Worldwide bird assemblages across urban-wildland gradients

We gathered presence/absence and abundance data from published studies and reports for 319 well-characterized assemblages spanning 50 cities from Africa, Australia, Europe, North America and South America. We focused on cities with comparable survey data within urban habitats and in nearby natural habitat. The final dataset contains almost 10,000 records for 1507bird species, 66 of which are introduced (non-native) in at least one study region. Species abundance per unit area or unit time were available for 269 assemblages from 42 cities, comprising 1353 species. Following Newbold et al. (2015), we used published habitat descriptions to classify the intensity of human use in urban habitats for each assemblage: (1) highly urbanised environments mainly contain densely packed buildings with vegetation scarce or absent; (2) moderately urbanised environments are residential areas with single-family houses and associated gardens; and (3) little-urbanised environments have few buildings and ab...我们从已发表的研究与报告中，收集了覆盖非洲、澳大利亚、欧洲、北美及南美50座城市的319个经过充分表征的群落的出现/缺失与物种多度数据。本研究聚焦于那些在城市生境及邻近自然生境中具备可比调查数据的城市。最终数据集包含1507种鸟类的近10000条记录，其中66种在至少一个研究区域为外来引入种（非本土物种）。来自42座城市的269个群落拥有单位面积或单位时间的物种种多度数据，共涉及1353个物种。遵循Newbold等人（2015）的研究方法，我们借助已发表的生境描述，对每个群落的城市生境人类活动强度开展分类：(1) 高度城市化生境：以密集建筑群为主，植被稀缺或缺失；(2) 中度城市化生境：以独栋住宅及配套花园为主的居住区；(3) 低度城市化生境：建筑数量稀少且……