Mitochondrial DNA variation of Gyrodactylus spp. (Monogenea, Gyrodactylidae) populations infecting Atlantic salmon, grayling, and rainbow trout in Norway and Sweden
Mitochondrial DNA variation of Gyrodactylus spp. (Monogenea, Gyrodactylidae) populations infecting Atlantic salmon, grayling, and rainbow trout in Norway and Sweden
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DOI：
10.1016/s0020-7519(03)00200-5
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发表时间：
2003-11-01
影响因子：
4
通讯作者：
Bakke, TA
中科院分区：
文献类型：
--
作者：
Hansen, H;Bachmann, L;Bakke, TA
从挪威、瑞典和拉脱维亚的萨尔莫鲑、胸腺鱼和虹鳟鱼等32个鲑科鱼类宿主种群的76个三代鱼标本中测定了线粒体细胞色素氧化酶I（COI）基因的约800 bp序列。Cot序列表明，三代虫和三代虫存在明显的种内分化。总共鉴定了12种单倍型，其分为5个支持良好的分支，3个分支与大西洋鲑鱼的寄生虫和2个分支与灰鲑鱼的寄生虫。将五个分支连接在一起的基部节点仅被弱支撑。因此，不支持所有G的单系性。salaris单倍型和所有G.胸腺单倍型G. salaris和G. thymalli可能表明G. salaris和G.胸腺代表（i）两个多型物种或（ii）一个多型物种，或（iii）指两个以上兄弟物种的复合体。mtDNA数据表明G. salaris和G. thymalli到挪威。G. salaris和G. Thymalli得到支持。这与早期关于G. salaris和G. thymalli到挪威。(C)2003年澳大利亚寄生虫学会由爱思唯尔有限公司出版。保留所有权利。
Approximately 800 bp of the mitochondrial cytochrome oxidase I (COI) gene were sequenced from 76 Gyrodactylus specimens of 32 salmonid host populations, i.e. from Salmo salar, Thymallus thymallus, and Oncorhynchus mykiss in Norway, Sweden and Latvia. The Cot sequences indicated a Substantial intraspecific differentiation of Gyrodactylus salaris and Gyrodactylus thymalli. In total, 12 haplotypes were identified which group into five well supported clades, three clades with parasites from Atlantic salmon and two clades with parasites from grayling. The basal nodes linking the five clades together are only weakly supported. Thus, there is no support for the monophyly of all G. salaris haplotypes and the monophyly of all G. thymalli haplotypes. The lack of rnonophyly of the mitochondrial haplotypes of G. salaris and G. thymalli may indicate that G. salaris and G. thymalli represent (i) two polytypic species or (ii) one polytypic species, or (iii) refer to a complex of more than two sibling species. The mtDNA data indicate multiple introductions of G. salaris and G. thymalli into Norway. A minimum of three independent introductions of G. salaris and two independent introductions of G. thymalli are supported. This is congruent with earlier hypotheses on the introduction of G. salaris and G. thymalli into Norway. (C) 2003 Australian Society for Parasitology Inc. Published by Elsevier Ltd. All rights reserved.