Distribution and host range of a highly invasive parasitic copepod

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Markéta Ondračková, Maria Yu. Tkachenko, Lukáš Vetešník, Jiří Hronek, Michal Janáč
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Abstract

The parasitic copepod Neoergasilus japonicus (Ergasilidae), native to East Asia, has spread rapidly around the world over the past half-century and now represents a clear example of successful parasitic invader. The species is now found in western Asia, Europe, America and Africa, with aquaculture and fish introductions identified as the primary vectors of dispersal. Regional field investigations have revealed surprisingly high number of affected localities, indicating potentially wider distribution than currently recognised. Neoergasilus japonicus exhibits low host specificity, parasitising a diverse range of freshwater fishes. This study updates the global fish host species list to 132, spanning 27 families across 15 orders, with Cypriniformes identified as the most susceptible host species. Under experimental conditions in this study, however, N. japonicus avoided its natural host, topmouth gudgeon Pseudorasbora parva, suggesting a level of resistance to its native parasite. Piscivorous and demersal fish were less infected by copepods than planktivorous, benthivorous, pelagic and benthopelagic species, reflecting the ecology of both the parasite and its hosts. An ability to re-attach to another host, though limited, was confirmed under experimental conditions. Recognising the ecological impacts and potential consequences associated with the introduction of non-native parasites emphasises the need for continuous monitoring and research globally.

Abstract Image

高入侵性寄生桡足类的分布和寄主范围
原产于东亚的寄生桡足类日本桡足虫(Ergasilidae)在过去半个世纪中迅速扩散到世界各地,现在已成为成功寄生入侵的一个明显例子。该物种现已遍布西亚、欧洲、美洲和非洲,水产养殖和鱼类引进被确定为主要传播媒介。区域实地调查显示,受影响的地方数量惊人,表明其分布范围可能比目前公认的更广。日本新黑线蝇(Neoergasilus japonicus)的宿主特异性很低,可寄生于多种淡水鱼类。这项研究将全球鱼类宿主物种清单更新为 132 种,横跨 15 目 27 科,其中鲤形目被确定为最易感宿主物种。然而,在本研究的实验条件下,日本鲤鱼避开了其天然宿主--上口姬鱼(Pseudorasbora parva),这表明日本鲤鱼对其本地寄生虫具有一定程度的抵抗力。与浮游、底栖、中上层和底层鱼类相比,食鱼和底栖鱼类受桡足类感染的程度较低,这反映了寄生虫及其宿主的生态学特征。在实验条件下,寄生虫重新附着于另一宿主的能力虽然有限,但已得到证实。认识到与引入非本地寄生虫相关的生态影响和潜在后果,强调了在全球范围内进行持续监测和研究的必要性。
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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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