The invasion and coexistence of competing Wolbachia strains
The invasion and coexistence of competing Wolbachia strains
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DOI：
10.1038/sj.hdy.6800343
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发表时间：
2003-10-01
期刊：
影响因子：
3.8
通讯作者：
Read, JM
中科院分区：
文献类型：
--
作者：
Keeling, MJ;Jiggins, FM;Read, JM
被不同菌株的Wolbachia感染的节肢动物之间的细胞质不相容性已被提出作为物种形成的重要机制。然而，这一机制的一个基本要求是相邻种群中不同菌株的共存。在这里，我们测试是否需要共存是可能的空间环境中。一个和两个菌株的沃尔巴克氏体在一个单一的良好混合人口的行为的连续时间模型证明了阿利效应和创始人控制，这样一个菌株总是被驱动灭绝。与此相反，离散空间模型显示斑块持久性的两种菌株，虽然在同一栖息地共存是罕见的。这种创始人控制的一个简化模型表明，导致持久性的是栖息地的碎片化（或障碍），而不是空间本身。
Cytoplasmic incompatibility between arthropods infected with different strains of Wolbachia has been proposed as an important mechanism for speciation. However, a basic requirement for this mechanism is the coexistence of different strains in neighbouring populations. Here we test whether this required coexistence is possible in a spatial context. Continuous-time models for the behaviour of one and two strains of Wolbachia within a single well-mixed population demonstrate the Allee effect and founder control, such that one strain is always driven extinct. In contrast, discretised spatial models show patchy persistence of the two strains although coexistence within the same habitat is rare. A simplified model of such founder control suggests that it is fragmentation of (or barriers within) the habitat rather than space itself that leads to persistence.