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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/31142

Title: Armed Rollers: Does Nestling’s Vomit Function as a Defence against Predators?
Authors: Parejo, Deseada
Avilés, Jesús M.
Peña, Aránzazu
Sánchez, Lourdes
Ruano Díaz, Francisca
Zamora-Muñoz, Carmen
Martín-Vivaldi, Manuel
Issue Date: 2013
Abstract: Chemical defences against predators are widespread in the animal kingdom although have been seldom reported in birds. Here, we investigate the possibility that the orange liquid that nestlings of an insectivorous bird, the Eurasian roller (Coracias garrulus), expel when scared at their nests acts as a chemical defence against predators. We studied the diet of nestling rollers and vomit origin, its chemical composition and deterrent effect on a mammal generalist predator. We also hypothesized that nestling rollers, as their main prey (i.e. grasshoppers) do from plants, could sequester chemicals from their prey for their use. Grasshoppers, that also regurgitate when facing to a threat, store the harmful substances used by plants to defend themselves against herbivores. We found that nestling rollers only vomit after being grasped and moved. The production of vomit depended on food consumption and the vomit contained two deterrent chemicals (hydroxycinnamic and hydroxybenzoic acids) stored by grasshoppers and used by plants to diminish herbivory, suggesting that they originate from the rollers’ prey. Finally, we showed for the first time that the oral secretion of a vertebrate had a deterrent effect on a model predator because vomit of nestling rollers made meat distasteful to dogs. These results support the idea that the vomit of nestling rollers is a chemical defence against predators.
Sponsorship: Financial support was provided by the Junta de Andalucía (project P06-RNM-02177) and the Spanish Ministry of Science and Education/FEDER (projects CGL2008-00718 and CGL2011-27561).
Publisher: Public Library of Science (PLOS)
Keywords: Birds
Plant defenses
Plant-herbivore interactions
URI: http://hdl.handle.net/10481/31142
ISSN: 1932-6203
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Parejo, D.; et al. Armed Rollers: Does Nestling’s Vomit Function as a Defence against Predators?. Plos One, 8(7): e68862 (2013). [http://hdl.handle.net/10481/31142]
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