Insights into the diversification of deep-sea endoparasites: Phylogenetic relationships within Dendrogaster (Crustacea: Ascothoracida) and a new species description from a western Pacific seamount

IF 2.3 3区 地球科学 Q2 OCEANOGRAPHY
Naoto Jimi , Itaru Kobayashi , Takeya Moritaki , Sau Pinn Woo , Shinji Tsuchida , Yoshihiro Fujiwara
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引用次数: 0

Abstract

Parasitic crustacean Dendrogaster is completely endoparasitic and is not known from any marine invertebrates other than asteroids. Understanding the diversity of this group is considerably lagging, as it is an internal parasite that is not easily detected without dissecting the host. The group is thought to have coevolved with asteroids due to its endoparasitism; however, this has not been verified due to a lack of phylogenetic studies. A molecular phylogenetic analysis was required to understand the evolution of this very specialized genus. During a biodiversity survey at An'ei Seamount established as an offshore marine protected area in Japan, we discovered an unknown species of Dendrogaster inside a recently described species of asteroids. In this study, we attempted to elucidate the phylogenetic relationships of multiple species of Dendrogaster, including a new species, Dendrogaster nike sp. nov., collected from the An'ei Seamount of the Nishi-Shichito Ridge. We determined the COI and 18S gene sequences of some Dendrogaster species and reconstructed a phylogenetic tree. Upon plotting the information of the host and habitat depth onto the phylogenetic tree, evidence of coevolution between Dendrogaster and its host, which is commonly observed in endosymbiotic organisms, was not observed. Instead, our findings suggest that species diversification in Dendrogaster may have occurred based on habitat depth rather than coevolution with the host.

深海内寄生生物多样性的研究:石斛属(甲壳纲:尾足纲)的系统发育关系和西太平洋海底山的一个新种描述
寄生甲壳类动物是完全内寄生的,除了小行星外,在任何海洋无脊椎动物中都没有发现。了解这一群体的多样性相当滞后,因为它是一种内部寄生虫,不解剖宿主就不容易检测到。由于其内寄生性,该群被认为与小行星共同进化;然而,由于缺乏系统发育研究,这一点尚未得到证实。要了解这个非常特殊的属的进化,需要进行分子系统发育分析。在日本近海海洋保护区安溪海山进行生物多样性调查时,我们在一种最近发现的小行星物种中发现了一种未知的树endrogaster物种。在本研究中,我们试图阐明多种石斛属植物的系统发育关系,其中包括一种新种——石斛属(Dendrogaster nike sp. nov.)。测定了部分石斛属植物的COI和18S基因序列,重建了系统发育树。将寄主和生境深度信息绘制到系统发育树中,没有观察到在内共生生物中常见的树endrogaster与寄主共同进化的证据。相反,我们的研究结果表明,树endrogaster的物种多样化可能是基于栖息地深度而不是与宿主共同进化。
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来源期刊
CiteScore
4.60
自引率
4.20%
发文量
144
审稿时长
18.3 weeks
期刊介绍: Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.
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