Abstract Urban green spaces have gained notoriety in recent years, as they have been argued to play an important role in supporting native biodiversity, ecosystem services and human well-being. However, such a promising perspective is poorly investigated in the tropical context. Here we examine the role played by urban green areas in a major city (Recife-Brazil) as a repository for Atlantic forest biodiversity relative to pollination systems. Plant assemblages were examined across 17 urban green areas and compared to those from ten old-growth forest stands in the largest Atlantic forest remnant in northeastern Brazil (natural areas). Just a small portion of tree species inhabiting urban green areas is native to the northeastern Brazilian Atlantic forest (29.8 %). At plant community-level, squares and parks were impoverished in terms of number of species and individuals with specialized pollination systems (e.g. bats, Sphingids), as compared to forest remnants. Moreover, urban green areas were dominated by generalist-pollinated trees with reproductive traits associated with easily accessible floral resources and an increase of hermaphrodites. Finally, squares and parks had similarly low functional diversity of reproductive traits. Our results suggest that urban green areas support largely distorted and impoverished tree assemblages in terms of floral rewards and pollination, while services are restricted to those offered by generalist small insects. This pattern emerges mainly from the contribution of exotic plants. This largely limits the tropical urban green areas as biodiversity repositories and potential source for specialized pollination services, what calls for a better use of tropical urban areas as conservation tool.

中文翻译：

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城市绿地只保留了大西洋森林树木繁殖多样性的一小部分

摘要 近年来，城市绿地声名狼藉，因为它们被认为在支持本地生物多样性、生态系统服务和人类福祉方面发挥着重要作用。然而，在热带环境中，这种有前途的观点很少被研究。在这里，我们研究了主要城市（累西腓-巴西）的城市绿地作为大西洋森林生物多样性相对于授粉系统的储存库所发挥的作用。对 17 个城市绿地的植物组合进行了检查，并与巴西东北部最大的大西洋森林遗迹（自然区域）中的 10 个古老林分的植物组合进行了比较。只有一小部分居住在城市绿地的树种原产于巴西大西洋东北部的森林 (29.8%)。在植物群落层面，与森林残余物相比，广场和公园在拥有专门授粉系统的物种和个体数量（例如蝙蝠、天蝎座）方面处于贫困状态。此外，城市绿地以通才授粉树木为主，其生殖特征与容易获得的花卉资源和雌雄同体的增加有关。最后，广场和公园的生殖性状功能多样性同样低。我们的结果表明，在花卉奖励和授粉方面，城市绿地在很大程度上支持扭曲和贫瘠的树木组合，而服务仅限于通才小昆虫提供的服务。这种模式主要来自外来植物的贡献。