Abstract
Experimental studies were carried out on the behavior of the host concerning egg discrimination in three geographic populations of the Yellow-browed Warbler with different levels of brood parasitism of the Oriental Cuckoo. The absence of a spotted pattern on the shell of foreign eggs was shown to fail to serve as a stimulus to recognition. The acceptance or rejection of a foreign egg is determined by the ratio of the parasite to the host egg breadth, the mean size of the eggs in the individual host clutch also being of importance. This suggests that the recognition of parasite eggs by the host is based on the tactile contact of the female with the uneven surface of the clutch. The mean breadth of the Oriental Cuckoo eggs introduced into Yellow-browed Warbler nests is significantly smaller than the value at which the probability of egg rejection is equal to the probability of acceptance. As it is also smaller than in other gentes, this shows the adaptation of the brood parasite to this particular host. The acceptance of a foreign egg, ejection of it from the nest, and clutch desertion represent three stages of the same reaction in response to variation in a quantitative stimulus.
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ACKNOWLEDGMENTS
The authors are grateful to A.A. Meshcheryagin for help in finding and observing nests; I.F. Vurdova, A.A. Ananin, and E.Yu. Demidova for assistance in field work and collecting materials on the brood parasitism of cuckoos; P.S. Tomkovich and Ya.A. Red’kin for the organization of work in museum funds; N.N. Balatsky and V.N. Sotnikov for providing collection materials; N.I. Markov for valuable advice in planning experiments; and A.V. Gilev for advice on statistical data analysis.
Funding
This work was carried out within a state task of the Institute of Plant and Animal Ecology, Ural Branch, Russian Academy of Sciences, supported by the Comprehensive Program of the Ural Branch, Russian Academy of Sciences (project no. 18-9-4-22) and a grant of the Russian Foundation for Basic Research (project no. 18-04-00269a).
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Meshcheryagina, S.G., Bachurin, G.N., Bourski, O.V. et al. Egg Size as the Main Stimulus to Discriminatory Behavior of the Yellow-Browed Warbler (Phylloscopus inornatus, Phylloscopidae) under Brood Parasitism of the Oriental Cuckoo (Cuculus optatus, Cuculidae). Biol Bull Russ Acad Sci 47, 821–835 (2020). https://doi.org/10.1134/S1062359020070109
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DOI: https://doi.org/10.1134/S1062359020070109