Occurrence of Two Types of Hynobius naevius in Northern Kyushu, Japan (Amphibia: Urodela)
Occurrence of Two Types of Hynobius naevius in Northern Kyushu, Japan (Amphibia: Urodela)
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日本九州北部出现两种类型的 Hynobius naevius（两栖类：Urodela）
DOI：
10.2108/zsj.20.1467
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Shin'ichi Sato
中科院分区：
文献类型：
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作者：
A. Tominaga;M. Matsui;K. Nishikawa;Shin'ichi Sato
摘要对日本福冈县4个地区的黑小鲵进行了遗传多样性调查，日本九州北方的研究发现，两种同域遗传类型（A和B）在每个地点的4个基因座（ACOH-A、ACOH-B、ADH-A和SOD-A）的等位基因频率上存在明显差异。形态学研究也证明了两种遗传类型之间的明显区别，A型的SVL约为75 mm，背蓝紫色，无斑纹，犁骨齿列较短，而B型的SVL约为60 mm，底色红紫色，有浅斑纹。这些结果强烈表明，这两种类型之间发生生殖隔离，它们可以被视为独立的物种。本州西部的丰田町和九州中部的矢部町的人口，都靠近福冈县，分别与A型和B型非常相似。从这些结果，我们认为，两个进化谱系，首先在本州西部和九州南部的异地发展，其次接触，并成为同域的北方九州地区。
Abstract A survey to examine genetic variation among Hynobius naevius from four localities of Fukuoka Pref., northern Kyushu, Japan, resulted in the detection of two, sympatric, genetic types (A and B) that are clearly different in the allelic frequencies of four loci (ACOH-A, ACOH-B, ADH-A, and SOD-A) in each locality. Morphological investigations between the two genetic types also proved that they are clearly discriminated; the type A is about 75 mm in SVL, lacks mottling pattern on bluish purple dorsum, and possesses relatively short vomerine teeth series, while the type B is about 60 mm in SVL, and has light mottling on reddish purple ground color. These results strongly suggest that reproductive isolation occurs between these two types, and that they could be regarded as separate species. Populations from Toyota-cho, western Honshu, and Yabe-machi, central Kyushu, both close to Fukuoka Pref., were very similar to the types A and B, respectively. From these results, we consider that two evolutionary lineages that first evolved allopatrically in western Honshu and southern Kyushu secondarily contacted and became sympatric in the region of northern Kyushu.