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Influence of habitat type and distance from source area on bird taxonomic and functional diversity in a Neotropical megacity

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Abstract

The Neotropical region has been subjected to massive urbanization, which poses high risks for some global biodiversity hotspots and losses of ecosystem functions and services. In this study, we investigate how distance from large patches of native forests (source areas) and vegetation (green)/and infrastructure (gray) characteristics affect bird species richness and functional diversity in São Paulo megacity, southeastern Brazil. We analyzed the effects of source areas and green/gray characteristics on species richness and functional diversity (richness, evenness, and divergence) indices. We detected 231 bird species, and our data confirmed our predictions: (1) bird species richness in urbanized habitats was found to be (~ 50–85%) lower than in source habitats; (2) species richness and trait composition significantly decreased as the distance from the source area increased, while functional richness was not affected by this metric; and (3) shrub and herbaceous covers and maximum height of trees were positively correlated with species richness and unique functional traits regarding habitat, diet, foraging and nesting strata and dispersal ability of birds in the forest-urban matrix. The number of buildings was negatively correlated with bird species richness and functional richness. Maximum height of buildings caused dramatic declines in functional evenness. Functional divergence was notably lower in sites with high shrub cover. Our study stresses the complexity of vegetation embedded in large Neotropical urban settlements and the need to maintain large protected areas surrounding megacities to mitigate the impacts of urbanization on birds.

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Acknowledgements

We wish to thank the financial aid provided by the Fundação de Amparo à Pesquisa do Estado de São Paulo – FAPESP (2016/26082-1; USP-Humboldt Universtät zu Berlin – Strategic Partnership Initiatives, 2017), and the Programa de Pós-Graduação em Ecologia e Recursos Naturais of the Universidade Federal de São Carlos (UFSCar). We also thank the colleagues from the Guarulhos Zoo Carlos Ferreira, David Braga and Cristiane Bolochio for the help with data collection. We are grateful to Fundação Florestal – COTEC (SMA), DEPAVE-3 (SVMA), and Guarulhos Zoo (SEMA) for permitting the conduction of ornithological studies in protected areas, and to the managers of Cantareira and Itaberaba State Parks Elisângela Moino and Ana Lúcia Arromba, respectively, for helping us in the field logistic. We sincerelly appreciate all valuable comments and suggestions from two anonymous reviewers, which substantially improved the quality of the manuscript. We also thank Felipe Martello, Luiz dos Anjos, Mercival Francisco, and Reginaldo Donatelli for valuable comments on earlier version of this manuscript.

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São Paulo Research Foundation – FAPESP (2016/26082–1).

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All authors have equally contributed to the research.

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Correspondence to Marcos Antônio Melo or Augusto João Piratelli.

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Melo, M.A., Sanches, P.M., Silva Filho, D.F. et al. Influence of habitat type and distance from source area on bird taxonomic and functional diversity in a Neotropical megacity. Urban Ecosyst 25, 545–560 (2022). https://doi.org/10.1007/s11252-021-01169-5

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  • DOI: https://doi.org/10.1007/s11252-021-01169-5

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