Taxonomic status of the vole in Daikoku Island, Hokkaido, Japan: examination based on morphology and genetics
Taxonomic status of the vole in Daikoku Island, Hokkaido, Japan: examination based on morphology and genetics
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DOI：
10.3106/1348-6160(2007)32
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发表时间：
2007-03-01
期刊：
影响因子：
1
通讯作者：
Abe, Hisashi
中科院分区：
文献类型：
--
作者：
de Guia, Anna Pauline;Saitoh, Takashi;Abe, Hisashi
根据形态学数据，有人认为日本北海道的大国岛栖息着一种不同形式的红腹鼠（Clethrionomys rufocanus，Sundevall 1846）。这被一些研究人员视为不同的物种，因此，造成了混乱，以什么是它的真实的分类地位。除此之外，有人认为岛上还有另一种田鼠。因此，我们比较了来自大国岛的田鼠与来自其附近大陆的种群Akkeshi和Shibecha以及另外两个相关物种C。rutilus和C.雷克斯。对三个种群的81只田鼠线粒体DNA控制区（745 bp）进行直接测序，共发现27种单倍型。在Daikoku中观察到一个单一的单倍型，在Akkeshi中鉴定出10个，在Shibecha中鉴定出18个。对上颚第三磨牙的诊断模式的检查表明，在岛上收集的所有标本都是C。红褐色的然而，判别函数分析的头骨测量的田鼠从大国和大陆（Akkeshi和Shibecha）表示形态分化。我们的遗传学和形态学结果证实了一个单一的田鼠物种，C。rufocanus，目前在大国岛，这相对最近起源于大陆北海道。
It has been suggested based on morphological data that a distinct form of Clethrionomys rufocanus (Sundevall 1846) inhabits Daikoku Island, Hokkaido, Japan. This has been treated by some researchers as a different species and has thus, created confusion as to what its real taxonomic status is. Aside from this, it has been suggested that another species of vole exists in the island. We thus compared the genetic and morphological variation of the voles from Daikoku Island with populations from its nearby mainland, Akkeshi and Shibecha and with the two other related species, C. rutilus and C. rex. Direct sequencing of the partial mtDNA control region (745-bp) in 81 voles from the three populations revealed 27 haplotypes. A single unique haplotype was observed in Daikoku, 10 were identified in Akkeshi, and 18 were from Shibecha. Examination of the diagnostic upper third molar pattem indicated that all specimens collected in the island were C. rufocanus. However, discriminant function analysis of the cranial measurements of voles from Daikoku and the mainland (Akkeshi and Shibecha) indicated morphological differentiation. Our genetic and morphological results confirm that a single vole species, C. rufocanus, is present in Daikoku Island, which relatively recently originated from mainland Hokkaido.