PSYCH 3T03 Chapter 7: PSYCH3T03- (7) Mouth Colour is a Reliable Signal of Need in Begging Canary Nestlings
13 Apr 2018
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Document Summary
Article 7: mouth colour is a reliable signal of need in. Mouth colour signals need in nestlings; changes in mouth colour accurately re ect nestling"s state of need (i. e. more intense colour is proportional to greater need) Of two birds, the one with an arti cially reddened mouth was provided more food by parents. Note: this paper contains personal communications and observations. Begging display: bright mouth colouration; begging postures; loud calls: cons: costly; attracts predators. Begging creates a signalling equilibrium which resolves parent-o spring con ict over resource distribution and then, provides information on o spring condition. Honest signalling models of o spring solicitation yield three key predictions : begging intensity should re ect o spring need, parents should provision young in relation to begging intensity, begging should be costly. Note: past work has shown chick begging posture and calling are known to change reliably in short-term with recent feeding experience.
