While many bumblebee species decline due to climate and land-use changes, others cope well with contemporary conditions. One example is Bombus terrestris, which is common in intensively managed agricultural landscapes. During the 20th century its subgenus, which includes the B. lucorum complex (B. lucorum, B. cryptarum and B. magnus) came to dominate Scandinavian bumblebee communities, but the specific contribution of B. terrestris remains to be understood. Using historical data on males, we assessed how the relative abundances of B. terrestris and the B. lucorum complex changed over the past 150 years in southernmost Sweden. We tested if these changes differed between simplified and mixed landscapes and whether the relative abundance of B. terrestris was related to annual mean temperatures. Because floral availability has advanced as a response to climate change, we also tested if the activity period of males (estimated as catching date) has advanced and whether the advancement differs between taxa. The relative abundance of B. terrestris increased similarly in both landscapes, from 21% to 79% over the period, and this was largely explained by increasing temperature. Male activity period has advanced similarly in the two taxa, with 41 days between 1900 and 2015. Although the dominance of B. terrestris correlates clearly with annual mean temperature, it remains to disentangle why. It also remains to understand whether the success of B. terrestris occurs at the expense of other species or simply reflects that this species copes better with contemporary conditions.

尽管许多大黄蜂物种由于气候和土地利用的变化而减少，但其他大黄蜂物种却能很好地应对当代情况。一个例子是熊熊m，在集约化管理的农业景观中很常见。在20世纪，它的亚属（包括B. lucorum复合体（B. lucorum，B。cryptarum和B. magnus））在斯堪的纳维亚大黄蜂群落中占主导地位，但是陆生B. terrestris的具体贡献仍有待了解。在男性使用历史数据，我们如何评估的相对丰度B.蒺藜和B.蝽在过去150年来，瑞典最南端的建筑群发生了变化。我们测试了这些变化在简化景观和混合景观之间是否有所不同，以及陆地白僵菌的相对丰度是否与年平均温度有关。由于花的可利用性已随着对气候变化的响应而提前，因此我们还测试了雄性的活动期（估计为捕获日期）是否已提前，以及两类之间的进展是否有所不同。在这两个景观中，陆地藜的相对丰度相似地增加，从21％增加到79％，这在很大程度上是由于温度升高所致。在两个分类群中，男性活动期也有类似的发展，在1900年至2015年之间为41天。与年平均温度有明显的相关性，为什么还有待弄清。还需要了解，陆地白僵菌的成功是以其他物种为代价发生的，还是仅仅反映出该物种在当代条件下能更好地应对。