Data from: Habitat restoration promotes pollinator persistence and colonization in intensively-managed agriculture

Widespread evidence of pollinator declines has led to policies supporting habitat restoration including in agricultural landscapes. Yet, little is yet known about the effectiveness of these restoration techniques for promoting stable populations and communities of pollinators, especially in intensively-managed agricultural landscapes. Introducing floral resources, such as flowering hedgerows, to enhance intensively cultivated agricultural landscapes is known to increase the abundances of native insect pollinators in and around restored areas. Whether this is a result of local short-term concentration at flowers or indicative of true increases in the persistence and species richness of these communities remains unclear. It is also unknown whether this practice supports species of conservation concern (e.g., those with more specialized dietary requirements). Analyzing occupancies of native bees and syrphid flies from 330 surveys across 15 sites over eight years, we found that hedgerow restoration promotes rates of between-season persistence and colonization as compared with unrestored field edges. Enhanced persistence and colonization, in turn, led to the formation of more species-rich communities. We also find that hedgerows benefit floral resource specialists more than generalists, emphasizing the value of this restoration technique for conservation in agricultural landscapes.已有大量证据表明传粉者种群出现衰退，这推动了相关政策出台，支持在包括农业景观在内的区域开展生境修复工作。然而，目前对于此类修复技术在促进传粉者稳定种群与群落方面的效果仍知之甚少，在集约化管理的农业景观中这一问题尤为突出。为改善集约化耕作的农业景观而引入花源资源（如开花绿篱），已被证实可提升修复区域及其周边本土昆虫传粉者的种群丰度。但目前仍不清楚，这一现象究竟是传粉者短期在花源处局部聚集的结果，还是反映了这些传粉群落的存续能力与物种丰富度的真实提升。此外，此类修复措施是否能惠及保育关注物种（例如那些食性更为特化的物种），同样尚不明确。本研究通过对15个监测点、8年间开展的330次调查数据中本土蜂类与食蚜蝇（syrphid flies）的种群占有率进行分析，发现相较于未修复的田埂边缘，绿篱修复可提升传粉者的季间存续率与定殖率。而存续率与定殖率的提升，进而推动了物种更丰富的传粉群落的形成。本研究同时发现，相较于泛化物种，绿篱对花源特化物种的增益效果更为显著，这进一步凸显了该修复技术在农业景观保育中的应用价值。