Abstract Insect pollinators are declining, which often is related to intensified agriculture. Less focus has been on the effect of forestry. In many boreal forests, clear-cutting has replaced fire as the main disturbance agent, which has been negative for many species. Therefore, prescribed burning is performed, often on clear-cuts. Knowledge on the effect of fire on pollinators is, however, scarce. We sampled pollinators and their resources in 22 burned and 15 unburned clear-cuts in and around a large wildfire area in Sweden, three years after fire. We compared potential pollinator resources as well as richness, abundance and community composition of four groups of pollinators: bees (totaling 583 individuals), wasps (1226), hoverflies (416), and butterflies (7 2 8) between burned and unburned clear-cuts. Moreover, we analyzed the effect of burn severity (depth of remaining humus). We show that the diversity and cover of potential nectar/pollen plants were clearly lower in burned clear-cuts, while potential nesting resources were higher. Butterfly richness was 67% lower and abundance 89% lower in burned clear-cuts. Differences in richness and abundance were smaller for bees, wasps, and hoverflies, but their species composition differed. We found no effect of burn severity on pollinators or their resources. We conclude that burned clear-cuts have fewer pollinators three years after fire, which is driven by a loss of butterflies. However, changes in species composition from clear-cut fires could complement the fauna of unburned sites when mixed at landscape level. Future studies should follow vegetation and pollinator communities over longer time periods following clear-cut burning.

中文翻译：

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与未燃烧的净地相比，最近燃烧的蝴蝶数量减少，蜜蜂、黄蜂和食蚜蝇的成分不同，无论燃烧的严重程度如何

摘要 昆虫传粉者正在减少，这通常与集约化农业有关。较少关注林业的影响。在许多北方森林中，砍伐已取代火成为主要干扰因素，这对许多物种不利。因此，执行规定的燃烧，通常是在干净的地方。然而，关于火对传粉媒介的影响的知识很少。火灾发生三年后，我们在瑞典一个大型野火区及其周围的 22 处已燃烧和 15 处未燃烧的林地中采样了传粉媒介及其资源。我们比较了四组传粉媒介的潜在传粉媒介资源以及丰富度、丰度和群落组成：蜜蜂（总共 583 只）、黄蜂（1226 只）、食蚜蝇（416 只）和蝴蝶（7 2 8 只）在燃烧和未燃烧的清除之间。削减。而且，我们分析了烧伤严重程度（剩余腐殖质的深度）的影响。我们表明，在燃烧的林地中，潜在的花蜜/花粉植物的多样性和覆盖率明显较低，而潜在的筑巢资源则较高。在已烧毁的林地中，蝴蝶丰富度降低了 67%，丰度降低了 89%。蜜蜂、黄蜂和食蚜蝇的丰富度和丰度差异较小，但它们的物种组成不同。我们发现烧伤严重程度对传粉媒介或其资源没有影响。我们得出的结论是，火灾发生三年后，被烧毁的林地的传粉媒介减少了，这是由蝴蝶的损失造成的。然而，当在景观层面混合时，明火造成的物种组成变化可以补充未燃烧地点的动物群。