The Sex Ratio Indicates the Conclusion and Onset of Population Cycles in the Beet Webworm Loxostege sticticalis L. (Lepidoptera: Pyralidae)

文献类型： 外文期刊

第一作者： Cheng, Yunxia

作者： Cheng, Yunxia;Hu, Min;Luo, Lizhi;Jiang, Xingfu;Kang, Aiguo;Xiao, Yonghong

作者机构：

关键词： beet webworm; Loxostege sticticalis; sex ratio; mating frequency; population dynamics

期刊名称：INSECTS （ 影响因子：3.0； 五年影响因子：3.1 ）

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年卷期： 2023 年 14 卷 10 期

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收录情况： SCI

摘要： Beet webworms, Loxostege sticticalis L. (Lepidoptera: Pyralidae), are one of the most destructive pest insects in northern China, and their populations outbreak periodically. Developing an indicator that defines the ending and beginning of the occurrence period cycle is urgent for the population forecast and theoretical study. The sex ratio can be a primary pathway through which species regulate population size. We measured the maximum mating potential of both females and males and the population net reproductive rate under different sex ratios (e.g., 3:1, 2:1, 1:1, 1:2, 1:3). The maximum mating frequency of males was 2.91 times that of females. The progeny contribution per mating decreased with increased mating times in males. The variation in population net reproductive rate affected by the sex ratio fits the parabolic curve analysis and peaked at 1.82 for females vs. males. Our results illustrate the quantitative connection phenomenon shown by the historical data: population outbreaks occur at a sex ratio of two or more and collapse at a sex rate lower than one. Simultaneously, the sex ratio may be utilized as a definite indicator for the beginning and end of the future occurrence cycle in the beet webworm.

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