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深度遗传分化和极少的形态变化支持了来自南大西洋西部的短头拟牙䱛（拟牙䱛科，刺尾鱼目）的隐存物种形成。

Deep genetic divergences and few morphological changes support the cryptic speciation in Larimus breviceps (Sciaenidae, Acanthuriformes) from the western South Atlantic.

作者信息

Alencar Salene, Bentes Bianca, Sampaio Iracilda, Vallinoto Marcelo, da Silva Tarcia Fernanda, da Silva Ana Claudia Carvalho, Bessa-Silva Adam, Santos Simoni

机构信息

Laboratory of Fish Microbiology, Institute of Coastal Studies, Federal University of Para (UFPA), Alameda Leandro Ribeiro s/n, Braganca, 68600-000, Para, Brazil.

Núcleo de Ecologia Aquática e Pesca da Amazônia, Universidade Federal do Pará, Belém, Pará, Brazil.

出版信息

Sci Rep. 2024 Dec 28;14(1):31541. doi: 10.1038/s41598-024-83196-8.

DOI:10.1038/s41598-024-83196-8
PMID:39732967
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11682148/
Abstract

We evaluate the evidence of cryptic speciation in Larimus breviceps, a species widely distributed in the western South Atlantic, from the Greater Antilles to Santa Catarina in Brazil. Mitochondrial (COI, Cyt b, and Control Region) and nuclear (IGF1 and Tmo-4C4) sequences were obtained from populations in the western South Atlantic. The analysis revealed two genetically distinct, sympatric lineages with no gene flow, with L. breviceps lineage II (LII) being closer to Larimus pacificus than to the L. breviceps lineage I (LI). The most recent common ancestor (TMRCA) for the L. breviceps LI and L. pacificus/L. breviceps LII clade dates from 12.3 Ma, whereas TMRCA for the L. pacificus and L. breviceps LII dates from 3.4 Ma, indicating that speciation processes may be related to the rise of the Isthmus of Panama. Despite these profound genetic differences, morphometric analyses found only subtle differences between lineages, with specimens of the LI being slightly larger than those of the LII, suggesting the existence of cryptic species. Within each lineage there is a pattern of panmixia within the study area. Therefore, we suggest that it is necessary a taxonomic revision of Larimus from the western Atlantic to validate the species status of such lineages.

摘要

我们评估了短头拉氏鱼（Larimus breviceps）隐秘物种形成的证据，该物种广泛分布于南大西洋西部，从大安的列斯群岛到巴西的圣卡塔琳娜。从南大西洋西部的种群中获取了线粒体（COI、Cyt b和控制区）和核（IGF1和Tmo - 4C4）序列。分析揭示了两个遗传上不同的同域谱系，它们之间没有基因流动，短头拉氏鱼谱系II（LII）与太平洋拉氏鱼（Larimus pacificus）的亲缘关系比与短头拉氏鱼谱系I（LI）更近。短头拉氏鱼LI与太平洋拉氏鱼/短头拉氏鱼LII分支的最近共同祖先（TMRCA）可追溯到1230万年前，而太平洋拉氏鱼和短头拉氏鱼LII的TMRCA可追溯到340万年前，这表明物种形成过程可能与巴拿马地峡的隆起有关。尽管存在这些深刻的遗传差异，但形态测量分析发现谱系之间只有细微差异，LI的标本比LII的略大，这表明存在隐秘物种。在每个谱系内，研究区域内存在随机交配模式。因此，我们建议有必要对西大西洋的拉氏鱼进行分类修订，以验证这些谱系的物种地位。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/ee5476602bfe/41598_2024_83196_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/43c19754ccaa/41598_2024_83196_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/6b66b812fe88/41598_2024_83196_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/ee5476602bfe/41598_2024_83196_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/43c19754ccaa/41598_2024_83196_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/eb604876a1cb/41598_2024_83196_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/f70542be0e5a/41598_2024_83196_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/32a11e511dea/41598_2024_83196_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/f1b2619e349d/41598_2024_83196_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/6b66b812fe88/41598_2024_83196_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c92/11682148/ee5476602bfe/41598_2024_83196_Fig8_HTML.jpg

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