Manel S, Bellemain E, Swenson J E, François O
Laboratoire d'Ecologie Alpine, Equipe Génomique des Populations et Biodiversité, BP 53, 38041 Grenoble cedex 9, France.
Mol Ecol. 2004 May;13(5):1327-31. doi: 10.1111/j.1365-294X.2004.02074.x.
We reanalysed the spatial structure of the Scandinavian brown bear (Ursus arctos) population based on multilocus genotypes. We used data from a former study that had presumed a priori a specific population subdivision based on four subpopulations. Using two independent methods (neighbour-joining trees and Bayesian assignment tests), we analysed the data without any prior presumption about the spatial structure. A subdivision of the population into three subpopulations emerged from our study. The genetic pattern of these subpopulations matched the three geographical clusters of individuals present in the population. We recommend considering the Scandinavian brown bear population as consisting of three (instead of four) subpopulations. Our results underline the importance of determining genetic structure from the data, without presupposing a structure, even when there seems to be good reason to do so.
我们基于多位点基因型重新分析了斯堪的纳维亚棕熊（ Ursus arctos）种群的空间结构。我们使用了一项先前研究的数据，该研究事先假定基于四个亚种群存在特定的种群细分。我们使用两种独立的方法（邻接法树和贝叶斯分配测试），在没有任何关于空间结构的先验假设的情况下分析了数据。我们的研究结果显示该种群可细分为三个亚种群。这些亚种群的遗传模式与种群中存在的三个地理个体集群相匹配。我们建议将斯堪的纳维亚棕熊种群视为由三个（而非四个）亚种群组成。我们的结果强调了从数据中确定遗传结构的重要性，即不预先假定结构，即使似乎有充分理由这样做。
