By the end of 2020, 75% of the Swiss population will live in cities. The urban densification will result in habitat and biodiversity loss. One solution to mitigate this loss in urban environments is the implementation of green roofs that are now recognised as a tool for the maintenance of epigeal and aerial arthropods. Green roofs can provide various services such as pollination and food supply for insects and various arthropods (e.g. arachnids) and animals (e.g. birds).The objective of this study was to evaluate the diversity of pollinating insects emerging from urban green roofs. Wild bees (Hymenoptera) and hoverflies (Diptera) were sampled using emergence traps on six extensive green roofs in the urban area of Geneva (Switzerland), from March to August 2017. Five species of wild bees and two species of hoverflies were identified: Lasioglossum morio (Halictidae) and Sphaerophoria scripta (Syrphidae) are the only two species considered as emerging from green roofs in our study. Ecological traits of these two species indicated generalists, well adapted to xero-thermophilic conditions.

中文翻译：

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来自广泛的绿色屋顶的传粉媒介：瑞士日内瓦的野生蜜蜂（膜翅目，Anthophila）和蚜虫（双翅目，Syrphidae）

到2020年底，瑞士人口的75％将生活在城市中。城市密集化将导致栖息地和生物多样性的丧失。减轻城市环境中这种损失的一种解决方案是实施绿色屋顶，现在人们公认屋顶绿化是维护epi虫和空中节肢动物的工具。绿色屋顶可以提供各种服务，例如为昆虫，各种节肢动物（例如蜘蛛）和动物（例如鸟类）的授粉和食物供应。本研究的目的是评估从城市绿色屋顶出现的授粉昆虫的多样性。2017年3月至2017年8月，在日内瓦（瑞士）市区的六个宽大绿色屋顶上使用突现陷阱对野生蜜蜂（膜翅目）和蚜蝇（双翅目）进行了采样。确定了五种野生蜂和两种蚜虫：Lasioglossum morio（Halictidae）和Sphaerophoria scripta（Syrphidae）是我们研究中仅有的两个从绿色屋顶出现的物种。这两个物种的生态学特征表明他们是多面手，非常适合于干热条件。