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Chicks of the great spotted cuckoo may turn brood parasitism into mutualism by producing a foul-smelling secretion that repels predators

Gregory Röder, Daniela Canestrari, Diana Bolopo, José M. Marcos, Neil Villard, Vittorio Baglione & Ted Turlings

Résumé The great spotted cuckoo (Clamator glandarius) is an important brood parasite of carrion crows (Corvus corone corone) in northern Spain. We recently found that, unlike what is commonly known for cuckoo-host interactions, the great spotted cuckoo has no negative impact on average crow fitness in this region. The explanation for this surprising effect is a repulsive secretion that the cuckoo chicks produce when they are harassed and that may protect the brood against predation. Here, we provide details on the chemical composition of the cuckoo secretion, as well as conclusive evidence that the dominating volatile chemicals in the secretion are highly repellent to model species representative of common predators of the crows. These results support the notion that, in this particular system, the production of a repulsive secretion by the cuckoo chicks has turned a normally parasitic interaction into a mutualistic one.
   
Mots-clés great spotted cuckoo, clamator glandarius, carrion crows, corvus corone corone, repellency, predators, brood parasitism, mutualism, chemical defense, birds, adaptations, cowbirds, hosts
   
Citation Röder, G., Canestrari, D., Bolopo, D., Marcos, J. M., Villard, N., Baglione, V., & Turlings, T. (2014). Chicks of the great spotted cuckoo may turn brood parasitism into mutualism by producing a foul-smelling secretion that repels predators. Journal of Chemical Ecology, 40(4), 320-324.
   
Type Article de périodique (Anglais)
Date de publication 4-2014
Nom du périodique Journal of Chemical Ecology
Volume 40
Numéro 4
Pages 320-324