Bartoszek Krzysztof, Glémin Sylvain, Kaj Ingemar, Lascoux Martin
Department of Mathematics, Uppsala University, Uppsala, 751 06, Sweden.
Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Uppsala, 752 36, Sweden; UMR 5554 ISEM, CNRS-Université de Montpellier-IRD-EPHE, Montpellier, France.
J Theor Biol. 2017 Sep 21;429:35-45. doi: 10.1016/j.jtbi.2017.06.011. Epub 2017 Jun 12.
The Ornstein-Uhlenbeck (OU) process plays a major role in the analysis of the evolution of phenotypic traits along phylogenies. The standard OU process includes random perturbations and stabilizing selection and assumes that species evolve independently. However, evolving species may interact through various ecological process and also exchange genes especially in plants. This is particularly true if we want to study phenotypic evolution among diverging populations within species. In this work we present a straightforward statistical approach with analytical solutions that allows for the inclusion of adaptation and migration in a common phylogenetic framework, which can also be useful for studying local adaptation among populations within the same species. We furthermore present a detailed simulation study that clearly indicates the adverse effects of ignoring migration. Similarity between species due to migration could be misinterpreted as very strong convergent evolution without proper correction for these additional dependencies. Finally, we show that our model can be interpreted in terms of ecological interactions between species, providing a general framework for the evolution of traits between "interacting" species or populations.
奥恩斯坦-乌伦贝克（OU）过程在分析系统发育中表型性状的进化方面起着重要作用。标准的OU过程包括随机扰动和稳定选择，并假设物种独立进化。然而，进化中的物种可能通过各种生态过程相互作用，并且还会交换基因，尤其是在植物中。如果我们想要研究物种内不同种群之间的表型进化，情况尤其如此。在这项工作中，我们提出了一种具有解析解的直接统计方法，该方法允许在一个共同的系统发育框架中纳入适应和迁移，这对于研究同一物种内种群之间的局部适应也可能是有用的。此外，我们还进行了一项详细的模拟研究，该研究清楚地表明了忽略迁移的不利影响。如果没有对这些额外的依赖性进行适当校正，由于迁移导致的物种间相似性可能会被误解为非常强烈的趋同进化。最后，我们表明我们的模型可以根据物种间的生态相互作用来解释，为“相互作用”的物种或种群之间的性状进化提供了一个通用框架。
