Phylogenetic relationship within Cumacea (Crustacea: Peracarida) and genetic variability of two Antarctic species of the family Leuconidae

IF 0.8 4区 生物学 Q4 MARINE & FRESHWATER BIOLOGY Scientia Marina Pub Date : 2020-12-11 DOI:10.3989/scimar.05053.17a
P. Rehm, S. Thatje, F. Leese, C. Held
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引用次数: 3

Abstract

Phylogenetic hypotheses for the peracarid order Cumacea are scarce and have not provided a solution to the full extent. In the present study, a fragment of the mitochondrial 16S rDNA was used to erect a phylogenetic hypothesis for three cumacean families, Diastylidae, Bodotriidae and Leuconidae, along with intra-family relationships of the latter. The Cumacea resolved monophyletic with tanaids and isopods as outgroup taxa. The Diastylidae were the only family with good support for monophyly. The genus Leucon resolved paraphyletic, whereas the subgenus Crymoleucon was monophyletic. Furthermore, the genetic structure was analysed for two leuconid species, Leucon antarcticus Zimmer, 1907 and L. intermedius Mühlenhardt-Siegel, 1996, from the Weddell Sea and the Ross Sea. The two species showed different patterns of intraspecific genetic variability. In contrast to L. intermedius, a bimodal distribution of pairwise genetic distances was observed for L. antarcticus, which is correlated with geographical and depth distributions between the Ross Sea and the Weddell Sea. Although a clear evaluation of cryptic speciation in these species requires additional work on more specimens from more geographic regions and broader depth ranges, differences shown in the sequences of 16S rDNA can only be explained by genetic separation of populations between the Weddell Sea and the Ross Sea for an extended period of time.
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Cumacacea的系统发育关系(甲壳纲:Peracarida)和两个南极白锥虫科物种的遗传变异
过硬目Cumacea的系统发育假说很少,也没有提供一个完整的解决方案。本研究利用线粒体16S rDNA片段,建立了三个cumacean科(Diastylidae, Bodotriidae和Leuconidae)的系统发育假说,以及后者的家族内关系。Cumacea是单系的,以单足类和等足类为外群。唯一具有较好单系性支持的科是双翅亚科。Leucon属分解为单系,而Crymoleucon亚属分解为单系。此外,我们还分析了威德尔海和罗斯海的两个白鱼种Leucon antarcticus Zimmer(1907)和L. intermedius m hlenhardt- siegel(1996)的遗传结构。这两个物种表现出不同的种内遗传变异模式。与中间乳杆菌相反,南极乳杆菌的双遗传距离呈双峰分布,与罗斯海和威德尔海之间的地理和深度分布有关。虽然对这些物种的隐种形成进行明确的评估需要对更多地理区域和更广泛深度范围的更多标本进行额外的工作,但16S rDNA序列所显示的差异只能用威德尔海和罗斯海之间长时间种群的遗传分离来解释。
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来源期刊
Scientia Marina
Scientia Marina 生物-海洋与淡水生物学
CiteScore
2.10
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Scientia Marina is the successor to Investigación Pesquera, a journal of marine sciences published since 1955 by the Institut de Ciències del Mar de Barcelona (CSIC). Scientia Marina is included in the Science Citation Index since 1998 and publishes original papers, reviews and comments concerning research in the following fields: Marine Biology and Ecology, Fisheries and Fisheries Ecology, Systematics, Faunistics and Marine Biogeography, Physical Oceanography, Chemical Oceanography, and Marine Geology. Emphasis is placed on articles of an interdisciplinary nature and of general interest.
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