Abstract
Urbanization constitutes a primary driver of the global biodiversity crisis, yet how historical urban legacy effects shape contemporary biodiversity remains unclear. Neglecting lagged ecological consequences such as extinction debts and colonization credits could obscure both the risks of future urban biodiversity loss and the effectiveness of conservation efforts. Here, by integrating equilibrium and non-equilibrium models, we quantified 31-year legacy effects of urbanization on bird communities and species in China. We found that China’s uneven urbanization has generated widespread extinction debts and colonization credits across the taxonomic, functional and phylogenetic dimensions of bird communities. The lag durations of various urban environmental characteristics differed, with historical vegetation cover and anthropogenic activities having long-lasting impacts on existing bird distributions. In particular, species-specific lagged responses were identified, which were correlated with each species’ capacity to adapt to urban environment (urban tolerance). These findings underscore the necessity of integrating long-term biodiversity considerations into urban governance through forward-looking approaches as well as providing critical insights for biodiversity-friendly urban planning.
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Data availability
The data generated in this study are available via figshare at https://doi.org/10.6084/m9.figshare.29850275 (ref. 77). The normalized difference vegetation index data (1990–2020) are available at https://doi.org/10.1038/s41597-024-03364-3. Land cover datasets (1990–2020) are available at https://doi.org/10.5194/essd-13-3907-2021. Climate data, including temperature and precipitation (1990–2020), are available at https://cstr.cn/18406.11.Meteoro.tpdc.270961 and https://doi.org/10.5281/zenodo.3114194. Population data (1990–2020) are available at https://doi.org/10.1038/s41597-024-02913-0, whereas nighttime light data (1990–2020) are accessible at https://doi.org/10.1038/s41597-024-03223-1. The species’ life-history traits are available at https://doi.org/10.1111/ele.13898, https://doi.org/10.1038/s41597-025-05615-3 and https://avibase.bsc-eoc.org/avibase.jsp. The phylogenetic tree is available at https://doi.org/10.1073/pnas.2409658122.
Code availability
The code that supports the findings of this study is available via figshare at https://doi.org/10.6084/m9.figshare.29850275 (ref. 77).
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Acknowledgements
We are grateful to numerous participants from various regions for their efforts in collecting and sharing species distribution records. We thank the biodiversity monitoring platforms for their sustained support in organizing species observation projects. We are grateful to R. Sun (Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences) and his team for generously providing the urban boundary data. We also appreciate C. Xu for her assistance with data compilation. This work was supported by the Key Project of the National Natural Science Foundation of China under grant number 52238003 to C. Du and Y.W.
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X.L., Y.C. and Y.W. jointly conceived this research. X.L., Y.G. and Y.J. developed the methodology. X.L., Y.G., G.L. and X.T. performed the data analyses and prepared the figures. X.L., Y.G., J.L. and Y.W. wrote the original draft. X.L., Y.W., J.S., Y.C. and H.W. reviewed and edited the draft. All authors contributed to the manuscript.
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Nature Cities thanks Fabio Angeoletto, Juan Hernández-Agüero and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Lu, X., Guo, Y., Shen, J. et al. Multidecadal legacy of uneven urbanization on divergent prospects for bird biodiversity. Nat Cities 3, 176–188 (2026). https://doi.org/10.1038/s44284-025-00381-0
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DOI: https://doi.org/10.1038/s44284-025-00381-0


