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Erschienen in: Urban Ecosystems 5/2021

07.01.2021

An avian urban morphotype: how the city environment shapes great tit morphology at different life stages

verfasst von: Aude E. Caizergues, Anne Charmantier, Marcel M. Lambrechts, Samuel Perret, Virginie Demeyrier, Annick Lucas, Arnaud Grégoire

Erschienen in: Urban Ecosystems | Ausgabe 5/2021

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Abstract

Urbanization is a worldwide phenomenon associated with tremendous modifications of natural habitats. Understanding how city dwelling species are affected by those changes is becoming a pressing issue. We presently lack fine scale spatio-temporal studies investigating the impact of urbanization across different life stages and along urbanization gradients. Based on 8 years of monitoring of urban and forest great tits (Parus major), we investigated how city life shapes morphological characteristics at different life stages in the city versus the forest, and within the urban habitat (along naturalness and pedestrian frequency gradients). We found that urban nestlings were significantly smaller than forest ones, but not in lower body condition. Urban breeders showed reduced tarsus, wing and tail lengths compared to forest birds. Within the city, variation in nestling tarsus length and body condition along the naturalness gradient highly depended on the year, with no consistent pattern. For breeders, tarsus length and body condition were positively correlated to the naturalness gradient, although only in 2019 for tarsus, and only in older individuals for body condition. Finally, we found that males had smaller wing lengths in more urbanized parts of the city. These results suggest that urbanization affects morphology early on in development, influencing many morphological attributes. While the mechanisms underlying the urban morphotype remain to be determined, we discuss the potential origins for the documented differences between forest and urban morphotypes, and argue that they most probably result from urban environmental constraints linked to food availability.

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Metadaten
Titel
An avian urban morphotype: how the city environment shapes great tit morphology at different life stages
verfasst von
Aude E. Caizergues
Anne Charmantier
Marcel M. Lambrechts
Samuel Perret
Virginie Demeyrier
Annick Lucas
Arnaud Grégoire
Publikationsdatum
07.01.2021
Verlag
Springer US
Erschienen in
Urban Ecosystems / Ausgabe 5/2021
Print ISSN: 1083-8155
Elektronische ISSN: 1573-1642
DOI
https://doi.org/10.1007/s11252-020-01077-0

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