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首页> 外文期刊>The Journal of Heredity >An Investigation for Population Maintenance Mechanism in a Miniature Garden: Genetic Connectivity or Independence of Small Islet Populations of the Ryukyu Five-Lined Skink
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An Investigation for Population Maintenance Mechanism in a Miniature Garden: Genetic Connectivity or Independence of Small Islet Populations of the Ryukyu Five-Lined Skink

机译：微型花园中种群维持机制的研究：琉球五行石龙子小岛种群的遗传连通性或独立性。

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摘要

The Ryukyu five-lined skink (Plestiodon marginatus) is an island lizard that is even found in tiny islets with less than half a hectare of habitat area. We hypothesized that the island populations are maintained under frequent gene flow among the islands or independent of each other. To test our hypotheses, we investigated genetic structure of 21 populations from 11 land-bridge islands that were connected during the latest glacial age, and 4 isolated islands. Analyses using mitochondrial cytochrome b gene sequence (n = 67) and 10 microsatellite loci (n = 235) revealed moderate to high levels of genetic differentiation, existence of many private alleles/haplotypes in most islands, little contemporary migration, a positive correlation between genetic variability and island area, and a negative correlation between relatedness and island area. These evidences suggest a strong effect of independent genetic drift as opposed to gene flow, favoring the isolation hypothesis even in tiny islet populations. Isolation-by-distance effect was demonstrated and it became more prominent when the 4 isolated islands were excluded, suggesting that the pattern is a remnant of the land-bridge age. In a few island populations, however, the possibility of occasional overwater dispersals was partially supported and therefore could not be ruled out.
机译：琉球五行石龙子（Plestiodon marginatus）是一种岛上的蜥蜴，甚至在栖息地不到一半公顷的小岛上也发现了。我们假设岛屿人口在岛屿之间频繁的基因流动下或彼此独立。为了检验我们的假设，我们调查了最近冰河时期连接的11个陆桥岛的21个种群的遗传结构和4个孤岛。使用线粒体细胞色素b基因序列（n = 67）和10个微卫星基因座（n = 235）进行的分析显示，中等至高水平的遗传分化，大多数岛屿上存在许多私人等位基因/单倍型，当代迁徙很少，遗传之间存在正相关变异性和岛屿面积，以及相关性和岛屿面积之间呈负相关。这些证据表明，独立的遗传漂移对基因流动有很强的影响，即使在极小的胰岛种群中，也有利于分离假设。证明了按距离隔离的效果，当排除了4个隔离的岛屿时，隔离效果更加突出，表明该模式是陆桥时代的残余。但是，在少数岛屿人口中，偶尔出现水面扩散的可能性得到了部分支持，因此不能排除。

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