Lively Curtis M, Wade Michael J
Department of Biology Indiana University Bloomington Indiana USA.
Ecol Evol. 2022 Jul 31;12(8):e9136. doi: 10.1002/ece3.9136. eCollection 2022 Aug.
George Price showed how the effects of natural selection and environmental change could be mathematically partitioned. This partitioning may be especially useful for understanding host-parasite coevolution, where each species represents the environment for the other species. Here, we use coupled Price equations to study this kind of antagonistic coevolution. We made the common assumption that parasites must genetically match their host's genotype to avoid detection by the host's self/nonself recognition system, but we allowed for the possibility that non-matching parasites have some fitness. Our results show how natural selection on one species results in environmental change for the other species. Numerical iterations of the model show that these environmental changes can periodically exceed the changes in mean fitness due to natural selection, as suggested by R.A. Fisher. Taken together, the results give an algebraic dissection of the eco-evolutionary feedbacks created during host-parasite coevolution.
乔治·普赖斯展示了如何从数学上划分自然选择和环境变化的影响。这种划分对于理解宿主 - 寄生虫协同进化可能特别有用，在这种协同进化中，每个物种都代表着另一个物种的环境。在这里，我们使用耦合的普赖斯方程来研究这种对抗性协同进化。我们做出了一个常见的假设，即寄生虫必须在基因上与宿主的基因型匹配，以避免被宿主的自我/非自我识别系统检测到，但我们也考虑了不匹配的寄生虫具有一定适应性的可能性。我们的结果表明一个物种的自然选择如何导致另一个物种的环境变化。该模型的数值迭代表明，正如R.A.费希尔所指出的，这些环境变化可能会周期性地超过自然选择导致的平均适应性变化。综合来看，这些结果对宿主 - 寄生虫协同进化过程中产生的生态 - 进化反馈进行了代数剖析。
