广泛分布但基因碎片化:伊比利亚蚱蜢更新世气候振荡的人口统计结果

IF 3.2 1区 农林科学 Q1 ENTOMOLOGY Insect Systematics and Diversity Pub Date : 2021-09-01 DOI:10.1093/isd/ixab009
J. Ortego, V. Noguerales, Vanina Tonzo, María José González‐Serna, P. J. Cordero
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引用次数: 6

摘要

虽然当代景观组成和范围变化驱动的更新世气候振荡的遗传后果已经在高山生物中得到了很好的研究,但我们对这些因素如何影响具有更广泛气候生态位和分布的分类群的人口统计知之甚少。本研究利用高通量测序数据研究了一种常见的伊比拉蝗虫Omocestus panteli (Bolívar, 1887)(直翅目:蝗科)基因组变异的空间格局,该蝗虫分布于多种栖息地类型和广泛的海拔范围(从海平面到bb0 2000 m)。尽管该物种分布广泛,但我们的分析支持其当代种群显示出可追溯到末次冰期的显著遗传碎片化。因此,对不同基因流动情景的空间明确测试和人口统计学推断分析表明,种群之间的遗传分化及其长期有效种群规模最好用末次冰期(约21 ka)环境适宜栖息地的空间配置来解释。当时,该物种经历了净人口扩张,但散布在不合适的地区可能破坏了基因流动,并为地理多样化创造了机会。总的来说,我们的分析表明,当代种群的遗传组成不能用当前的环境因素或地理障碍来很好地解释,而主要反映了末次冰期的遗传碎片化,随后是先前分离的基因库在冰期后的混合。综上所述,这些结果支持更新世“物种泵”模型可能也有助于解释以广泛气候生态位为特征的分类群的人口动态和地理多样化。
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Broadly Distributed but Genetically Fragmented: Demographic Consequences of Pleistocene Climatic Oscillations in a Common Iberian Grasshopper
Although the genetic consequences of contemporary landscape composition and range shifts driven Pleistocene climatic oscillations have been studied fairly well in alpine organisms, we know much less about how these factors have shaped the demography of taxa with broader climatic niches and distributions. Here, we use high-throughput sequencing data to study the processes underlying spatial patterns of genomic variation in Omocestus panteli (Bolívar, 1887) (Orthoptera: Acrididae), a common Iberian grasshopper distributed across numerous habitat types and a wide elevational range (from sea level to >2,000 m). Although the species is broadly distributed, our analyses support that its contemporary populations show significant genetic fragmentation that dates back to the last glacial period. Accordingly, spatially explicit testing of alternative gene flow scenarios and demographic inference analyses revealed that genetic differentiation between populations and their long-term effective population sizes are best explained by the spatial configuration of environmentally suitable habitats during the last glacial maximum (ca. 21 ka). At that time, the species experienced net demographic expansions but interspersed unsuitable areas might have disrupted gene flow and created opportunity for geographical diversification. Collectively, our analyses indicate that the genetic makeup of contemporary populations is not well explained by current environmental factors or geographical barriers to dispersal but mostly reflects genetic fragmentation during the last glacial period followed by postglacial admixture among previously isolated gene pools. Taken together, these results support that the Pleistocene ‘species pump’ model might be also useful in explaining demographic dynamics and geographical diversification in taxa characterized by broad climatic niches.
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来源期刊
CiteScore
5.30
自引率
8.80%
发文量
34
期刊最新文献
Reviewers for Insect Systematics and Diversity (November 2022–October 2023) Building a community-based taxonomic resource for digitization of parasites and their hosts Across mountains and ocean: species delimitation and historical connectivity in Holarctic and Arctic-Alpine wolf spiders (Lycosidae, Pardosa) Jumping to new hosts: the diversification of flea beetles (Coleoptera: Chrysomelidae: Alticini) in the context of their host plant associations Comparative anatomy of venom glands suggests a role of maternal secretions in gall induction by cynipid wasps (Hymenoptera: Cynipidae)
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