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Green infrastructures and ecological corridors shape avian biodiversity in a small French city

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Abstract

In the context of increasing urbanization, preserving urban biodiversity has become a priority because biodiversity appears to be a key element when evaluating the well-being of urban residents. Recently, urban management has relied on a ‘renaturing’ strategy to improve biodiversity, but the benefits of these policies remain debated. In this study, we evaluated the effects of urban land use and green corridors on (1) urban avian biodiversity, and (2) the presence of the most common (top 70%) and least common (bottom 30%) bird species. We surveyed bird diversity at 102 sites during the Spring in a small French city, and performed a PCA on several habitat structures (e.g. roads, houses, grassy areas) to determine the level of urbanization of each site. Then, we tested with GLMMs the effects of land use (PC1), distance to the edge of the city, and distance to the corridor on bird diversity. We found a positive effect of green infrastructures on bird species richness, and this effect was reinforced by the proximity to the green corridor. Thus, bird species richness and the presence of common species were positively impacted by the presence of green areas, the proximity to the city edge and the proximity to the green corridor. The presence of the green corridor contributed significantly to the presence of rare species, which emphasizes its role in promoting avian biodiversity. Green corridors are a key element of the urban landscape because they allow less common species to colonize cities, and thus enhance urban biodiversity.

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Acknowledgments

We thank the “Mairie de Niort” for its financial support. We especially thank J. Baloge, M. Pailley, M. Vouhé-Barribaud and the “Mission Biodiversité et Éducation à l’Environnement de la Ville de Niort”. We also thank the Centre National de la Recherche Scientifique (CNRS), the Région Nouvelle Aquitaine (MULTISTRESS), the Agence Nationale de la Recherche (Urbastress, ANR-16-CE02-0004-01) and the Contrat de Plan État-Région ECONAT (CPER ECONAT) for funding. We thank S. Hope for correcting the English and E. Senac for her help with the surveys.

Funding

This project was supported by the Centre National de la Recherche Scientifique (CNRS), the Mairie de Niort, the Région Nouvelle Aquitaine (MULTISTRESS), the Agence Nationale de la Recherche (Urbastress, ANR-16-CE02–0004-01) and the Contrat de Plan État-Région ECONAT (CPER ECONAT).

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EB, FB and FA designed the study, conducted the statistical analyses, and drafted the manuscript.

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Correspondence to Erika Beaugeard.

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The authors have no conflict of interest to declare.

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Online Resource 1

Minimum adequate models to test the influence of the session and habitat variables included in PC1 on (a) total bird species richness, (b) rare bird species richness, (c) common bird species richness. (DOCX 16 kb)

Online Resource 2

Species observed on the 102 sites in Niort during the 3 sessions of survey (March, April and May 2017). All species are classified as Least Concern (LC) by the International Union for Conservation of Nature and Naturel Resources (IUCN, Red list of threatened species). (DOCX 15 kb)

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Beaugeard, E., Brischoux, F. & Angelier, F. Green infrastructures and ecological corridors shape avian biodiversity in a small French city. Urban Ecosyst 24, 549–560 (2021). https://doi.org/10.1007/s11252-020-01062-7

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  • DOI: https://doi.org/10.1007/s11252-020-01062-7

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