Parents' social problems affect their children -- even in birds

December 27, 2010

It may come as a surprise to many that quails are able to distinguish one another, let alone that they form close relationships with other quails. Nevertheless, it has long been known that disruption of the birds' social environment causes them stress. A group within the UMR 6552 at the CNRS-Université de Rennes 1 in France has been studying the influence of adults on the behavioural development of their offspring. Together with scientists in Austria, they have now shown that changing the composition of groups of quails housed together causes the birds to behave more aggressively towards one another. In parallel, the level of steroid hormones (corticosterone) in their blood increases when their group composition is disrupted.

Intriguingly, the eggs they lay were found to have significantly higher levels of testosterone when the mothers were subjected to social stress of this kind. The results are consistent with previous findings from other groups, which showed that House sparrows, American coots and Common starlings lay eggs with more testosterone when they breed in dense colonies than when they nest in isolation. But the new work from the French-Austrian collaboration goes considerably further, showing that the eggs of females under social stress hatch later and the chicks grow more slowly after hatching, at least for the first three weeks. There are also indications that the chicks' behave differently: they are more cautious and seem more susceptible to disturbance. Furthermore, they tend to move about more, which can be interpreted as increased attempts to escape from threats or to seek more social contact.

The results show how much the growth and behaviour of chicks is influenced by the concentrations of steroid hormones in the eggs from which they hatched. As Möstl says, "We know that stress on female mammals influences the development of their young, which takes place in the womb, but it was a big surprise that social stress causes such changes in the level of hormones in the yolks of birds' eggs." The social environment of mother quails thus has a direct effect on the growth and the behaviour of their offspring. It seems, then, that pre-natal nurture is extremely important in birds as well as in mammals and this finding is sure to add fresh fuel to the century-old nature versus nurture debate.
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The paper Social Instability in Laying Quail: Consequences on Yolk Steroids and Offspring's Phenotype by Floriane Guibert, Marie-Annick Richard-Yris, Sophie Lumineau, Kurt Kotrschal, Daniel Guémené, Aline Bertin, Erich Möstl and Cécilia Houdelier was published in November by PLoS ONE (10.1371/journal.pone.0014069).

About the University of Veterinary Medicine, Vienna

The University of Veterinary Medicine, Vienna is the only academic and research institution in Austria that focusses on the veterinary sciences. About 1000 employees and 2300 students work on the campus in the north of Vienna, which also houses the animal hospital and various spin-off-companies. http://www.vetmeduni.ac.at

Scientific contact: Prof Erich Möstl, E erich.moestl@vetmeduni.ac.at, T +43 1 25077-4102, M +43 650 725 0950

Released by: Klaus Wassermann, E klaus.wassermann@vetmeduni.ac.at, T +43 1 25077-1153

University of Veterinary Medicine -- Vienna

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