种群的人口稳定性,以及最近更新世后向太平洋西北地区的扩张。我们使用基因组数据通过估计种群的结构、连通性和系统发育历史来测试这些预测。至少有10个不同的种群被支持,混合血统的个体位于大多数种群边界。物种树分析为内华达山脉种群的早期分化和最近向太平洋西北地区的多样化提供了强有力的支持。混合和迁移分析发现了下喀斯喀特和北加州种群之间的基因流动,基因流动的空间分析发现了内华达山脉和海岸山脉之间基因流动的重大障碍。蓝棘遗传多样性在种群边界上的分布是不均匀的、斑驳的和相互联系的。蓝棘的生物地理格局与共分布物种的预测一致。
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Repeated patterns of reptile diversification in Western North America supported by the Northern Alligator Lizard (Elgaria coerulea).

Understanding the processes that shape genetic diversity by either promoting or preventing population divergence can help identify geographic areas that either facilitate or limit gene flow. Furthermore, broadly distributed species allow us to understand how biogeographic and ecogeographic transitions affect gene flow. We investigated these processes using genomic data in the Northern Alligator Lizard (Elgaria coerulea), which is widely distributed in Western North America across diverse ecoregions (California Floristic Province and Pacific Northwest) and mountain ranges (Sierra Nevada, Coastal Ranges, and Cascades). We collected single-nucleotide polymorphism data from 120 samples of E. coerulea. Biogeographic analyses of squamate reptiles with similar distributions have identified several shared diversification patterns that provide testable predictions for E. coerulea, including deep genetic divisions in the Sierra Nevada, demographic stability of southern populations, and recent post-Pleistocene expansion into the Pacific Northwest. We use genomic data to test these predictions by estimating the structure, connectivity, and phylogenetic history of populations. At least 10 distinct populations are supported, with mixed-ancestry individuals situated at most population boundaries. A species tree analysis provides strong support for the early divergence of populations in the Sierra Nevada Mountains and recent diversification into the Pacific Northwest. Admixture and migration analyses detect gene flow among populations in the Lower Cascades and Northern California, and a spatial analysis of gene flow identified significant barriers to gene flow across both the Sierra Nevada and Coast Ranges. The distribution of genetic diversity in E. coerulea is uneven, patchy, and interconnected at population boundaries. The biogeographic patterns seen in E. coerulea are consistent with predictions from co-distributed species.

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来源期刊
Journal of Heredity
Journal of Heredity 生物-遗传学
CiteScore
5.20
自引率
6.50%
发文量
63
审稿时长
6-12 weeks
期刊介绍: Over the last 100 years, the Journal of Heredity has established and maintained a tradition of scholarly excellence in the publication of genetics research. Virtually every major figure in the field has contributed to the journal. Established in 1903, Journal of Heredity covers organismal genetics across a wide range of disciplines and taxa. Articles include such rapidly advancing fields as conservation genetics of endangered species, population structure and phylogeography, molecular evolution and speciation, molecular genetics of disease resistance in plants and animals, genetic biodiversity and relevant computer programs.
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