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首页> 外文期刊>Marine biology >Evolutionary history of the calcareous sponge Clathrina aurea: genetic connectivity in the Western Atlantic and intriguing occurrence in the Eastern Pacific
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Evolutionary history of the calcareous sponge Clathrina aurea: genetic connectivity in the Western Atlantic and intriguing occurrence in the Eastern Pacific

机译：钙质海绵的进化历史克拉纳·艾，：东太平洋西部大西洋地区的遗传连通性

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摘要

Clathrina aurea was considered endemic to Brazil before being recorded from the Pacific (Peru) and the Caribbean Sea. We assessed the morphological variability, phylogeographic pattern and population genetic structure of the species across its geographic range to understand how habitat fragmentation/reduction can affect a widely distributed species with supposedly low dispersal capability. Samples from 15 localities in the Caribbean Sea (n=8), Brazil (n=5), and Peru (n=2) were studied. Morphological analyses included characterisation of external morphology, skeleton composition, and spicules morphometry. Phylogenetic trees and haplotype network were constructed using rDNA sequences. Population structure was assessed using microsatellite loci (F-ST fixation index and Discriminant Analysis of Principal Components). Morphological traits were consistent with C. aurea, although certain differences have been found, possibly due to environmental factors (temperature and pH). Phylogenetic analyses corroborated the conspecificity of the individuals and indicated higher genetic variability in individuals from Brazil and Caribbean, compared to Peru. Phylogeographic analyses indicated that Brazil had the oldest population of C. aurea, suggesting the expansion of this species across the Amazon River to the Caribbean and its connectivity through intermediate populations (e.g., Abrolhos). Population structure analyses also revealed high levels of genetic connectivity between the Caribbean and Northeast Brazil and among Southeast Brazilian localities. All analyses indicated isolation or restricted gene flow between Pacific and Atlantic populations. This, combined with the reduced genetic diversity in Peru and the supposedly limited larval dispersal capability, suggest a possible non-natural dispersion; however, we cannot exclude other hypotheses.
机译：在从太平洋（秘鲁）和加勒比海记录之前，Clathrina Aurea被认为是巴西的地方性。我们对其地理范围的物种的形态变异，神话模式和群体遗传结构评估了栖息地破碎/减少如何影响具有据说低分散能力的广泛分布的物种。研究了来自15个地区（n = 8），巴西（n = 5）和秘鲁（n = 2）的样品。形态学分析包括外部形态，骨架组合物和穗形态学的表征。使用RDNA序列构建系统发育树和单倍型网络。使用微卫星基因座（F-ST固定指标和主成分的判别分析）评估人口结构。形态学性质与C.Aurea一致，尽管已经发现了某些差异，可能是由于环境因素（温度和pH）。与秘鲁相比，系统发育分析证实了众年人的内心特征，并表明了巴西和加勒比人的遗传变异。 Phylogeography分析表明，巴西患有最古老的C. Aurea，这表明通过中间人群（例如，Abrolhos）来扩大亚马逊河流的这种物种及其连通性。人口结构分析还揭示了加勒比海和东北巴西和巴西东南部地区之间的高水平遗传连通性。所有分析都指出了太平洋和大西洋群体之间的分离或限制基因流动。这将与秘鲁的遗传多样性降低和据说有限的幼虫分散能力相结合，表明了可能的非自然分散;但是，我们不能排除其他假设。

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  • 来源
    《Marine biology》 |2021年第8期|127.1-127.23|共23页
  • 作者

    Condor-Lujan Baslavi; Leocorny Pedro; Padua Andre; Azevedo Fernanda; Seixas Victor Correa; Hooker Yuri; Hajdu Eduardo; Willenz Philippe; Perez Thierry; Klautau Michelle;

  • 作者单位

    Univ Fed Rio De Janeiro Inst Biol Dept Zool Av Carlos Chagas Filho 373 BR-21941902 Rio De Janeiro RJ Brazil|Univ Cient Sur Fac Ciencias Vet & Biol Carrera Biol Marina Antigua Panamer Km 19 Lima Peru;

    Univ Fed Rio De Janeiro Inst Biol Dept Zool Av Carlos Chagas Filho 373 BR-21941902 Rio De Janeiro RJ Brazil|Univ Fed Rio De Janeiro Inst Biodiversidade & Sustentabilidade Av Sao Jose Barreto 764 BR-27965045 Rio De Janeiro RJ Brazil;

    Univ Fed Rio De Janeiro Inst Biol Dept Zool Av Carlos Chagas Filho 373 BR-21941902 Rio De Janeiro RJ Brazil|Univ Fed Rural Rio de Janeiro Inst Ciencias Biol & Saude Dept Biol Anim BR 465 Km 7 BR-23897000 Seropedica RJ Brazil;

    Univ Fed Rio De Janeiro Inst Biol Dept Zool Av Carlos Chagas Filho 373 BR-21941902 Rio De Janeiro RJ Brazil;

    Univ Fed Rio de Janeiro Inst Biol Programa Posgrad Ecol Av Carlos Chagas Filho 373 BR-21941902 Rio De Janeiro RJ Brazil|Univ Fed Fluminense Inst Biol Dept Biol Marinha Rua Prof Marcos Waldemar Freitas Reis Bloco M Sao BR-24210201 Niteroi RJ Brazil;

    Univ Peruana Cayetano Heredia Lab Biol Marina Av Honorio Delgado 430 Urb Ingn San Martin Porre Lima Peru;

    Univ Fed Rio De Janeiro Dept Invertebrados Museu Nacl Quinta Boa Vista S-N BR-20940040 Rio De Janeiro RJ Brazil;

    Royal Belgian Inst Nat Sci Taxon & Phylogeny Rue Vautier 29 B-1000 Brussels Belgium|Univ Libre Bruxelles Lab Biol Marine Ave FD Roosevelt 50 B-1050 Brussels Belgium;

    Aix Marseille Univ CNRS Inst Mediterraneen Biodiversite & Ecol Marine Avignon Univ Stn Marine Endoume Rue Batterie Lion F-13007 Marseille France;

    Univ Fed Rio De Janeiro Inst Biol Dept Zool Av Carlos Chagas Filho 373 BR-21941902 Rio De Janeiro RJ Brazil;

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