Directionality of contact networks suppresses selection pressure in evolutionary dynamics

JOURNAL OF THEORETICAL BIOLOGY

卷:258

Article

Masuda, Naoki^1,2 

[1] Univ Tokyo, Grad Sch Informat Sci & Technol, Bunkyo Ku, Tokyo 1138656, Japan

[2] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

关键词: Fixation probability;    Directed networks;    Population dynamics;   

DOI  :  10.1016/j.jtbi.2009.01.025

来源: Elsevier

【 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 Oil 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. (C) 2008 Elsevier Ltd. All rights reserved.

【 授权许可】

Free