Colonization and speciation mechanisms of an invading insect pest

美国白蛾在北美洲有一个近亲种。我们研究了物种的形成模式和全球变暖对生活史适应的影响，这是殖民物种在殖民后面临和经历的两个方面，即竞争和对沿海气候条件的适应。结果表明，这两个近缘种是不同的物种，其生殖隔离受昼夜节律和季节生活史分化的影响。从二化性/三化性生命周期的转变每年稳步向北移动，可能是受到全球变暖的推动。

Hyphantria cunea has a sibling species in the North America. We investigated the mode of speciation and the effect of global warming on the life cycle adaptation, the two aspects that colonizing species faces and undergoes adaptation after colonization, i.e., competition and adaptation to lacal climatic condition. The results suggest that the two sibling species are distinct species and the reproductive isolation is effected by differentiation in circadian clock and seasonal life cycle. The transition from bivoltine/trivoltine life cycle steadily moves northerly year by year, probably pushed by global warming.