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August 1, 2026Ecology and EvolutionOpen Access

An Analysis of Great Tit Egg Traits Across the City Mosaic: Urbanisation Does Not Affect Egg Size and Pigmentation Patterns

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Authors

ISIgnacy StadnickiMuseum of the History of ScienceMCMichela CorsiniEurac ResearchKSKlaudia SzalaGeorge Mason University

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Implication

Randomized trial examines egg traits in great tits, indicating urbanisation does not affect size or pigmentation.

Key Points

  • This research aims to explore the influence of urbanisation on egg traits in great tits.
  • Collected data on 718 great tit eggs from 90 clutches across eight city sites over two breeding seasons.
  • Photographed and analyzed clutches using digital imaging to assess egg volume and pigmentation.
  • Quantified urbanisation via the percentage of impervious surface area around each clutch using satellite imagery.
  • No significant association found between urbanisation and egg size or pigmentation patterns.
  • Egg volume found to vary with lay date and female body condition, but not urbanisation.
  • While urban clutches are smaller, their eggs show similar volume and pigmentation as those in rural habitats.

Cite This Study

Stadnicki et al. (2026) studied this question.

synapsesocial.com/papers/6a6d980be258b358b3c6aeafhttps://doi.org/10.1002/ece3.73867
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Variation in egg size and nestling growth rate in relation to clutch size and laying sequence in great tits Parus major2009 · 22 citations
  2. 2Urbanization Is Associated with Divergence in Pace-of-Life in Great Tits2017 · 138 citations
  3. 3Incubation and hatching periods in a Mediterranean Great Tit Parus major population2014 · 20 citations
  4. 4Role of Heredity in Egg Size Variation in the Great Tit Parus major and the Pied Flycatcher Ficedula hypoleuca1979 · 113 citations
  5. 5A Comparative Sudy of the Breeding Ecology of the Great TitParus majorin Different Habitats2002 · 524 citations