Am Nat. 2020 Feb;195(2):231-246. doi: 10.1086/706904. Epub 2019 Dec 23.
Spreading populations are subject to evolutionary processes acting on dispersal and reproduction that can increase invasion speed and variability. It is typically assumed that dispersal and demography traits evolve independently, but abundant evidence points to correlations between them that may be positive or negative and genetic, maternal, or environmental. We sought to understand how demography-dispersal correlations modify the eco-evolutionary dynamics of range expansion. We first explored this question with the beetle , a laboratory model in which evolutionary acceleration of invasion has been demonstrated. We then built a simulation model to explore the role of trait correlations in this system and more generally. We found that positive correlations amplify the positive influence of evolution on speed and variability while negative correlations (such as we found empirically) constrain that influence. Strong negative genetic correlations can even cause evolution to decelerate invasion. Genetic and nongenetic (maternal and environmental) correlations had similar effects on some measures of invasion but different effects on others. Model results enabled us to retrospectively explain invasion dynamics and trait evolution in and may similarly aid the interpretation of other field and laboratory studies. Nonindependence of demography and dispersal is an important consideration for understanding and predicting outcomes of range expansion.
扩散种群受到作用于扩散和繁殖的进化过程的影响，这可能会增加入侵速度和变异性。通常假设扩散和种群动态特征是独立进化的，但大量证据表明它们之间存在正相关或负相关，并且可能是遗传的、母体的或环境的。我们试图了解种群动态-扩散相关性如何改变范围扩展的生态进化动态。我们首先使用甲虫 ，这是一种实验室模型，在该模型中已经证明了入侵的进化加速，来探索这个问题。然后，我们构建了一个模拟模型来探索在这个系统中以及更一般地说，特征相关性的作用。我们发现，正相关放大了进化对速度和变异性的积极影响，而负相关（如我们经验证发现的）则限制了这种影响。强负遗传相关性甚至可能导致进化减缓入侵。遗传和非遗传（母体和环境）相关性对某些入侵度量具有相似的影响，但对其他度量具有不同的影响。模型结果使我们能够追溯性地解释 和 的入侵动态和特征进化，并且可能同样有助于解释其他现场和实验室研究。种群动态和扩散的非独立性是理解和预测范围扩展结果的一个重要考虑因素。
