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首页> 外文期刊>Anthropological science: Journal of the Anthropological Society of Nippon >A population genetic study on the relationship between medaka fishand the spread of wet-rice cultivation across the Japanese archipelago
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A population genetic study on the relationship between medaka fishand the spread of wet-rice cultivation across the Japanese archipelago

机译：群岛鱼类与日本群岛湿稻栽培传播之间关系的种群遗传研究

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摘要

It has been generally thought that a tiny freshwater fish, medaka (Oryzias latipes), has ex-panded 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 under-took 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.
机译：人们普遍认为，随着湿稻的种植，该地区的一种淡水小鱼fish（Makaka）已将其栖息地扩展到日本群岛，因此的分布应该是人类学上的问题。 。但是，还没有研究来验证这种流行的信念。为了解决这个问题，我们对野生高med进行了采样，并对其种群进行了遗传分析。我们从13个当地野生地点收集了976个medaka，其中包括11个稻田灌溉渠道和两个池塘。基于线粒体基因组D-环区核苷酸序列构建的基因树在拓扑结构上没有差异，据推测可以反映出南部九的北部九州起源。人口遗传统计数据表明，日本西部的青aka种群比日本东部的青east种群具有更高的遗传多样性（杂合性），这支持了青aka起源于九州北部的假说。因此，我们认为当前的稻高田分布可归因于其过去的迁移事件，这是由于稻田从九州北部扩展到日本群岛的东部。

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