Species delimitation and historical biogeography of Sturisoma Swainson, 1838 (Loricariidae: Loricariinae): Hidden diversity along the Amazon River

IF 3.6 1区生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY

Molecular Phylogenetics and Evolution Pub Date : 2024-11-26 DOI:10.1016/j.ympev.2024.108248

Alejandro Londoño-Burbano, Marcelo R. Britto

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引用次数: 0

Abstract

In the present study, we used DNA sequences from three mitochondrial (COI, Cytb, and nd2) and one nuclear (RAG2) marker, to perform species delimitation analyses (ABGD, GMYC, BPP, and bPTP) within Sturisoma to test the validity of currently recognized and potential new species for the genus. Additionally, a historical biogeographic analysis was carried out to test the age and centers of origin for species of the genus. Results found here indicate a high degree of genetic divergence with overlapping morphological characteristics suggesting a greater diversity than previously proposed for the genus. All valid species currently included in Sturisoma were confirmed here, and one potentially undescribed species was recovered. Based on genetic distances, geographical patterns and historical biogeography, the diversification of the group could be related to dispersal events from Western to Eastern Amazonia resulting in sympatric species that are highly divergent genetically but conservative morphologically. The lower (eastern) Amazonas and the Orinoco River basins were identified as the main centers of origin for the genus, with an approximate age of origin of 13 Mya, during the Miocene. The diversity of the genus is likely to be even higher because the Amazon River is a hotspot of hidden biodiversity.

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Sturisoma Swainson, 1838（食蚁兽科：食蚁兽属）的物种划分和历史生物地理学：亚马逊河沿岸的隐藏多样性。

在本研究中，我们使用了三个线粒体（COI、Cytb 和 nd2）和一个核（RAG2）标记的 DNA 序列，在 Sturisoma 中进行了物种划界分析（ABGD、GMYC、BPP 和 bPTP），以检验该属目前公认的和潜在的新物种的有效性。此外，还进行了历史生物地理学分析，以检验该属物种的年龄和起源中心。研究结果表明，该属物种的遗传分化程度很高，形态特征相互重叠，这表明该属物种的多样性比之前提出的更高。目前 Sturisoma 属中的所有有效物种都在此得到了确认，同时还发现了一个可能未被描述的物种。根据遗传距离、地理模式和历史生物地理学，该物种群的多样化可能与从亚马孙西部向东亚马孙东部的扩散事件有关，从而产生了遗传上高度不同但形态上保守的同域物种。亚马孙河下游（东部）和奥里诺科河流域被确定为该属的主要起源中心，起源年龄约为 13 Mya，即中新世时期。由于亚马逊河是一个隐藏生物多样性的热点地区，因此该属的多样性可能更高。

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来源期刊

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.