Kuramitsu Kazumu, Yooboon Thitaree, Tomatsuri Morihiko, Yamada Hideo, Yokoi Tomoyuki
Laboratory of Conservation Ecology, Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8572, Japan.
Laboratory of Applied Entomology and Zoology, Graduate School of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8572, Japan.
Naturwissenschaften. 2019 May 8;106(5-6):23. doi: 10.1007/s00114-019-1616-y.
Precopulatory mate-guarding behavior is a common strategy that maximizes male reproductive success when female receptivity to copulation is low. This behavior has been demonstrated in vertebrates, aquatic crustaceans, terrestrial isopods, and some species of insects, but there is very little available information about hymenopteran insects. A few studies have clarified the factor that determines the outcome of a contest between a guarding male and an invader male. We investigated the male-male contest and mating behavior of a saproxylic parasitoid wasp, Ibalia japonica (Hymenoptera: Cynipoidea: Ibaliidae) using field observations in Japan. These observations indicated that I. japonica males show precopulatory mate-guarding behavior and that four types of male-male contests occur on the Magnolia liliiflora (Magnoliales: Magnoliaceae) tree that virgin females emerge from. We show that the arrival order of I. japonica males that found the future emergence point of a female was key factor that allowed males to secure virgin females.
交配前的配偶守卫行为是一种常见策略，当雌性对交配的接受度较低时，这种行为能使雄性的繁殖成功率最大化。这种行为在脊椎动物、水生甲壳类动物、陆生等足类动物以及一些昆虫物种中都有体现，但关于膜翅目昆虫的相关信息却非常少。一些研究已经阐明了决定守卫雄性与入侵雄性之间竞争结果的因素。我们利用在日本进行的野外观察，研究了一种蛀干寄生蜂——日本伊霸鹩蜂（膜翅目：瘿蜂总科：伊霸鹩蜂科）的雄雄竞争和交配行为。这些观察表明，日本伊霸鹩蜂的雄性表现出交配前的配偶守卫行为，并且在处女雌蜂羽化而出的紫玉兰（木兰目：木兰科）树上会发生四种类型的雄雄竞争。我们发现，找到雌性未来羽化点的日本伊霸鹩蜂雄性的到达顺序是雄性确保获得处女雌蜂的关键因素。
