ArticleEcology and evolution2026
An Analysis of Great Tit Egg Traits Across the City Mosaic: Urbanisation Does Not Affect Egg Size and Pigmentation Patterns.
Article in Ecology and evolution, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Abstract
Rapid urbanisation provides remarkable opportunities to study how sudden, extreme changes impact wildlife. Compared to natural areas, cities are characterised by factors affecting abiotic (e.g., climate, habitat fragmentation) and biotic (e.g., species composition, phenology) components of the ecosystem, ultimately changing the ecological and evolutionary dynamics of those habitats. Similarly to many other taxonomic groups, urban birds differ from rural birds in morphology, behaviour and reproductive patterns. Yet potential associations between urbanisation and avian egg traits-a key aspect of birds life-cycle-remain under-researched. Given the limited availability of primary natural calcium sources (snails) in cities, eggs from heavily urbanised areas were expected to be smaller and more pigmented, indicating thinner shells and lower overall egg quality. To better understand how urbanisation affects egg traits, data on 718 great tit (
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