草地贪夜蛾抱对前配偶选择与形态学性状的关系
Relationship between pre-copulatory mate choice and morphological traits in Spodoptera frugiperda
邢怀森，余明辉，杨晓杰，张少华，赵 曼，郭线茹，原国辉，李为争
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DOI：10.7679/j.issn.2095-1353.2023.110
作者单位：河南农业大学植物保护学院，郑州 450002
中文关键词：草地贪夜蛾；配偶选择；形态；异速生长；选型交配
英文关键词：Spodoptera frugiperda; mate choice; morphology; allometric growth; assortative mating
中文摘要：
【目的】 入侵害虫草地贪夜蛾Spodoptera frugiperda 已成为我国广泛分布的常发性迁飞害虫。抱对前配偶选择行为的研究将为该害虫不育技术的防治效果提供依据。【方法】 设置2种操作性比环境 （2♀1♂，1♀2♂）研究草地贪夜蛾配偶选择与体重、体长、前翅长度和腹部宽度的关系。【结果】 雄蛾显著偏好选择体长较短的雌蛾交尾（t=3.20，P=0.006 9），相反，被雌蛾选择的雄蛾体重（t=1.49，P= 0.150 0）、前翅长度（t=0.59，P=0.557 7）、体长（t=0.43，P=0.668 8）和腹部宽度（t=0.26，P=0.795 4）均无显著差异。选型交配的首要指标是腹部宽度（r=0.59，P=0.000 1），其次是体长（r=0.36，P=0.027 1）。雄蛾存在着异速生长现象，且该现象出现在体重与其他尺寸类参数之间的两两相关分析中（体长与体重之间：r=0.07，P=0.564 7；前翅长度与体重之间：r=0.14，P=0.284 0；腹部宽度与体重之间：r=0.10，P=0.437 9）。【结论】 草地贪夜蛾雄蛾偏好与体长较短的雌蛾交尾。选型交配的最重要形态学指标是腹部宽度。
英文摘要：
[Objectives] To investigate pre-copulatory mate choice in the invasive fall armyworm, Spodoptera frugiperda, and thereby both answer some fundamental biological questions and improve the effectiveness of releasing sterile insects to control this widely distributed, migratory, insect pest. [Methods] We investigated whether several morphological traits (body weight, body length, forewing length and abdominal width) are involved in pre-copulatory mate choice under two operational sex ratios; 2♀1♂ and 1♀2♂. [Results] The body lengths of females that were preferred by males were significantly shorter than those of less preferred females (t=3.20，P=0.006 9). However, none of the four measured morphological traits differed significantly between preferred and and unpreferred males (body weight: t=1.49，P=0.150 0; forewing length: t=0.59，P=0.557; body length: t=0.43，P=0.668; abdominal width: t=0.26，P=0.795). The primary morphological trait influencing mate choice was abdominal width (r=0.59, P=0.000 1), and the next most important was body length (r=0.36, P=0.027 1). Males, but not females, exhibit allometric growth, which significantly affects the relationship between body weight and the other three morphological traits (body length vs body weight: r = 0.07, P = 0.564; forewing length vs body weight: r = 0.14, P = 0.284; abdominal width vs body weight: r = 0.10, P = 0.437). [Conclusion] Adult male S. frugiperda prefer to mate with females that have a relatively short body. The most important morphological trait influencing mate choice is abdominal width.