Invasive plants are a novel resource for the resident pollinator community, but may not be able to successfully attract pollinators if they have a specialized pollination system or restrictive floral morphology. Pollinator limitation may limit invasion success, but a plant able to attract many pollinators in different conditions will be a successful invasive species. In this study, we measured the pollinator community by capturing pollinators at several timepoints during the flowering season. Captures were made at six field sites along an elevation gradient. Measurements were specific to an invasive shrub with very low self-compatibility and a restrictive floral morphology, Cytisus scoparius (Scotch broom). We found that the pollinator community varies along an elevation gradient, having more Apis mellifera at low elevation sites and more Bombus spp., especially Bombus sitkensis at higher elevations. We saw different higher pollination rates, but lower seed set at higher elevation sites. Although C. scoparius has been able to attract a variety of pollinators, pollen robbing by one species may result in decreased plant fitness.

中文翻译：

---

传粉昆虫群落在海拔梯度上探访入侵的Cytisus scoparius L. Link（Fabaceae）的变化

入侵植物是常驻授粉媒介社区的一种新颖资源，但如果它们具有专门的授粉系统或限制性花的形态，可能无法成功吸引授粉媒介。授粉媒介的限制可能会限制入侵的成功，但是能够在不同条件下吸引许多传粉媒介的植物将是成功的入侵物种。在这项研究中，我们通过在开花季节的多个时间点捕获传粉媒介来测量传粉媒介群落。沿海拔梯度在六个野外地点进行了捕获。测量是针对具有非常低的自我适应性和限制性花形态的侵袭性灌木Cytisus scoparius（苏格兰扫帚）进行的。我们发现授粉媒介群落沿海拔梯度变化，具有更多蜜蜂在低海拔地区和更多的熊蜂物种中，特别是在高海拔的熊蜂西提克。我们看到了不同的较高的授粉率，但是在较高海拔的地方结实率较低。尽管C. scoparius能够吸引各种传粉媒介，但抢劫一种花粉可能会导致植物适应性下降。