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Positive correlation between helpers at nest and nestling immune response in a cooperative breeding bird

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Abstract

In cooperatively breeding species, helpers may contribute to the success of the brood by increasing the number of independent offspring, but also, they may affect offspring condition and, hence, their survival and recruitment into the breeding population. This second type of benefits is rarely included in theoretical models or assessed in field studies. Immune response is a good proxy of individual quality and fitness, and there is good evidence that the performance of the immune system of chicks during the nestling phase is related to their chances of survival and future reproduction. However, no study has so far explored whether helpers at the nest might contribute to enhance immune functioning of nestlings in species with a cooperative breeding system. Here we investigate this issue in the azure-winged magpie (Cyanopica cyanus) and found for the first time a positive correlation between the number of helpers at nest and the cell-mediated immune response of nestlings. This effect was not explained by a general improvement of body condition of chicks because it was independent of individual variation in body mass or tarsus length. Our results suggest that helping can have subtle effects on the quality of offspring that may influence their survival and future reproduction.

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Acknowledgements

We are grateful to M.A. Pitarch and the personnel of Valdesequera estate for permission and facilities, as well as to O. Jiménez and all other students who collaborated at different stages of the fieldwork. J. Carranza and one anonymous referee made helpful comments on the manuscript. Financial support was from Junta de Extremadura, Project 2PR02A080. Research of J.V. was supported by a postdoctoral grant by Ministerio de Educación y Ciencia of Spain, and that of E.S. by a postgraduated research grant from Junta de Extremadura. Bird trapping, banding, and manipulation were legally authorized by Junta de Extremadura.

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  1. Gabriele Sorci

    Present address: BioGéoSciences, CNRS UMR 5561, Université de Bourgogne, 6 Boulevard Gabriel, 21000, Dijon, France

Authors and Affiliations

  1. Lab. Parasitologie Evolutive, CNRS UMR 7103, Univ. Pierre et Marie Curie, 75252, Paris cedex 05, France

    Juliana Valencia & Gabriele Sorci

  2. Area de Zoología, Fac. Ciencias, Univ. Extremadura, 06071, Badajoz, Spain

    Elena Solís & Carlos de la Cruz

  3. Biología y Etología, Fac. Veterinaria, Univ. Extremadura, 10071, Cáceres, Spain

    Juliana Valencia

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  1. Juliana Valencia
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Correspondence to Juliana Valencia.

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Communicated by P. Heeb

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Valencia, J., Solís, E., Sorci, G. et al. Positive correlation between helpers at nest and nestling immune response in a cooperative breeding bird. Behav Ecol Sociobiol 60, 399–404 (2006). https://doi.org/10.1007/s00265-006-0179-z

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