Parentage assignment detects frequent and large‐scale dispersal in water voles
Parentage assignment detects frequent and large‐scale dispersal in water voles
复制标题
亲子归属检测发现水田鼠频繁且大规模的扩散
作者：
Sandra Telfer;S. Piertney;J. Dallas;W. A. Stewart;F. Marshall;Jennifer Gow;X. Lambin
估计扩散的速度和规模对于预测分散种群的动态是必不可少的，但经验估计通常是不精确的，往往是负偏差的。我们最大限度地检测小，细分群体的水田鼠（Arvicola terrestris）之间的传播事件，使用一种新的方法，结合直接捕获标记再捕获与微卫星基因分型，以确定父母和后代在不同的人群，从而推断传播。我们使用从诱捕数据中已知的分散在种群之间的个体来验证该方法。当地人口的少年扩散率高，但成年人的扩散水平低得多。在春季繁殖种群中，19%的雌性和33%的雄性离开了前一年的纳塔尔种群。种群间平均扩散距离为1.8公里（范围0.3-5.2公里）。总体而言，扩散模式符合负指数函数。来自基因分型的信息将估计的扩散速率和规模分别增加了三倍和两倍，因此代表了一种强大的工具，可以提供更真实的扩散参数估计。
Estimating the rate and scale of dispersal is essential for predicting the dynamics of fragmented populations, yet empirical estimates are typically imprecise and often negatively biased. We maximized detection of dispersal events between small, subdivided populations of water voles (Arvicola terrestris) using a novel method that combined direct capture–mark–recapture with microsatellite genotyping to identify parents and offspring in different populations and hence infer dispersal. We validated the method using individuals known from trapping data to have dispersed between populations. Local populations were linked by high rates of juvenile dispersal but much lower levels of adult dispersal. In the spring breeding population, 19% of females and 33% of males had left their natal population of the previous year. The average interpopulation dispersal distance was 1.8 km (range 0.3–5.2 km). Overall, patterns of dispersal fitted a negative exponential function. Information from genotyping increased the estimated rate and scale of dispersal by three‐ and twofold, respectively, and hence represents a powerful tool to provide more realistic estimates of dispersal parameters.
DOI：
10.1073/pnas.94.17.9197
发表时间：
1997-08-19
影响因子：
11.1
作者：
Rannala, B;Mountain, JL
通讯作者：
Mountain, JL