Ticks from mainland Australia (Victoria, New South Wales and Queensland) and Tasmania, identified morphologically as either Ixodes holocyclus or Ixodes cornuatus, were compared genetically using 24 enzyme loci. The results showed that ticks from three localities in Victoria were genetically similar to I. cornuatus in Tasmania, but both groups had fixed genetic differences at >45% of loci compared with other ticks on the mainland. In addition, there were fixed genetic differences at 0-60% of loci among I. holocyclus from different localities on the mainland. Ixodes holocyclus samples could be divided into four distinct clusters (with fixed genetic differences >15%), three of which were represented by one or two specimens. Nonetheless, these electrophoretic data suggest that I. holocyclus represents a species complex. The results also showed that the morphological criteria used to identify specimens were not always accurate because several specimens had been mis-identified morphologically. Despite limitations with the morphological identification, this study has demonstrated that I. cornuatus can be distinguished from the I. holocyclus species complex using six enzyme loci, providing the foundation for a re-examination of morphological characteristics. The present study has shown that I. cornuatus and the I. holocyclus complexes have a greater distribution than previously reported, with both occurring in sympatry at Cape Patterson, on the southern coastline of Victoria.

译文

:使用24个酶基因座对来自澳大利亚大陆(维多利亚州,新南威尔士州和昆士兰州)和塔斯马尼亚州的Ti虫进行了形态学比较,这些Ti虫在形态学上被鉴定为全环凤仙或角须凤仙。结果表明,维多利亚州三个地方的tick在遗传上与塔斯马尼亚州的角I相似,但与大陆上的其他tick相比,两组的固定遗传差异均在> 45%的位点上。另外,来自大陆不同地区的全环金枪鱼在基因座的0-60%处存在固定的遗传差异。整轴虫的样本可分为四个不同的类群(固定的遗传差异> 15%),其中三个由一个或两个标本代表。尽管如此,这些电泳数据表明全环线虫代表一种物种复合体。结果还表明,用于鉴定标本的形态学标准并不总是准确的,因为一些标本在形态上被错误地鉴定。尽管在形态学鉴定上有局限性,但这项研究表明,可以使用六个酶基因座将角corn与全轮虫物种区分开,为形态特征的重新研究奠定了基础。本研究表明,角鬣狗和全环线虫的分布比以前报道的要大,它们都发生在维多利亚州南部海岸线的海角帕特森的交界处。

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