| Titre : | Effect of alarm calling by male Red-winged Blackbirds on nestling begging and female provisioning behavior |
| Auteurs : | Jacy Bernath-Plaisted, Auteur ; Ken Yasukawa, Auteur |
| Type de document : | Article |
| Dans : | Journal of Field Ornithology (82(4) DEC 2011) |
| Article en page(s) : | 395-405 |
| Langues: | Anglais |
| Résumé : | Nestling begging and parental provisioning can attract nest predators and reduce reproductive success, so parents and their offspring might be expected to respond adaptively by minimizing predator-attracting cues when predators threaten nests. Male Red-winged Blackbirds (Agelaius phoeniceus) are well known for their antipredator alarm calls that contain information about the approach of potential nest predators. We examined the begging behavior of nestlings and the provisioning behavior of females in response to antipredator alarm calls of males to test the adaptive response hypothesis. Playback experiments provided no evidence that alarm calls function to switch off vocal begging; nestlings were equally likely to beg vocally during playback and control periods. Video recordings showed that male alarm calling had no significant effect on inappropriate vocal begging (in the absence of an adult), but significantly reduced the incidence of spontaneous calling (in the absence of begging). Adult females responded to male antipredator alarm calls by delaying their provisioning visits. In addition, although having no significant effect on use of nest-arriving calls by females, male alarm calling significantly reduced their use of nest-leaving calls. We conclude that nestling and female Red-winged Blackbirds respond to male alarm calls in ways that might reduce the risk of predation, but nestlings beg vocally when females arrive to feed them, regardless of male alarm calling, perhaps to avoid a competitive disadvantage with broodmates. |
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