Geographic variation and biogeography of terrestrial vertebrates around the Tokara Strait, northern Ryukyus, Japan

日本琉球北部吐噶喇海峡周围陆生脊椎动物的地理变异和生物地理学

基本信息

批准号：
09839024
负责人：
OTA Hidetoshi
金额：
$ 1.6万
依托单位：
University of the Ryukyus
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09839024/
关键词：
Reptiles Biogeography Geographic variation Speciation Geographic isolation Dispersal Ryukyu Archipelago Tokara Strait

项目摘要

The Tokara Strait, usually regarded as a boundary of the Oriental and Palearetic faunal realms, is considered to have been consistently interrupting dispersals of terrestrial fauna since its initial formation in the late Tertiary. However, several lineages of terrestrial animals are actually distributed on both sides of this strait, making interesting subjects from view points of historical biogeography and population systematics. To elucidate the dispersal and isolation of terrestrial animals across the Tokara Strait, we examined for several vertebrates the relative degrees of differentiations among populations around this strait. Quantitative morphological and allelic data were analyzed for distances among populations.Results have indicated that in most lineages examined, such as Ateuchosaurus pellopleurus, Gekko hokouensis and Eumeces marginatus, populations in both sides of the strait showed very little variation. This indicates the occurrence of oversea dispersals across the strai … More t in an unexpectedly high frequency in these lineages. This results strongly suggest the possible overstimation of the isolation effect of insularization upoiv the terrestrial organisms in other areas of the Ryukyus and Taiwan, where the Kuroshio Current, seemingly the most influensive agent of orga-nismal dispersals in this region, is dominant as in the Tokara Strait.Some taxonomic groups showing more sporadic distributions on both sides of the strait have been considered as remnants of landbridge dispersals prior to the formation of the Tokara Strait. However, our studies have revealed that there are no sister-relationships between representatives of both sides of the strait in some of such taxa (e.g., Cistoclemmys, including the fossil taxa), and that others (e.g., Pelodiscus sinensis), surely showing close genetic affinities, have been transported artificially across the strait. Such a result circumstantially support the frequent seacurrent-aided dispersal hypothesis for the former three lineages by confirming the long history of the Tokara Strait. Less

托卡拉海峡（Tokara Hart）通常被认为是东方和过度的动物区域的边界，被认为自来一直在中断陆地动物群以来一直在中断陆地动物的散布。但是，实际上，几种陆地动物的谱系分布在这根稻草的两侧，从历史生物地理和人口系统学的观点中成为有趣的主题。为了阐明陆地动物在Tokara海峡中的扩散和分离，我们检查了几个脊椎动物，这些脊椎动物的相对程度是该Strat周围种群中分化的相对程度。分析了数量的形态和等位基因数据的距离之间的距离。结果表明，在大多数谱系中，如Ateuchosaurus Pearleurus，Gekko Hokouensis和Eumeces Marginatus，稻草两侧的种群都显示出很小的变化。这表明在这些线路中出乎意料的高频率中，海外分散的发生。这一结果强烈表明，岛上的隔离效应可能过度刺激，在Ryukyus和Taiwan的其他领域的陆地生物体在该地区的黑鲁岛电流（似乎是该地区最有影响力的人类群体分散的推动者）在该地区的分类群体中占主导地位，在该地区占主导地位，在该地区占主导地位。在形成Tokara海峡之前分散。但是，我们的研究表明，在某些类群中代表稻草的两面之间没有姐妹关系（例如，包括化石类群），而其他人（例如，pelodiscus sinensis）肯定表现出了紧密的遗传亲和，已经在整个稻草上进行了交通。这样的结果在环境中支持了前三个谱系的频繁海流辅助分散假设，通过确认了托卡拉海峡的悠久历史。较少的