Centro de Estudos Florestais, Instituto Superior de Agronomia, Technical University of Lisbon, Lisboa, Portugal.
J Evol Biol. 2011 Jan;24(1):146-58. doi: 10.1111/j.1420-9101.2010.02147.x. Epub 2010 Oct 21.
A plausible case of allochronic differentiation, where barrier to gene flow is primarily attributable to a phenological shift, was recently discovered in Portugal for the pine processionary moth Thaumetopoea pityocampa. Previous results suggested that the observed 'summer population' (SP) originated from the sympatric winter population (WP). Our objectives were to finely analyse these patterns and test their stability in time, through field monitoring and genetic analyses of larvae and adults across different years. Reproductive activity never overlapped between SP and WP. Microsatellites showed a clear differentiation of the SP, consistent with a strong reduction in gene flow owing to the phenological shift. Assignment tests suggested that some individuals shift from the SP to the WP phenology, causing some hybridization. We discuss these patterns and their maintenance over time. This could be a first stage of allochronic speciation, and SP should be considered as a distinct phenological race.
最近在葡萄牙发现了一个合理的异步分化案例，其中基因流动的障碍主要归因于物候变化。对于松毛虫 Thaumetopoea pityocampa 来说，此前的研究结果表明，观察到的“夏季种群”（SP）起源于同域的冬季种群（WP）。我们的目标是通过对不同年份的幼虫和成虫进行实地监测和遗传分析，精细分析这些模式及其随时间的稳定性。SP 和 WP 之间的繁殖活动从未重叠。微卫星显示 SP 有明显的分化，这与由于物候变化导致的基因流明显减少是一致的。分配测试表明，一些个体从 SP 向 WP 物候转变，导致一些杂交。我们讨论了这些模式及其随时间的维持。这可能是异步物种形成的第一阶段，SP 应被视为一个独特的物候种。
