Mitochondrial DNA reveals the impact of Pleistocene glaciations on a widespread palearctic bat species

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Jan Gojznikar, Frieder Mayer
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Abstract

Today’s biodiversity was strongly impacted by glacial cycles during the Pleistocene. They generated species diversity and population structuring, which can easily remain undetected, if populations differentiation is not accompanied by divergence in external morphological traits. This phenomenon, described as cryptic diversity, has been intensively researched in bats, which are known to harbour cryptic phylogenetic lineages. Many studies however have a regional focus or suffer from geographical gaps. Widely understudied areas include Central and Western Asia, although they connect the western and eastern Palearctic fauna. These areas are characterized by topographic heterogeneity and therefore high ecosystem diversity. In this study we investigated the phylogeography of the Savii’s pipistrelle (Hypsugo savii), a bat species assumed to be widely distributed across the Palaearctic. We compiled published sequences from four mitochondrial genes (ND1, CytB, COI and 16 S), added new sequences especially from the Asian part of the distribution range and performed phylogenetic and phylogeographic analyses. They indicate that H. savii is a taxonomic unit with extensive cryptic diversity, comprising at least four major mitochondrial lineages with allopatric or parapatric distribution ranges. Divergence time dating reveals the impact of Pleistocene glaciations on shaping highly structured populations of a highly mobile mammal across the Palearctic. Our study also revealed several zones of secondary contact among populations where hybridization and gene flow likely occur. This study highlights the necessity for studying biodiversity in Western and Central Asia in order to understand biogeographic patterns, evolutionary processes and conservation needs in the area that connects eastern and western Palearctic faunas.

Abstract Image

线粒体 DNA 揭示更新世冰川对一种广泛分布的古北蝙蝠的影响
今天的生物多样性受到更新世时期冰川周期的强烈影响。冰川周期产生了物种多样性和种群结构,如果种群分化没有伴随着外部形态特征的分化,这种多样性和种群结构很容易不被发现。这种现象被称为隐性多样性,在蝙蝠中得到了深入研究,众所周知,蝙蝠蕴藏着隐性系统发育系。然而,许多研究都以地区为重点,或存在地理空白。研究普遍不足的地区包括中亚和西亚,尽管这两个地区连接着古北动物群的西部和东部。这些地区具有地形异质性的特点,因此生态系统多样性较高。在这项研究中,我们调查了萨维琵琶蜥(Hypsugo savii)的系统地理学。我们汇编了已发表的四个线粒体基因(ND1、CytB、COI 和 16 S)的序列,特别添加了分布区亚洲部分的新序列,并进行了系统发育和系统地理学分析。研究结果表明,H. savii 是一个具有广泛隐性多样性的分类单元,至少包括四个主要线粒体系,分布范围为同域或近域。分异时间测定揭示了更新世冰川作用对这种高度流动的哺乳动物在整个古北区形成高度结构化种群的影响。我们的研究还揭示了多个种群间的次级接触区,在这些接触区很可能发生杂交和基因流动。这项研究强调了研究西亚和中亚生物多样性的必要性,以便了解连接东、西古北动物群的这一地区的生物地理格局、进化过程和保护需求。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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