斜纹夜蛾的性选择行为  

Sexual selection in Spodoptera litura Fabricius(Lepidoptera:Noctuidae)

作　　者：曾昭华[1] 杨茂发[1,2] 武承旭[1] 

机构地区：[1]贵州大学昆虫研究所,贵州省山地农业病虫害重点实验室,贵阳550025 [2]贵州大学烟草学院,贵阳550025

出　　处：《应用昆虫学报》2016年第5期1084-1090,共7页Chinese Journal of Applied Entomology

基　　金：中国烟草总公司贵州省公司2010年度科学研究与技术开发项目(201022);贵州大学大学生SRT项目(贵大SRT字2013056);贵州大学研究生创新基金(研农2014008)

摘　　要：【目的】为了解斜纹夜蛾Spodoptera litura Fabricius体重、日龄、交配经历及形态特征对其性选择行为的影响。【方法】本实验通过标记成虫后,采用观察记录的方法对其进行探究。【结果】斜纹夜蛾雌虫的体重对雄虫的性选择影响比较明显,体重较大雄虫优先选择体重较小的雌虫(71.43%),而体重较小雄虫喜欢选择体重较大的雌虫(72.00%)。体重较大和体重较小的雄虫都能获得体重较大雌虫的交配选择,但是体重较大者被选择的机会更大(70.00%),体重较小的雄虫不能获得体重较小雌虫的选择。雄虫仅选择1日龄的雌虫,而雌虫偏向选择3日龄和5日龄雄虫。交配经历影响斜纹夜蛾的性选择,未交配的雄虫优先选择未交配的雌虫(86.67%),但未交配的雌虫则优先选择已交配的雄虫(66.67%)。雄虫的形态特征(体长、翅展、腹长、复眼间距和触角长)对雌虫性选择有较明显的影响,但雌虫的形态特征除翅展的大小外,其体长、腹长、复眼间距和触角长等形态特征在雄虫选择进行交配中的作用不大。【结论】体重、日龄、交配经历及形态特征都能不同程度影响斜纹夜蛾的性选择行为。[Objectives] To understand the effect of body weight, age, mating experience and other morphological characteristics of Spodoptera litura Fabricius on mate choice and mating success. [Methods] Adults were weighed and marked so that individual mating success could be observed and recorded. [Results] The majority（71.43%） of heavier males preferred to mate with smaller females, and vice versa（72.00%）. Females mated with both heavier and lighter males, but heavier males had a greater chance（70.00%） of mating. Male S. litura only mated with one-day-old females but females preferred to mate with three, or five-day old, males. Mating experience influences sexual selection in S. litura; most（86.67%） virgin males mated with virgin females, whereas most（66.67%） virgin females mated with non-virgin males. The morphological characteristics of males had a more obvious effect on female mate choice. However, females＇ morphological characteristics, including wing size, body length, abdomen length, eye spacing and antennae length, played a minor role in influencing male choice. [Conclusion] Weight, age, mating experience, and morphological characteristics, of S. litura all influence mate choice in this species to different degrees.

关 键 词：斜纹夜蛾 性选择 体重 形态特征 日龄 

分 类 号：S433.4[农业科学—农业昆虫与害虫防治]