寄生于丹纳蟹 Chionoecetes bairdi 的马鬃线虫（Nematomorpha），以及关于宿主与寄生虫系统发育关系的说明

IF 1.1 4区农林科学 Q3 FISHERIES

Diseases of aquatic organisms Pub Date : 2024-09-12 DOI:10.3354/dao03815

Keiichi Kakui

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引用次数: 0

摘要

摘要：线虫在其生命周期中利用海洋甲壳类寄主；迄今已有 16 个十足目和 1 个等足目虫属作为寄主属的报道。本研究报告了首例寄生在丹拿蟹 Chionoecetes bairdi 中的 Nectonema，增加了另一个已知的宿主属。从两只卵生雌蟹的体腔中各发现了一只线虫幼体。从 1 个 Nectonema 个体中测定了 18S rRNA 基因的核苷酸序列（1854 bp）。该 18S 序列与来自等足类宿主的 Nectonema sp.、N. agile 和 N. munidae 的 18S 序列的木村 2 参数（K2P）距离分别为 10.0%、2.0% 和 1.7%。在基于18S的树中，未知物种是由N. agile和N. munidae组成的支系的姊妹类群，这两个支系也都利用十足目寄主。寄生于十足目动物体内的3个Nectonema物种之间的系统发育关系与宿主的系统发育关系不一致，不支持线虫-宿主共同进化的假说。

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Nectonema horsehair worms (Nematomorpha) parasitic in the Tanner crab Chionoecetes bairdi, with a note on the relationship between host and parasite phylogeny

ABSTRACT: Nectonema nematomorphs utilize marine crustacean hosts in their life cycle; 16 decapod and 1 isopod genera have been reported to date as host genera. This study reports the first case of Nectonema parasitic in the Tanner crab Chionoecetes bairdi, adding another known host genus. A single nematomorph juvenile was recovered from the body cavity of each of 2 ovigerous female crabs. A nucleotide sequence for the 18S rRNA gene (1854 bp) was determined from 1 Nectonema individual. The 18S sequence showed Kimura 2-parameter (K2P) distances of 10.0, 2.0, and 1.7% from 18S sequences from Nectonema sp. from an isopod host, N. agile, and N. munidae, respectively. In an 18S-based tree, the unknown species was the sister taxon to a clade comprising N. agile and N. munidae, both of which also utilize decapod hosts. The phylogenetic relationships among the 3 Nectonema species parasitic in decapods were not congruent with the phylogeny of the hosts, not supporting a hypothesis of nematomorph-host co-evolution.

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来源期刊

Diseases of aquatic organisms 农林科学-兽医学

CiteScore

3.10

自引率

0.00%

发文量

审稿时长

8-16 weeks

期刊介绍： DAO publishes Research Articles, Reviews, and Notes, as well as Comments/Reply Comments (for details see DAO 48:161), Theme Sections and Opinion Pieces. For details consult the Guidelines for Authors. Papers may cover all forms of life - animals, plants and microorganisms - in marine, limnetic and brackish habitats. DAO''s scope includes any research focusing on diseases in aquatic organisms, specifically: -Diseases caused by coexisting organisms, e.g. viruses, bacteria, fungi, protistans, metazoans; characterization of pathogens -Diseases caused by abiotic factors (critical intensities of environmental properties, including pollution)- Diseases due to internal circumstances (innate, idiopathic, genetic)- Diseases due to proliferative disorders (neoplasms)- Disease diagnosis, treatment and prevention- Molecular aspects of diseases- Nutritional disorders- Stress and physical injuries- Epidemiology/epizootiology- Parasitology- Toxicology- Diseases of aquatic organisms affecting human health and well-being (with the focus on the aquatic organism)- Diseases as indicators of humanity''s detrimental impact on nature- Genomics, proteomics and metabolomics of disease- Immunology and disease prevention- Animal welfare- Zoonosis