McLeod David V, Day Troy
Department of Mathematics and Statistics, Queen's University, 99 University Ave Kingston, Ontario, Canada K7L 3N6
Department of Mathematics and Statistics, Queen's University, 99 University Ave Kingston, Ontario, Canada K7L 3N6.
Proc Biol Sci. 2014 Dec 7;281(1796):20141726. doi: 10.1098/rspb.2014.1726.
The selective forces shaping mating systems have long been of interest to biologists. One particular selective pressure that has received comparatively little attention is sexually transmitted infections (STIs). While it has been hypothesized that STIs could drive the evolutionary emergence of monogamy, there is little theoretical support. Here we use an evolutionary invasion analysis to determine what aspects of pathogen virulence and transmission are necessary for serial monogamy to evolve in a promiscuous population. We derive a biologically intuitive invasion condition in terms of population-specific quantities. From this condition, we obtain two main results. First, when pathogen virulence causes mortality rather than sterility, monogamy is more likely to evolve. Second, we find that at intermediate pathogen transmission rates, monogamy is the most selectively advantageous, whereas at high- and low-transmission rates, monogamy is generally selected against. As a result, it is possible for a pathogen to be highly virulent, yet for promiscuity to persist.
长期以来，塑造交配系统的选择力一直是生物学家感兴趣的内容。一种相对较少受到关注的特定选择压力是性传播感染（STIs）。虽然有人推测性传播感染可能推动一夫一妻制的进化出现，但理论支持很少。在这里，我们使用进化入侵分析来确定病原体毒力和传播的哪些方面是杂乱交配的种群中连续一夫一妻制进化所必需的。我们根据种群特定数量得出了一个生物学上直观的入侵条件。从这个条件出发，我们得到两个主要结果。第一，当病原体毒力导致死亡而非不育时，一夫一妻制更有可能进化。第二，我们发现，在病原体传播率中等时，一夫一妻制在选择上最具优势，而在高传播率和低传播率时，一夫一妻制通常会被选择淘汰。因此，病原体有可能具有高毒力，但杂乱交配仍会持续存在。
