Increased fire frequency is predicted in global forests over the 21st century owing to climate change. Fire–averse animals are expected to be negatively impacted by frequent wildfire events, or corresponding habitat alteration and reduction in the extent of long unburnt forest in landscapes. Mobility is an attribute that may enable bird species persistence in this context, but the capacity to move varies among species. Our aim was to determine whether birds with similar movement strategies, i.e. groups of sedentary, migratory and nomadic species, have similar patterns of occurrence in relation to forest fire frequency and long unburnt forest in the landscape. We modelled occupancy of avian movement groups and species in austral temperate forests in relation to fire frequency in forest patches and the presence/absence of long unburnt forest in the landscape surrounding each patch. We also evaluated relationships between species body size and responses to fire, because larger species tend to disperse further and have larger territories. Migrants responded positively at the group level to the presence of long unburnt forest in the landscape. No other consistent responses of movement groups to fire were detected, although foraging or nesting niche overlaps were evident among species that responded similarly to fire within groups. Of the 20% of 74 total species that responded to one or both fire history predictors, there were twice as many mobile species (migrants, nomads) than sedentary species. Positive responses to the presence of long unburnt forest were dominated by migrants and were much stronger than positive or negative responses to fire frequency. No species was more likely to occur when long unburnt forest was absent from the landscape. Species that responded to fire were large (median body mass 243 g) compared with those that did not respond (median 23 g). Our structured approach to investigating how avian movement capacity and propensity influences occurrence in relation to fire frequency has increased understanding of the mechanisms that enable avian persistence in fire-prone forests. Many large, mobile bird species can and do move at landscape scales to use resources that may be affected by fire frequency, particularly those that are embodied in long unburnt forest.

由于气候变化，预计 21 世纪全球森林火灾频率将增加。预计不喜欢火的动物会受到频繁的野火事件或相应的栖息地改变和景观中长期未烧毁森林范围的减少的负面影响。在这种情况下，移动性是一种可以使鸟类持久存在的属性，但移动能力因物种而异。我们的目的是确定具有相似运动策略的鸟类，即久坐、迁徙和游牧物种的群体，在森林火灾频率和景观中长期未烧毁的森林方面是否具有相似的发生模式。我们模拟了南方温带森林中鸟类运动群体和物种的占有率与森林斑块中的火灾频率以及每个斑块周围景观中长期未燃烧森林的存在/不存在之间的关系。我们还评估了物种体型与对火的反应之间的关系，因为较大的物种往往分散得更远并拥有更大的领土。移民在群体层面对景观中长期未烧毁的森林的存在做出了积极的回应。没有检测到其他运动群体对火的一致反应，尽管觅食或筑巢生态位重叠在群体内对火有类似反应的物种中很明显。在对一个或两个火灾历史预测因子做出反应的 74 种总物种中，有 20% 的物种（迁徙、游牧）是定居物种的两倍。对长期未燃烧森林存在的积极反应主要是移民，并且比对火灾频率的积极或消极反应强烈。当景观中没有长期未烧毁的森林时，没有物种更有可能出现。与没有反应的物种（中位数 23 克）相比，对火有反应的物种较大（体重中位数为 243 克）。我们研究鸟类运动能力和倾向如何影响与火灾频率相关的发生的结构化方法增加了对鸟类在易发生火灾的森林中持续存在的机制的理解。许多大型移动鸟类可以并且确实在景观范围内移动以使用可能受火灾频率影响的资源，特别是那些体现在长期未烧毁森林中的资源。