来自近北极胫鱼(Leuciscidae)的Gyrodactylus mediotorus和G. crysoleucas(Gyrodactylidae)的种内变异:正在进行的物种分化、宿主转换和寄生虫迁移的证据。

IF 2.3 2区 医学 Q2 PARASITOLOGY Parasite Pub Date : 2024-01-01 Epub Date: 2024-06-11 DOI:10.1051/parasite/2024023
Chahrazed Rahmouni, Mária Seifertová, Megan G Bean, Andrea Šimková
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引用次数: 0

摘要

对美国德克萨斯州瓜达卢佩河(Guadalupe River)中的Cyprinella venusta和Notropis cf. stramineus进行的寄生虫学调查发现,C. venusta身上存在Gyrodactylus crysoleucas Mizelle和Kritsky,1967年;这两种鱼身上还存在Gyrodactylus mediotorus King、Marcogliese、Forest、McLaughlin和Bentzen,2013年。这代表了这两种天牛的新寄主和地点记录。之前从非本地的加利福尼亚隐翅天牛和明尼苏达州的养殖种群中鉴定出的隐翅天牛在形态和遗传学方面表现出种内变异性,这是一种与距离隔离相关的本地适应性。研究结果进一步证实 G. crysoleucas 是美国西部的外来物种,并表明 C. venusta 和 N. crysoleucas 之间存在宿主转换。在 G. mediotorus 与 C. venusta 和 N. cf. stramineus(瓜达卢佩河)之间,观察到 G. mediotorus 在形态学和遗传学上的保守性,而在所研究的 G. mediotorus 标本与 Notropis hudsonius 标本之间,发现与形态学差异相关的 ITS 序列遗传差异比考虑到 Notropis texanus 的寄生虫时更大。G. mediotorus的地理亚群分离可能表明,正在进行的物种分化与北美洲的更新世冰川有关,也与水文障碍有关,这些障碍促进了物种分化的不同进化路径。我们建议,深入研究Gyrodactylus种群将有助于了解这些寄生虫的物种分化及其对近地鱼类宿主的适应。
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Intraspecific variation in Gyrodactylus mediotorus and G. crysoleucas (Gyrodactylidae) from Nearctic shiners (Leuciscidae): evidence for ongoing speciation, host-switching, and parasite translocation.

A parasitological investigation of Cyprinella venusta and Notropis cf. stramineus sampled in Texas, USA, in the Guadalupe River, revealed the presence of Gyrodactylus crysoleucas Mizelle and Kritsky, 1967 on C. venusta, and Gyrodactylus mediotorus King, Marcogliese, Forest, McLaughlin & Bentzen, 2013 on both fish species. This represents new leuscicid fish hosts and locality records for these two gyrodactylids. Gyrodactylus crysoleucas previously identified from both non-native Californian Notemigonus crysoleucas and from farmed stocks in Minnesota demonstrated intraspecific variability in terms of morphology and genetics as a local adaptation associated with isolation by distance. Results further confirmed G. crysoleucas as alien in the western USA and suggested host-switching involving C. venusta and N. crysoleucas. Conservative morphology and genetics on the part of G. mediotorus from C. venusta and N. cf. stramineus (Guadalupe River) was observed, while higher genetic divergence in the ITS sequences associated with morphological discrepancy was found between the studied G. mediotorus specimens and those of Notropis hudsonius than when considering the parasites of Notropis texanus. The separation of G. mediotorus into geographical subgroups may indicate ongoing speciation linked to the Pleistocene glaciations in North America, and to hydrographic barriers that facilitated separate evolutionary paths leading to speciation. We suggest that deep investigations of Gyrodactylus populations will help to understand the speciation of these parasites and their adaptation to Nearctic fish hosts.

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来源期刊
Parasite
Parasite 医学-寄生虫学
CiteScore
5.50
自引率
6.90%
发文量
49
审稿时长
3 months
期刊介绍: Parasite is an international open-access, peer-reviewed, online journal publishing high quality papers on all aspects of human and animal parasitology. Reviews, articles and short notes may be submitted. Fields include, but are not limited to: general, medical and veterinary parasitology; morphology, including ultrastructure; parasite systematics, including entomology, acarology, helminthology and protistology, and molecular analyses; molecular biology and biochemistry; immunology of parasitic diseases; host-parasite relationships; ecology and life history of parasites; epidemiology; therapeutics; new diagnostic tools. All papers in Parasite are published in English. Manuscripts should have a broad interest and must not have been published or submitted elsewhere. No limit is imposed on the length of manuscripts, but they should be concisely written. Papers of limited interest such as case reports, epidemiological studies in punctual areas, isolated new geographical records, and systematic descriptions of single species will generally not be accepted, but might be considered if the authors succeed in demonstrating their interest.
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