Laboratory of Insect Ecology, Faculty of Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu, 501-1193, Japan.
Department of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan.
Naturwissenschaften. 2024 May 23;111(3):31. doi: 10.1007/s00114-024-01917-5.
In social hymenopterans, monandry of the queen is an ancestral trait, and polyandry is a derived trait. Polyandry of the queen is the norm in a limited number of lineages, such as honeybees, leaf-cutting ants, Pogonomyrmex ants, and Vespula wasps, which presumably provide fitness advantages for the whole colony. The queen of the introduced bumblebee, Bombus terrestris, is polyandrous in Japan, whereas it is monandrous in native regions. We hypothesize that polyandry can evolve in a process that avoids the negative impacts of reproductive interference caused by interspecific mating and conducted genetic studies of the invasive species B. terrestris and two native subspecies, Bombus hypocrita sapporoensis and Bombus hypocrita hypocrita, in Japan. Our results revealed that although the native queens of B. hypocrita hypocrita allopatric with B. terrestris were strictly monandrous, the native queens of B. hypocrita sapporoensis sympatric with B. terrestris were polyandrous. These results suggested that the queens of native B. hypocrita sapporoensis do not experience negative impacts on interspecific mating from the invasive B. terrestris. We discuss the possibility that reproductive interference is a driving force in selection for multiple mating through an arms race between sympatric species.
在社会性膜翅目昆虫中，蚁后单性生殖是一个祖征，而多性生殖是一个衍生特征。蚁后多性生殖是少数几个谱系中的常态，如蜜蜂、切叶蚁、Pogonomyrmex 蚁和 Vespula 黄蜂，这些特征可能为整个群体提供了适应优势。引入的熊蜂 Bombus terrestris 的蚁后在日本是多性生殖的，而在其原生地区则是单性生殖的。我们假设多性生殖可以通过避免种间交配引起的生殖干扰的负面影响来进化，并对入侵物种 B. terrestris 和两个本地亚种，Bombus hypocrita sapporoensis 和 Bombus hypocrita hypocrita，在日本进行了遗传研究。我们的结果表明，尽管与 B. terrestris 地理隔离的本地 B. hypocrita hypocrita 的蚁后都是严格的单性生殖，但与 B. terrestris 同域分布的本地 B. hypocrita sapporoensis 的蚁后是多性生殖的。这些结果表明，本地 B. hypocrita sapporoensis 的蚁后不会受到入侵的 B. terrestris 对种间交配的负面影响。我们讨论了生殖干扰可能是通过同域物种之间的军备竞赛选择多配偶的驱动力的可能性。
