Abstract
Urbanisation constitutes one of the most rapid human-induced environmental changes, developing at the expense of natural and semi-natural habitats. It often implies alterations of many abiotic and biotic factors and contributes to create new environmental conditions, including temperature, food resources, competition and predation. Despite increasing empirical evidence of intra-specific divergence in phenotypic traits (e.g., physiological, behavioural or morphological) between urban and rural individuals, such patterns have often remained disconnected from the underlying mechanisms involved. In the current study, we tested for divergence in functional morphological traits that are related to feeding ecology (i.e., bill morphology, body mass and condition) and/or to the locomotory performance in escaping from predators (i.e., wing, tarsus and tail morphology, body mass and condition) along a chronological gradient of urbanisation (old urban, recent urban and rural areas), using the New Zealand fantail, an endemic insectivorous passerine species. We found divergences in phenotypic traits related to bill morphology along the urban–rural gradient: birds inhabiting the old urban area had stubbier bills (i.e., shorter, deeper and wider bills) than those inhabiting the recent urban and rural areas. We did not detect any difference in locomotion-related morphological traits. Our results suggest the urbanisation-induced alteration in food resources may drive morphological divergence in bird populations. We emphasized the need for mechanistic and experimental studies, with a particular focus on resource-based mechanisms, to identify more precisely the morphological responses of urban populations to changes in food composition, and the resulting implications for communities in urban ecosystems.
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Data availability
The dataset analysed during the current study is available in the Open Science Framework repository, https://doi.org/10.17605/osf.io/BF2TZ.
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Acknowledgements
We thank the anonymous reviewers and editors for their valuable comments on the manuscript.
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This project was supported by the Institute of Natural and Mathematical Sciences of Massey University.
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CA and WJ contributed to the study conception and design. Data collection was performed by CA. Data analysis was conducted by CA and CH. The first draft of the manuscript was written by CH and all authors commented and amended on previous versions of the manuscript. All authors read and approved the final manuscript.
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The study was conducted with clearance from the Massey University Animal Ethics Committee (10/102), Auckland Council and Department of Conservation (AK-29598-FAU), who gave the permission to handle the study birds. The study thus adheres to the ethical use of animals in research and to the legal requirements of New Zealand in which the work has been carried out.
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Amiot, C., Harmange, C. & Ji, W. Morphological differences along a chronological gradient of urbanisation in an endemic insectivorous bird of New Zealand. Urban Ecosyst 25, 465–475 (2022). https://doi.org/10.1007/s11252-021-01156-w
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DOI: https://doi.org/10.1007/s11252-021-01156-w