Understudied regions and messy taxonomy: Geography, not taxonomy, is the best predictor for genetic divergence of the Poecilimon bosphoricus species group

IF 4.7 1区 农林科学 Q1 ENTOMOLOGY
Battal Çıplak, Özgül Yahyaoğlu, Onur Uluar, L. Lacey Knowles
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Abstract

The complex and dynamic history of the Anatolian Peninsula during the Pleistocene set the stage for species diversification. However, the evolutionary history of biodiversity in the region is shrouded by the challenges of studying species divergence in the recent, dynamic past. Here, we study the Poecilimon bosphoricus (PB) species group to understand how the bush crickets' diversification and the regions' complex history are coupled. Specifically, using sequences of two mitochondrial and two nuclear gene segments from over 500 individuals for a comprehensive set of taxa with extensive geographic sampling, we infer the phylogenetic and geographic setting of species divergence. In addition, we use the molecular data to examine hypothesized species boundaries that were defined morphologically. Our analyses of the timing of divergence confirm the recent origin of the PB complex, indicating its diversification coincided with the dynamic geology and climate of the Pleistocene. Moreover, the geography of divergence suggests a history of fragmentation followed by admixture of populations, suggestive of a ring species. However, the evolutionary history based on genetic divergence conflicts with morphologically defined species boundaries raising the prospects that incipient species divergences may be relatively ephemeral. As such, the morphological differences observed in the PB complex may not to be sufficient to have prevented homogenizing gene flow in the past. Alternatively, with the recent origin of the complex, the lack of time for lineage sorting may underlie the discord between morphological species boundaries and genetic differentiation. Under either hypothesis, geography—not taxonomy—is the best predictor of genetic divergence.

Abstract Image

Abstract Image

研究不足的地区和混乱的分类:地理而非分类学是预测 Poecilimon bosphoricus 物种群遗传分化的最佳指标
安纳托利亚半岛在更新世期间复杂多变的历史为物种多样化奠定了基础。然而,该地区生物多样性的进化史却被研究近代动态历史中物种分化的挑战所掩盖。在这里,我们研究了Poecilimon bosphoricus(PB)物种群,以了解丛林蟋蟀的物种多样化与该地区复杂的历史是如何结合在一起的。具体来说,我们利用来自 500 多个个体的两个线粒体基因片段和两个核基因片段的序列,通过广泛的地理取样,对物种分化的系统发育和地理环境进行了推断。此外,我们还利用分子数据研究了从形态学角度界定的假定物种边界。我们对物种分化时间的分析证实了 PB 复合体起源于近期,表明其分化与更新世的动态地质和气候相吻合。此外,分化的地理位置表明,其种群经历了先破碎后混杂的历史,这表明它是一个环状物种。然而,基于遗传分化的进化史与形态学上确定的物种边界相冲突,这就使得物种分化的萌芽可能相对短暂。因此,在 PB 复合体中观察到的形态差异可能不足以阻止过去的同源基因流动。或者,由于该复合体起源较晚,缺乏进行世系分类的时间,这可能是形态上的物种边界与遗传分化不一致的原因。无论是哪种假设,地理而非分类学都是预测基因分化的最佳指标。
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来源期刊
Systematic Entomology
Systematic Entomology 生物-进化生物学
CiteScore
10.50
自引率
8.30%
发文量
49
审稿时长
>12 weeks
期刊介绍: Systematic Entomology publishes original papers on insect systematics, phylogenetics and integrative taxonomy, with a preference for general interest papers of broad biological, evolutionary or zoogeographical relevance.
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