Cryptic species in the cosmopolitan Bugula neritina complex (Bryozoa, Cheilostomata)
Cryptic species in the cosmopolitan Bugula neritina complex (Bryozoa, Cheilostomata)
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DOI：
10.1111/zsc.12042
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发表时间：
2014-03-01
影响因子：
2.5
通讯作者：
Waeschenbach, Andrea
中科院分区：
文献类型：
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作者：
Fehlauer-Ale, Karin H.;Mackie, Joshua A.;Waeschenbach, Andrea
先前对线粒体基因细胞色素c氧化酶亚基1 （COI）和-蛋白质细菌内共生生物多样性的分析表明，海洋苔藓虫Bugula neritina是三种隐种的复合体，即S型，D型和N型。D型和N型分别在美国西部的加利福尼亚州和美国东部的特拉华州和康涅狄格州有限制分布，而S型被认为广泛分布于热带地区。由于人为运输的亚热带和温带地区。本文通过对由两个线粒体（COI和大核糖体RNA亚基[16S]）和两个核基因（动力蛋白轻链路障2型蛋白[DYN]和电压依赖性阴离子选择通道蛋白[VDAC]）组成的数据集进行贝叶斯物种划分分析，发现S型、D型和N型分别对应三个生物物种。尽管对祖先种群大小和根龄进行了先验组合，但这一发现得到了显著支持。此外，利用COI序列分析了广域S型物种的引进模式。在全球范围内发现了2个S型COI单倍型（S1a和S1d）。Mantel试验表明，这些单倍型与当地海水表面温度耐受性之间存在相关性。因此，S型单倍型的分布除了反映了引种载体的作用外，还可能反映了种内耐温性的变化。最后，我们表明N型也可能被广泛引入，因为该物种首次在加利福尼亚中部和澳大利亚东北部被发现。
Previous analyses of the mitochondrial gene cytochrome c oxidase subunit 1 (COI) and -proteobacterial endosymbiont diversity have suggested that the marine bryozoan Bugula neritina is a complex of three cryptic species, namely Types S, D and N. Types D and N were previously reported to have restricted distributions along California (western USA) and Delaware and Connecticut (eastern USA), respectively, whereas Type S is considered widespread in tropical, subtropical and temperate regions due to anthropogenic transport. Here, Bayesian species delimitation analysis of a data set composed of two mitochondrial (COI and large ribosomal RNA subunit [16S]) and two nuclear genes (dynein light chain roadblock type-2 protein [DYN] and voltage-dependent anion-selective channel protein [VDAC]) demonstrated that Types S, D and N correspond to three biological species. This finding was significantly supported, in spite of the combinations of priors applied for ancestral population size and root age. Furthermore, COI sequences were used to assess the introduction patterns of the cosmopolitan Type S species. Two COI haplotypes of Type S (S1a and S1d) were found occurring at a global scale. Mantel tests showed correlation between these haplotypes and local sea surface temperature tolerance. Accordingly, the distributions of Type S haplotypes may reflect intraspecific temperature tolerance variation, in addition to the role of introduction vectors. Finally, we show that the Type N may also have been introduced widely, as this species was found for the first time in Central California and north-eastern Australia.