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Quantifying nectar production by flowering plants in urban and rural landscapes
Journal of Ecology ( IF 5.5 ) Pub Date : 2021-01-26 , DOI: 10.1111/1365-2745.13598
Nicholas E. Tew 1 , Jane Memmott 1, 2 , Ian P. Vaughan 3 , Stephanie Bird 4 , Graham N. Stone 5 , Simon G. Potts 6 , Katherine C. R. Baldock 1, 2, 7
Affiliation  

  1. Floral resources (nectar and pollen) provide food for insect pollinators but have declined in the countryside due to land use change. Given widespread pollinator loss, it is important that we quantify their food supply to help develop conservation actions. While nectar resources have been measured in rural landscapes, equivalent data are lacking for urban areas, an important knowledge gap as towns and cities often host diverse pollinator populations.
  2. We quantified the nectar supply of urban areas, farmland and nature reserves in the UK by combining floral abundance and nectar sugar production data for 536 flowering plant taxa, allowing us to compare landscape types and assess the spatial distribution of nectar sugar among land uses within cities.
  3. The magnitude of nectar sugar production did not differ significantly among the three landscapes. In urban areas the nectar supply was more diverse in origin and predominantly delivered by non‐native flowering plants. Within cities, urban land uses varied greatly in nectar sugar production. Gardens provided the most nectar sugar per unit area and 85% of all nectar at a city scale, while gardens and allotments produced the most diverse supplies of nectar sugar. Floral abundance, commonly used as a proxy for pollinators’ food supply, correlated strongly with nectar resources, but left a substantial proportion of the variation in nectar supply unexplained.
  4. Synthesis. We show that urban areas are hotspots of floral resource diversity rather than quantity and their nectar supply is underpinned by the contribution of residential gardens. Individual gardeners have an important role to play in pollinator conservation as ornamental plants, usually non‐native in origin, are a key source of nectar in towns and cities.


中文翻译:

量化城市和乡村景观中开花植物的花蜜产量

  1. 花卉资源(花蜜和花粉)为昆虫授粉者提供食物,但由于土地用途的变化,农村地区的花卉资源有所减少。考虑到传粉媒介的大量流失,重要的是,我们必须量化它们的食物供应量,以帮助开展保护行动。尽管在农村地区已对花蜜资源进行了测量,但城市地区却缺乏等效的数据,这是一个重要的知识鸿沟,因为城镇经常容纳各种传粉媒介。
  2. 通过结合536种开花植物分类单元的花卉丰度和花蜜糖生产数据,我们对英国市区,农田和自然保护区的花蜜供应进行了量化,从而使我们能够比较景观类型并评估花蜜糖在城市内土地利用之间的空间分布。
  3. 在这三个地区中,花蜜糖的产量没有显着差异。在城市地区,花蜜的供应来源更加多样化,并且主要由非本地的开花植物提供。在城市内部,城市土地用途的花蜜糖生产差异很大。在城市规模中,花园提供的单位面积花蜜糖最多,占所有花蜜的85%,而花园和配给区则提供了最多样的花蜜糖。通常用作花粉授粉者食物供应的代名词的花的丰度与花蜜资源密切相关,但花蜜供应变化的很大一部分仍无法解释。
  4. 综合。我们表明,城市地区是花卉资源多样性而不是数量的热点,其花蜜供应由住宅花园的贡献来支撑。个体园丁在传粉媒介保护中起着重要作用,因为观赏植物通常是非本地的,是城镇中花蜜的重要来源。
更新日期:2021-01-26
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