Abstract
Behavioural phenotypes can be highly constrained by interdependent behavioural traits. Studies in different taxa showed that these behavioural phenotypic correlations are not universal within a species and can differ between populations exposed to different environmental pressures. Empirical studies are required to better understand the relative contributions of long-term adaptive processes and direct ontogenetic mechanisms in the development of these phenotypic behavioural correlations. In the present study, we investigated the role of postnatal nurturing care on the development of behavioural correlations in a precocial bird model, the Japanese quail (Coturnix coturnix japonica). We compared phenotypic correlations between two populations: 41 artificially reared birds (maternally deprived) and 36 birds fostered by unrelated females. Behavioural responses were measured at the age when birds naturally disperse, with three widely used behavioural tests to assess fearfulness and sociality: tonic immobility, open-field and emergence tests. Our results show that when quail chicks are reared by a foster mother, more phenotypic correlations appeared in the population including correlations within and across behavioural functions and between behavioural responses and chick mass. In contrast, chicks reared without a foster mother presented much fewer behavioural correlations and those were limited to functionally linked behaviours. Our results also highlight that the effect of mothering on phenotypic correlations is sex-specific, with a greater effect on males. We discuss the organisational role of parents on the development of behavioural correlations, the mechanisms likely to support this influence, as well as the reasons for sexual dimorphism.
Significance statement
Mothers deeply influence the behavioural development of their offspring during the postnatal stage. Whether maternal presence and nurturing behaviour also affect correlations between behavioural responses of their offspring at a population level remains underexplored and unclear. In the current study, we used an adoption procedure to demonstrate the critical role of maternal postnatal care for the development of behavioural correlations in a precocial bird model widely used for the study of behavioural ontogeny: the Japanese quail. Our findings highlight that the presence of a maternally behaving female during early life promotes the development of correlations between behavioural responses both within and across behavioural functions in males but not in females.
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Data availability
The dataset analysed during the current study is available from the corresponding author on reasonable request.
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Acknowledgments
The authors would like to thank Tom Houslay for his critical statistical guidance and coding support. We thank Christophe Petton for his help rearing and maintaining the birds. We are grateful to Pr. Judy Stamps for her very helpful comments at the early stages of this work. We also thank the two anonymous reviewers and the editors whose suggestions helped improve this manuscript.
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All experiments were approved by the departmental direction of veterinary services (Ille et Vilaine, France, Permit number 005283) and were performed in accordance with the European Communities Council Directive of 24 November 1986 (86/609/EEC). Our breeding procedure and tests were approved by the regional ethics committee (agreement number: R-2011-SLU-02).
A particular care was taken to ensure animal welfare in this study. Adult females were transported by car in aluminium crates (70 × 30 cm and 22 cm high), each containing six individual boxes. The temperature was 20 °C during transportation and the journey lasted 20 min. Once at the laboratory, females used as adoptive mothers are routinely housed singly (Bertin and Richard-Yris 2005; Houdelier et al. 2011) because, under natural conditions, they incubate and care for their chicks alone (Guyomarc’h and Saint-Jalme 1986). We did not provide hiding places because we needed to monitor the chicks every day without disturbing the brood. Cages were behind one-way mirrors to limit disturbance, and we checked that the females showed no stereotypies, distress calls or flight attempts, and that they carried out normal comfort behaviours such as dust bathing, which was facilitated by plastic netting covering the cage floor.
We observed no cases of maternal abuse and one case of maternal induction failure resulting in the mother not warming the chicks once out of the induction box. M and NM chicks showing signs of hypothermia were all put under a heater in plastic cages (98 × 35 cm and 42 cm high) where they swiftly recovered (in less than 1 h).
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Pittet, F., Tyson, C., Herrington, J.A. et al. Postnatal care generates phenotypic behavioural correlations in the Japanese quail. Behav Ecol Sociobiol 73, 120 (2019). https://doi.org/10.1007/s00265-019-2735-3
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DOI: https://doi.org/10.1007/s00265-019-2735-3