Urbanisation is a prominent and increasing form of land-use change, with the potential to disrupt the interactions between pollinators such as bees and the flowering plants that they visit. This in turn may cause cascading local extinctions and have consequences for pollination services. Network approaches go beyond simple metrics of abundance and species richness, enabling understanding of how the structure of plant-pollinator communities are affected by urbanisation. Here we compared pollination networks between native vegetation (bushland) remnants and residential gardens in the urbanised region of the southwest Australian biodiversity hotspot. Across fourteen sites, seven per habitat, plant-bee visitor networks were created from surveys conducted monthly during the spring-summer period over two years. Extinction slope (a measure of how extinctions cascade through the network), and network robustness and nestedness were higher for bushland remnants, suggesting that networks in bushland remnants had greater functional integrity, but if disrupted, more cascading extinctions could occur. In contrast, niche overlap between pollinators was higher in residential gardens, suggesting greater competition for resources. Most species-level properties did not differ between habitats, except for normalised degree, which was higher in bushland remnants. In conclusion, it appears that pollination networks in managed residential gardens are not structurally equivalent with those in bushland remnants. This has implications for conservation of wild bee assemblages in this biodiversity hotspot, and suggests removal of remnant native vegetation for residential development could disrupt the integrity of plant-pollinator assemblages.

城市化是一种突出的且日益增加的土地利用变化形式，它有可能破坏授粉媒介（如蜜蜂）与他们所访问的开花植物之间的相互作用。反过来，这可能会导致局部灭绝，并给授粉服务带来后果。网络方法超越了简单的丰度和物种丰富度指标，使人们能够理解植物授粉群落的结构如何受到城市化的影响。在这里，我们比较了澳大利亚西南部生物多样性热点城市化地区的原生植被（灌木丛）残留物和居住花园之间的授粉网络。在14个站点中，每个栖息地有7个植物蜜蜂访问者网络是通过在两年的春夏季期间每月进行的调查创建的。灌木丛残留物的灭绝斜率（一种衡量灭绝如何通过网络级联的度量）以及网络的鲁棒性和嵌套度较高，这表明灌木丛残留物中的网络具有更高的功能完整性，但是如果被破坏，则可能会发生更多的级联灭绝。相反，居住花园中授粉媒介之间的生态位重叠较高，表明对资源的竞争加剧。除了归一化程度（在灌木丛残余中更高）以外，大多数物种水平的特性在生境之间没有差异。总而言之，看来住宅花园中的授粉网络在结构上与丛林遗迹中的授粉网络在结构上并不相同。这对于保护这个生物多样性热点中的野生蜂群具有重要意义，