Changes to the fire regime in boreal Alaska are shifting the ratio of coniferous to deciduous dominance on the landscape. The increase in aspen and birch may have important effects on predatory hymenopteran assemblages by providing a source of extrafloral nectar and increasing prey availability. Furthermore, fire-induced changes in successional age alter habitat structure and microclimate in ways that may favor ants. This study is the first to characterize the influence of fire-related vegetation changes on boreal predatory hymenopteran assemblages. We compare the abundance, species richness, and composition of predatory hymenopteran assemblages among forests at different stages of succession and of varying post-fire tree species compositions. Ant assemblages were weakly related to forest composition, but ants were significantly more abundant and speciose in early-successional forests than in mid-late successional forests. In contrast, macropterous wasp morphospecies richness and abundance, and micropterous wasp abundance, were positively related to the basal area of aspen, but were not related to successional stage. The results suggest that shifts in boreal vegetation related to climate warming will result in changes to the predaceous insect community, with ants responding positively to disturbance and wasps responding positively to an increase in the representation of aspen on the landscape.

阿拉斯加北部火势的变化正在改变针叶林与落叶林优势地位的比例。白杨和桦树的增加可能通过提供花外花蜜的来源和增加猎物的可利用性而对掠食性膜翅类动物组合产生重要影响。此外，火灾引起的继承年龄变化会以有利于蚂蚁的方式改变栖息地的结构和微气候。这项研究是第一个表征与火有关的植被变化对北方捕食性膜翅目昆虫组合的影响的研究。我们比较了森林在演替的不同阶段和火后树种组成的不同阶段之间掠食性膜翅类动物种群的丰度，物种丰富度和组成。蚂蚁组合与森林组成之间的关系微弱，但是，相比于中晚期演替森林，早期成功森林中的蚂蚁明显更加丰富和特殊。相比之下，大型黄蜂的形态形态丰富度和丰富度，以及微型黄蜂的丰度与白杨的基面积成正相关，而与演替阶段无关。结果表明，与气候变暖有关的北方植被的变化将导致早熟昆虫群落的变化，蚂蚁对干扰产生积极的响应，而黄蜂对景观中白杨的数量增加则产生积极的响应。但与演替阶段无关。结果表明，与气候变暖有关的北方植被的变化将导致早熟昆虫群落的变化，蚂蚁对干扰产生积极的响应，而黄蜂对景观中白杨的数量增加则产生积极的响应。但与演替阶段无关。结果表明，与气候变暖有关的北方植被的变化将导致早熟昆虫群落的变化，蚂蚁对干扰产生积极的响应，而黄蜂对景观中白杨的数量增加则产生积极的响应。