在高纬度地区扩展:北半球裸鳃珊瑚的进化、多样化和扩散。

IF 3.6 1区 生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecular Phylogenetics and Evolution Pub Date : 2024-10-04 DOI:10.1016/j.ympev.2024.108214
Irina A. Ekimova , Dimitry M. Schepetov , Brenna Green , Maria V. Stanovova , Tatiana I. Antokhina , Terrence Gosliner , Manuel Antonio E. Malaquias , Ángel Valdés
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引用次数: 0

摘要

裸鳃纲软体动物栉水母属(Coryphella)是分布广泛、物种丰富的腹足类动物,缺乏化石记录,在南半球和北半球都有复杂的分布。在本文中,我们详细回顾了栉水母的形态学、生态学和分布,估算了物种间的分化时间,重建了祖先区域,并对广泛分布的跨北极物种疣栉水母进行了种群分析,以研究其进化和系统地理学模式,并重建可能的大洋扩散历史路线。我们采用了更大的样本量和五种分子标记,揭示了 Coryphella 复杂的进化历史,其形成过程包括入侵、沧海桑田和饮食习惯的改变,总体上受到冰川周期的普遍影响。我们还发现了更多的隐性多样性,这表明进一步取样可能会在该裸鳃类群中发现更多的物种。树木校准表明,Coryphella 属起源于太平洋的中新世中期,该类的早期分化也发生在太平洋,特别是北太平洋的不同地区。祖先区域重建推断了五次独立的从太平洋经由不同迁移路线(包括巴拿马海道和白令海峡)到大西洋的跨越。其中,我们发现了三次从北太平洋经白令海峡成功过渡到北极水域的情况,这与中更新世的间冰期条件有关。因此,更新世的冰川周期很可能促使北方动物元素向南扩散,继而造成分布区的断裂和远距离种群的暂时隔离,并导致异地物种分化。当代跨北极物种种群结构的证据表明,在末次冰川极盛期之后,北极水域出现了来自南方和北方避难地的独立再殖民途径。
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Scaling the high latitudes: evolution, diversification, and dispersal of Coryphella nudibranchs across the Northern Hemisphere
Nudibranch molluscs Coryphella are widely distributed and species-rich gastropod group lacking fossil record and displaying a complex distribution across both Southern and Northern hemispheres. In this paper we provide a detailed review of the morphology, ecology, and distribution of Coryphella, estimation of divergence times between species, an ancestral area reconstruction, and a population analysis of widely distributed trans-Arctic species Coryphella verrucosa to investigate the evolution, phylogeographic patterns and reconstruct possible historical routes of oceanic dispersal. The inclusion of a larger sample size and five molecular markers has revealed a complex evolutionary history of Coryphella, shaped by transgression, vicariance, and dietary shifts, and overall driven by the pervasive effect of glacial cycles. We also revealed the presence of additional cryptic diversity, which suggests that further sampling may produce additional species in this group of nudibranchs. Tree calibration indicates the genus Coryphella originates in the middle Miocene in the Pacific Ocean and the early divergence within this group also occurred in the Pacific, specifically in different regions of the North Pacific. The ancestral area reconstruction inferred five independent instances of transgression from the Pacific Ocean to the Atlantic via different migration routes, including the Panamanian seaway and the Bering Strait. Among them, we identified three cases of successful transition to the Arctic waters from the North Pacific via the Bering Strait, associated with interglacial conditions of middle Pleistocene. Consequently, Pleistocene glacial cycles likely prompted pulses of boreal faunal elements to disperse southwards followed by range disjunction and temporary isolation of distant populations and resulting in allopatric speciation. Evidence from the population structure of contemporary trans-Arctic species suggests an occurrence of independent recolonization pathways of Arctic waters from both southernly and northernly refugia after the Last Glacial Maximum.
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来源期刊
Molecular Phylogenetics and Evolution
Molecular Phylogenetics and Evolution 生物-进化生物学
CiteScore
7.50
自引率
7.30%
发文量
249
审稿时长
7.5 months
期刊介绍: Molecular Phylogenetics and Evolution is dedicated to bringing Darwin''s dream within grasp - to "have fairly true genealogical trees of each great kingdom of Nature." The journal provides a forum for molecular studies that advance our understanding of phylogeny and evolution, further the development of phylogenetically more accurate taxonomic classifications, and ultimately bring a unified classification for all the ramifying lines of life. Phylogeographic studies will be considered for publication if they offer EXCEPTIONAL theoretical or empirical advances.
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