Polygamy and an absence of fine-scale structure in Dendroctonus ponderosae (Hopk.) (Coleoptera: Curcilionidae) confirmed using molecular markers

An understanding of mating systems and fine-scale spatial genetic structure is required to effectively manage forest pest species such as Dendroctonus ponderosae (mountain pine beetle). Here we used genome-wide single-nucleotide polymorphisms to assess the fine-scale genetic structure and mating system of D. ponderosae collected from a single stand in Alberta, Canada. Fine-scale spatial genetic structure was absent within the stand and the majority of genetic variation was best explained at the individual level. Relatedness estimates support previous reports of pre-emergence mating. Parentage assignment tests indicate that a polygamous mating system better explains the relationships among individuals within a gallery than the previously reported female monogamous/male polygynous system. Furthermore, there is some evidence to suggest that females may exploit the galleries of other females, at least under epidemic conditions. Our results suggest that current management models are likely t...

为有效防控森林害虫物种（如山松大小蠹（Dendroctonus ponderosae）），需先明确其交配系统与精细尺度空间遗传结构。本研究采用全基因组单核苷酸多态性（single-nucleotide polymorphisms, SNP）技术，对采自加拿大阿尔伯塔省单一林分的山松大小蠹开展精细尺度遗传结构与交配系统分析。结果显示，该林分内部未检测到精细尺度空间遗传结构，绝大多数遗传变异可通过个体水平得到最优解释。亲缘关系估计结果支持此前关于羽化前交配的研究报道。亲权指派分析表明，相较于此前提出的雌性单配制、雄性多配制系统，多配制交配模式更能合理阐释坑道内个体间的亲缘关系。此外，现有证据显示，至少在种群流行暴发条件下，雌性个体可能会侵占其他雌性的坑道。本研究结果表明，当前的害虫防控模型或许...