Abstract

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.

中文翻译：

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温度和湿度相互影响，影响了棕St臭虫（半翅目：P科）的存活率

摘要

高温事件会影响昆虫的种群动态，对于预测潜在的入侵性昆虫传播和建立特别重要。温度和环境湿度在昆虫种群上的相互作用尚不清楚，但可能是决定栖息地范围和种群规模的关键因素。棕色的臭臭臭虫，Halyomorpha halys（Stål）是美国和欧洲的一种入侵性农业害虫，对多种农作物造成了严重的经济损失。这种昆虫的范围不断扩大。它最近入侵了加利福尼亚中部山谷，与建立这种昆虫的美国东部相比，这里的气候更热更干燥。我们调查了高温事件和相对湿度如何影响H. halys的存活和繁殖。我们使用孵化器和湿度箱，评估了湿度和短期（2天）高温暴露对H. halys卵，若虫和成虫的存活和发育的影响。我们发现高温显着降低了H. halys的存活率。湿度对H. halys的存活取决于温度和生命阶段。低湿度会降低第一龄的存活率，但不会降低第三龄至第四龄的存活率。高湿度增加了第一龄幼虫的存活率，但降低了第三龄至第四龄幼虫的存活率。湿度不影响成虫或卵的存活。我们还发现高温降低了H. halys的繁殖。我们的发现对理解H. halys的入侵生态学具有重要意义，并可用于改进预测H. halys范围扩展的模型。