文章基本信息

标题：A population genetic study on the relationship between medaka fish and the spread of wet-rice cultivation across the Japanese archipelago
本地全文：下载
作者：TAKAFUMI KATSUMURA ; SHOJI ODA ; KENTARO TSUKAMOTO 等
期刊名称：Anthropological Science
印刷版ISSN：0918-7960
电子版ISSN：1348-8570
出版年度：2012
卷号：120
期号：1
页码：81-89
DOI：10.1537/ase.110525
语种：English
出版社：The Anthropological Society of Nippon
摘要：It has been generally thought that a tiny freshwater fish, medaka ( Oryzias latipes ), has expanded its habitat into the Japanese archipelago as wet-rice cultivation spread across the region, and hence the distribution of medaka should be a matter of anthropological interest. However, there has been no study to verify this popular belief. To address the issue, we sampled wild medaka, and undertook genetic analyses of its populations. We collected 976 individual medaka from 13 local wild sites, which included 11 paddy-field irrigation channels and two ponds. The gene tree constructed based on nucleotide sequences of mitochondrial genome D-loop region showed no discrepancy in the topology, which is presumed to reflect the northern Kyushu origin of the southern Japanese medaka. Population genetic statistics indicated that the medaka populations in west Japan have greater genetic diversity (heterozygosity) than those in east Japan, supporting the hypothesis that the medaka originate from northern Kyushu. Hence, we argue that the current medaka distribution can be attributed to their past migration event(s) following the expansion of paddy fields from northern Kyushu to the eastern part of the Japanese archipelago.
关键词：medaka;wet-rice cultivation;Yayoi migration;mtDNA;genetic diversity