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Updated: Jun 14, 2026
07:34
Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients
Published on: August 22, 2018
Egg phenotype differentiation in sympatric cuckoo Cuculus canorus gentes
Anton Antonov1, B G Stokke, J R Vikan
1Centre for Advanced Study, Norwegian Academy of Science and Letters, Drammensveien, Oslo, Norway. anton.antonov@bio.ntnu.no
Journal of Evolutionary Biology
|March 30, 2010
Summary
Common cuckoo (Cuculus canorus) gentes exhibit remarkable egg mimicry to their hosts, even in sympatry. This study reveals that egg size, alongside color, is crucial for maintaining mimicry despite potential gene flow.
Area of Science:
- Avian biology
- Evolutionary ecology
- Behavioral ecology
Background:
- Brood parasitic common cuckoos (Cuculus canorus) have specialized gentes that mimic host eggs.
- Sympatric gentes may face challenges in maintaining mimicry due to host switching and potential gene flow.
Purpose of the Study:
- To investigate egg trait differentiation and mimicry in three sympatric common cuckoo gentes.
- To assess the role of egg size in cuckoo-host egg mimicry.
Main Methods:
- Comparative analysis of egg traits (size, color) across three cuckoo gentes and their respective hosts.
- Study conducted in sympatry with overlapping habitats.
Main Results:
- Three cuckoo gentes demonstrated significant egg mimicry to great reed warblers, marsh warblers, and corn buntings.
- Mimicry was observed in egg size, background color, and spot patterns.
- Egg phenotype matching was maintained despite the potential for inter-gens gene flow.
Conclusions:
- Egg size is a significant, yet often overlooked, component of cuckoo egg mimicry.
- Effective egg mimicry is maintained in sympatric populations, countering predictions of reduced mimicry due to gene flow.
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