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Relationship between population fluctuation pattern and spatial genetic structure in grey-sided vole populations in Hokkaido, Japan

日本北海道灰边田鼠种群种群波动格局与空间遗传结构的关系

基本信息

批准号：
17370006
负责人：
SAITOH Takashi
金额：
$ 8.51万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17370006/
关键词：
the grey-sided vole population dynamics genetic spatial structure geographic variation DNA 周期性

项目摘要

Population Ecology, which is aimed to analyze patterns of population dynamics and spatial distribution and to elucidate mechanisms generating those patterns, is one of research fields of Ecology. Ecological studies on rodent populations have traditionally led this research field since Charles S. Elton (1924). Studies on rodent populations in Hokkaido, Japan have been well known with rich time series data sets. Although various analyses of temporal changes in rodent abundance have been done using those data sets, the relationship between temporal changes in abundance and spatial structure of the populations is a new perspective of this research field.In this study, we focus a geographic gradient of the pattern of population dynamics observed in grey-sided vole populations in Hokkaido: populations in north-eastern parts are cyclic, whereas those in south-western parts are non-cyclic and we expected that genetic spatial structure of the populations show a similar geographic gradient. However, the genetic spatial structure was more complex than expected. Genetic distances were short among some remote populations and genetic distances among some neighboring populations were long as well as those among remote populations. Those results indicate that genetic spatial structure of the vole population was not formed by geographic factors (distance or topography) and that ecological factors may be more important.Problems on complex genetic spatial structure have recently attracts many researchers and may develop to a hot topic in Molecular Ecology. This study may contribute to this research field by suggesting importance of ecological factors on those problems.

种群生态学是生态学的研究领域之一，其目的是分析种群动态和空间分布格局，并阐明形成这些格局的机制。啮齿动物种群的生态学研究一直是这一研究领域的前沿。Elton（1924）.日本北海道啮齿动物种群的研究以其丰富的时间序列数据集而闻名。虽然利用这些数据集对啮齿动物数量的时间变化进行了各种分析，但数量的时间变化与种群空间结构之间的关系是这一研究领域的新视角。本研究的重点是在北海道观察到的灰边田鼠种群动态格局的地理梯度：东北部的种群是周期性的，而西南部的种群是非周期性的，我们预计种群的遗传空间结构也表现出类似的地理梯度。然而，遗传空间结构比预期的要复杂。部分远缘居群间的遗传距离较短，部分邻近居群间的遗传距离较长，远缘居群间的遗传距离也较长。这些结果表明，田鼠种群的遗传空间结构不是由地理因素（距离或地形）决定的，生态因素可能更为重要，复杂遗传空间结构的研究已成为分子生态学的热点问题。本研究可能有助于这一研究领域提出的重要性，生态因素对这些问题。