接触网络的方向性抑制了进化动力学中的选择压力
Directionality of contact networks suppresses selection pressure in evolutionary dynamics
摘要：
不同类型的个体，可能是遗传的，文化的，或者其他的，具有不同水平的适应性，经常为了繁殖和生存而竞争。一个合适的类型通常有更高的机会传播他们的副本给其他个人。在野生型个体群体中引入的单个突变类型的固定概率量化了突变类型传播的可能性。突变体类型的过量适合度增加了多少其固定概率，即选择压力，在评估引入突变体的影响时很重要。以往的研究大多是基于无向和无权的个体接触网络，研究表明选择压力取决于网络的结构和繁殖规则。真实的生态和社会互动网络通常是有向的或加权的。在这里，我们研究选择压力是如何调制的方向性的相互作用下的几个更新规则。我们的结论是双重的。首先，方向性降低了不同网络和更新规则的选择压力。第二，在给定的网络中，死亡事件先于繁殖事件的更新规则比其他规则显著降低了选择压力。
英文摘要：
Individuals of different types, may it be genetic, cultural, or else, with different levels of fitness often compete for reproduction and survival. A fitter type generally has higher chances of disseminating their copies to other individuals. The fixation probability of a single mutant type introduced in a population of wild-type individuals quantifies how likely the mutant type spreads. How much the excess fitness of the mutant type increases its fixation probability, namely, the selection pressure, is important in assessing the impact of the introduced mutant. Previous studies mostly based on undirected and unweighted contact networks of individuals showed that the selection pressure depends on the structure of networks and the rule of reproduction. Real networks underlying ecological and social interactions are usually directed or weighted. Here we examine how the selection pressure is modulated by directionality of interactions under several update rules. Our conclusions are twofold. First, directionality discounts the selection pressure for different networks and update rules. Second, given a network, the update rules in which death events precede reproduction events significantly decrease the selection pressure than the other rules.
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