Department of Entomology and Nematology, University of California Davis, Davis, CA.
UC Agriculture and Natural Resources, University of California Cooperative Extension & Statewide IPM Program, Modesto, CA.
Environ Entomol. 2021 Apr 23;50(2):390-398. doi: 10.1093/ee/nvaa146.
High-temperature events can influence insect population dynamics and could be especially important for predicting the potential spread and establishment of invasive insects. The interaction between temperature and environmental humidity on insect populations is not well understood but can be a key factor that determines habitat range and population size. The brown marmorated stink bug, Halyomorpha halys (Stål), is an invasive agricultural pest in the United States and Europe, which causes serious economic damage to a wide range of crops. This insect's range continues to expand. It has recently invaded the Central Valley of California, which has a hotter and drier climate compared with the Eastern United States where this insect is established. We investigated how high-temperature events and relative humidity would impact the survival and reproduction of H. halys. Using incubators and humidity chambers, we evaluated the impact of humidity and short-term (2 d) high-temperature exposure on the survival and development of H. halys eggs, nymphs, and adults. We found that high temperatures significantly reduced H. halys survival. The impact of humidity on H. halys survival was dependent on temperature and life stage. Low humidity decreased first-instar survival but not third- to fourth-instar survival. High humidity increased first instar survival but decreased third- to fourth-instar survival. Humidity did not influence adult or egg survival. We also found that high temperatures decreased H. halys reproduction. Our findings have important implications for understanding the invasive ecology of H. halys and may be used to improve models predicting H. halys range expansion.
高温事件会影响昆虫种群动态，对于预测入侵昆虫的潜在传播和定殖尤其重要。温度和环境湿度对昆虫种群的相互作用还不太清楚，但可能是决定栖息地范围和种群大小的关键因素。褐带斑蝽（Halyomorpha halys (Stål)）是美国和欧洲一种具有入侵性的农业害虫，它会对广泛的农作物造成严重的经济损失。这种昆虫的分布范围还在继续扩大。它最近入侵了加利福尼亚州的中央山谷，那里的气候比褐带斑蝽已经建立种群的美国东部更热、更干燥。我们研究了高温事件和相对湿度如何影响褐带斑蝽的生存和繁殖。我们使用孵育器和湿度室，评估了湿度和短期（2 天）高温暴露对褐带斑蝽卵、若虫和成虫生存和发育的影响。我们发现高温显著降低了褐带斑蝽的存活率。湿度对褐带斑蝽存活率的影响取决于温度和生命阶段。低湿度会降低第一龄若虫的存活率，但不会降低第三至第四龄若虫的存活率。高湿度会增加第一龄若虫的存活率，但会降低第三至第四龄若虫的存活率。湿度对成虫和卵的存活率没有影响。我们还发现高温会降低褐带斑蝽的繁殖力。我们的研究结果对于理解褐带斑蝽的入侵生态学具有重要意义，并可用于改进预测褐带斑蝽分布范围扩大的模型。
