The effect of evolution on host-parasitoid systems.
The effect of evolution on host-parasitoid systems.
复制标题
进化对寄主-寄生系统的影响。
DOI：
10.1006/jtbi.2001.2263
复制
发表时间：
2001
影响因子：
2
通讯作者：
Y. Takeuchi
中科院分区：
文献类型：
--
作者：
R. Kon;Y. Takeuchi
众所周知，简单的一阶差分方程可以表现出复杂的总体动态，例如持续振荡和混沌。一个有趣的问题是，这种振荡动力学是否会发生在真实的群体中。本文假设驻留系统由1个寄主和1个寄生蜂组成，并且只允许寄主进化，而不允许寄生蜂进化。基于宿主对寄主-寄生系统的入侵性，我们研究了自然选择所青睐的寄主-寄生系统的动态。我们考虑两种情况。在第一种情况下，考虑了宿主的进化，涉及固有增长率和对密度的敏感性。在第二种情况下，考虑了宿主的进化，包括内在增长率和对寄生蜂的脆弱性。在这两种情况下，我们看到，如果没有允许进化的宿主特征之间的权衡，自然选择不会青睐具有稳定平衡的动态。具有稳定平衡的寄主-寄生蜂系统最终将被与寄生蜂形成不稳定平衡的寄主类型入侵。如果允许进化的宿主特征之间存在权衡，那么具有稳定平衡的宿主-寄生系统可以受到自然选择的青睐。
It is well known that a simple first-order difference equation can exhibit complex population dynamics, such as sustained oscillations and chaos. An interesting problem is whether such oscillatory dynamics are expected to occur in real populations. This paper assumes that the resident system is composed of 1-host and 1-parasitoid and that only the host is allowed to evolve, but not the parasitoid. Based on the invasibility of a host to host-parasitoid systems, we investigate the dynamics of the host-parasitoid system favored by natural selection. We consider two cases. In the first case, the host's evolution involving both the intrinsic growth rate and the sensitivity to density is considered. In the second case, the host's evolution involving both the intrinsic growth rate and the vulnerability to the parasitoid is considered. In both cases, we see that the dynamics with a stable equilibrium will not be favored by natural selection without the trade-off between the host's traits which are allowed to evolve. The host-parasitoid system with a stable equilibrium will be eventually invaded by a host type that develops an unstable equilibrium with the parasitoid. If there is a trade-off between the host's traits which are allowed to evolve, a host-parasitoid system with a stable equilibrium can be favored by natural selection.