Mobbing Behaviour, Nest Exposure, and Breeding Success in the American Robin

in Behaviour
Restricted Access
Get Access to Full Text
Rent on DeepDyve

Have an Access Token?



Enter your access token to activate and access content online.

Please login and go to your personal user account to enter your access token.



Help

Have Institutional Access?



Access content through your institution. Any other coaching guidance?



Connect

Abstract

We tested some costs and benefits associated with variable levels of mobbing response towards nest predators by American robins. Playbacks of robin mobbing calls attracted a major predator of robin nests, the northwestern crow. This demonstrates a potential cost to robins that give mobbing calls. We then used human 'predators' to test whether reproductive success was related to mobbing intensity. We first showed that mobbing responses to humans resembled those shown to a stuffed crow. Second, we demonstrated that responses of pairs of robins were consistent at different tests at the same nest, but were less consistent between different nesting attempts of the same pair. The first result validates our experimental procedure, but the second result suggests that variation in mobbing response is partly determined by characteristics of the nest or nest site, rather than by the level of aggressiveness of the parents. When we compared mobbing responses by robins at exposed and well-concealed nests, robins with exposed nests used extreme responses (swoops and hits) more frequently than those with concealed nests. We did not, however, find an consistent relationship between mobbing intensity, stage of the nestling cycle, or reproductive success. Robins did not respond more strongly late in the nesting cycle, and pairs that responded weakly, or strongly, experienced similar levels of nesting success.

Mobbing Behaviour, Nest Exposure, and Breeding Success in the American Robin

in Behaviour

Sections

Index Card

Content Metrics

Content Metrics

All Time Past Year Past 30 Days
Abstract Views 11 11 8
Full Text Views 6 6 6
PDF Downloads 4 4 4
EPUB Downloads 0 0 0