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- W2124271486 abstract "Many songbirds are discontinuous singers with a relatively small repertoire of song types. They repeat each song type a variable number of times in a song bout with pauses between each strophe, before they switch to another song type. It was first described in great tits Parus major that song output declines over time when a male sings a particular song type. This phenomenon is referred to as drift and it is mainly caused by an increase in the pauses between strophes. Drift can be explained either by neuro-muscular exhaustion or by a decline in motivation to sing. We studied the occurrence of drift during a period of high song output (the dawn chorus) in the blue tit P. caeruleus. Drift occurred in 31% of 104 recorded song bouts. Most males significantly increased their song output again after switching to another song type. Some evidence suggests that drift in great and blue tits might be used by females as a cue reflecting male or territory quality. The anti-exhaustion hypothesis predicts that males that have a larger repertoire size should show less drift, because they can switch more frequently to other song types and thus avoid neuro-muscular exhaustion. Our data on 20 blue tit males provide at best weak evidence for this hypothesis. However, the prediction can also be tested at the interspecific level, although data on more species are needed. Great tits have the smallest repertoires and the highest levels of drift, while coal tits P. ater have the largest repertoires and drift is very rare." @default.
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- W2124271486 date "2000-01-01" @default.
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- W2124271486 title "When a bird is tired from singing: a study of drift during the dawn chorus" @default.
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