Consistent and correlated inter-individual differences in behaviours, the so-called ‘personalities’, have been identified in many vertebrates. The ability to respond to stressful events is part of personalities and can have important fitness consequences, as it determines how individuals cope with environmental challenges. As a consequence of pleiotropic effects of genes involved in several functions, inter-individual differences in behavioural responses can be associated with phenotypic traits, like melanin-based plumage colouration in birds. We examined the association between three proxies of the behavioural stress response and breast plumage colouration in barn swallow (Hirundo rustica) nestlings. We found that nestling behavioural responses were consistent within individuals and similar among siblings, thus suggesting that these behaviours may contribute to define individual ‘personalities’. However, nestling behavioural stress response was not significantly predicted by variation in breast plumage colouration, indicating that in juveniles of this species melanin-based colouration does not convey to conspecifics reliable information on individual ability to cope with stressful events.
Colouration signals the ability to cope with elevated stress hormones: effects of corticosterone on growth of barn owls are associated with melanism. —
J. Evol. Biol.25:
Brood size, telomere length, and parent-offspring color signaling in barn swallows. —
The regulation of melanin production. — In:
The pigmentary system: physiology and pathophysiology (
NordlundJ.J.BoissyR.HearingV.J.KingR.A.OrtonneJ.P., eds). Oxford University Press, New York, NY, p.
Signaling stress? An analysis of phaeomelanin-based plumage color and individual corticosterone levels at two temporal scales in North American barn swallows, Hirundo rustica erythrogaster. —
KoolhaasJ.M.KorteS.M.De BoerS.F.Van Der VegtB.J.Van ReenenC.G.HopsterH.De JongI.C.RuisM.A.W.BlokhuisH.J. (1999).
Coping styles in animals: current status in behavior and stress-physiology. —
Neurosci. Biobehav. Rev.23:
Behavioural responses to handling stress in the Great Tit: within-individual consistency and the effect of age, sex and body condition. —
Mechanics of carotenoid-based colouration. — In:
Bird colouration, volume I, mechanisms and measurements (
HillG.E.McGrawK.J., eds). Harvard University Press, Cambridge, MA, p.
You can’t judge a pigment by its color: carotenoid and melanin content of yellow and brown feathers in swallows, bluebirds, penguins, and domestic chickens. —
Sex allocation according to multiple sexually dimorphic traits of both parents in the barn swallow (Hirundo rustica). —
J. Evol. Biol.28:
Geographical and seasonal variation in the intensity of sexual selection in the barn swallow Hirundo rustica: a meta-analysis. —
Sexual dimorphism in melanin pigmentation, feather colouration and its heritability in the barn swallow (Hirundo rustica). —
PLoS ONE8: e58024.
Viability is associated with melanin-based colouration in the barn swallow (Hirundo rustica). —
PLoS ONE8: e60426.
Agouti-related protein stimulates the hypothalamic-pituitary-adrenal (HPA) axis and enhances the HPA response to interleukin-1 in the primate. —