Niche width and interspecific competition of wheat aphids Rhopalosiphum padi and Sitobion avenae are increased by simulated warming

文献类型： 外文期刊

第一作者： Li, Wei-Wei

作者： Li, Wei-Wei;Yan, Jia;Yang, Jiaqi;Zhang, Yunhui;Tan, Xiao-Ling;Tan, Xiao-Ling

作者机构：

关键词： climate warming; global change; population dynamics; niche competition; life table

期刊名称：ENTOMOLOGIA GENERALIS （ 影响因子：4.6； 五年影响因子：4.4 ）

ISSN： 0171-8177

年卷期： 2024 年 45 卷 1 期

页码：

收录情况： SCI

摘要： Climate warming exacerbates yield losses due to crop pests, but its influence on the distribution of Rhopalosiphum padi and Sitobion avenae, and consequent changes in their interspecific competition within multi-pest systems in wheat fields, remains poorly known. This study examined the impact of a 2 degrees C increase from 19 to 21 degrees C on the life table of two major aphid pests during wheat heading stage, the number of winged aphids, population dynamics in single- versus mixed- (interspecific competition) species systems, as well as their niche breadth (Bn) and niche overlap (LO) were analyzed. Results revealed that the warming increased the intrinsic rate of increase (rm) of both aphids in the lower leaves, while shortened the nymphal developmental period of both aphids. Additionally, R. padi exhibited higher rm compared to S. avenae. Warming significantly increased the abundance of both aphids but decreased the proportion of winged aphids. Moreover, Bn and LO increased when two aphids coexisted, which especially exacerbated competition in upper leaves of the wheat. The lower temperature favored the growth of S. avenae in the mix population. This advantage disappears when in the higher temperature. Consequently, warming promotes the population growth of both aphids, leading to their overlapping presence in the upper leaf of wheat and escalating interspecific competition. Under elevated temperatures, R. padi emerged as the more dominant species in mixed populations, emphasizing the significance of enhancing control measures against R. padi to guarantee high quality wheat yield in the future.

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