Serial sampling bridges a gap between ecological and genetical definitions of immigrant: an empirical test in a grey-sided vole population
Serial sampling bridges a gap between ecological and genetical definitions of immigrant: an empirical test in a grey-sided vole population
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DOI：
10.1007/s13364-018-0351-7
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发表时间：
2018-01
期刊：
影响因子：
1.5
通讯作者：
Toshiya Yamada;T. Saitoh
中科院分区：
文献类型：
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作者：
Toshiya Yamada;T. Saitoh
分配测试被认为具有估计当代移民率的潜力，并被认为是生态学方法(例如，标记-重新捕获和无线电/全球定位系统跟踪)的替代方法。然而，当传统的分配检验应用于遗传分化程度较低的群体时，它得到的结果与标记重获法的结果不同。这种差异源于对“移民”定义的不同；在标记-重新捕获方法中，移民是来自预定人口以外的个人，而在分配测试中，移民是来自其他遗传差异人口的个人。我们提出了分配测试的抽样设计，以弥合生态和遗传定义之间的差距。基于这一设计的分配测试应用程序根据一个局部种群的等位基因频率来识别移民，然后再进行分散。我们通过比较分配测试估计的迁移率和灰边田鼠(Myodes Ruafanus)种群的标记-重新捕获记录来测试所提出的抽样设计的效率，该种群与周围的种群在遗传上没有明显的差异。与传统分配测试的结果相比，所提出的设计在准确度上与标记再捕获的结果接近7%-30%，在检测功率方面观察到23%-54%的改进。分配测验的序列抽样可以弥补生态学方法和分配测验之间的差异。
The assignment test is believed to have the potential to estimate the contemporary rate of immigration and is considered as an alternative to ecological methods (e.g., mark-recapture and radio/GPS tracking). However, the conventional assignment test provides different results from those of the mark-recapture method, when it is applied to populations with low genetic differentiation from one another. The difference derives from a difference in the definition of “immigrant”; immigrants in the mark-recapture method are individuals coming from outside a predefined population, whereas immigrants in the assignment test are individuals coming from other genetically differentiated populations. We propose a sampling design of the assignment test bridging a gap between the ecological and genetical definition of immigrant. The assignment test application based on this design identifies immigrants referring to the allele frequency of a focal population before dispersal occurs. We tested the efficiency of the proposed sampling design by comparing immigration rates estimated by the assignment test with those from mark-recapture records of a grey-sided vole (Myodes rufocanus) population, which was not significantly genetically differentiated from the surrounding populations. The proposed design provided 7–30% closer results to those from the mark-recapture in accuracy, in comparison with results from the conventional assignment test, and in the detection power 23–54% improvement was observed. The serial sampling for the assignment test could bridge the differences between ecological methods and the assignment test.