Tjensvoll Kjersti, Glover Kevin A, Nylund Are
Department of Biology, University of Bergen, 5020 Bergen, Norway.
Dis Aquat Organ. 2006 Mar 2;68(3):251-9. doi: 10.3354/dao068251.
A total of 210 Lepeophtheirus salmonis collected from 7 locations (Scotland, Russia, Canada, Japan and 3 locations in Norway), were screened for sequence variation in 4 mitochondrial genes; ATPase subunit 6 (A6), Cytochrome b oxidase subunit I (COI), Cytochrome b (Cyt b) and 16S rRNA. A high level of intraspecific variation was observed within all genes. The majority of polymorphisms were present in single individuals only, which resulted in a high number of private haplotypes within each gene. Little evidence of genetic differentiation was observed among the 3 Norwegian locations or between L. salmonis samples from Norway, Scotland and Russia. Pairwise FST values indicated that a weak degree of sub-division between L. salmonis sampled in Canada and the Northeast Atlantic might, however, exist. All samples collected in the Atlantic were highly different from the Japanese sample. It is suggested that the lack of genetic differentiation among lice samples from the North Atlantic is a result of extensive gene flow mediated by passive transport of L. salmonis larvae, and the migratory pattern of its salmonid hosts.
从7个地点（苏格兰、俄罗斯、加拿大、日本以及挪威的3个地点）采集了共计210只鲑鱼虱，对其4个线粒体基因；ATP酶亚基6（A6）、细胞色素b氧化酶亚基I（COI）、细胞色素b（Cyt b）和16S rRNA的序列变异进行了筛查。在所有基因中均观察到高水平的种内变异。大多数多态性仅存在于单个个体中，这导致每个基因内出现大量私有单倍型。在挪威的3个地点之间，或来自挪威、苏格兰和俄罗斯的鲑鱼虱样本之间，几乎没有观察到遗传分化的证据。成对FST值表明，然而，在加拿大采集的鲑鱼虱与东北大西洋的鲑鱼虱之间可能存在微弱程度的细分。在大西洋采集的所有样本与日本样本高度不同。有人认为，北大西洋虱子样本之间缺乏遗传分化是由鲑鱼虱幼虫的被动传播以及其鲑科宿主的洄游模式介导的广泛基因流动的结果。
