Data from: 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 to be effective across large geographic areas based on the absence of fine-scale genetic structure.

若要高效管控诸如山松大小蠹（Dendroctonus ponderosae, mountain pine beetle）这类森林害虫，需先明确其交配系统与精细尺度空间遗传结构。本研究利用全基因组单核苷酸多态性（single-nucleotide polymorphisms, SNP），对加拿大阿尔伯塔省某单一林分采集的山松大小蠹样本的精细尺度遗传结构与交配系统进行评估。该林分内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。亲缘关系估算结果支持此前关于羽化前交配的研究报道。亲本归属分析表明，相较于此前报道的雌性单配制/雄性多配制系统，多配交配系统更能解释单个虫道内个体间的亲缘关系。此外，有证据表明，至少在种群暴发条件下，雌性个体可能会侵占其他雌性的虫道。基于该林分不存在精细尺度空间遗传结构的结论，本研究表明现有管控模型在大范围地理区域内或同样适用。