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- W2078072016 abstract "According to honest signalling theory, signals must be costly to produce to retain information about the signaller's quality. The song produced by male birds during breeding is a vocal ornament used for intra- and inter-sexual purposes. The energetic cost of this vocal signal remains a contentious issue. We used the doubly labelled water method to measure field metabolic rate by estimating CO2 production and then convert this to daily energy expenditure (DEE) in great reed warbler males singing under natural conditions (10 at low to moderate intensity and 7 at very high intensity from dawn to dusk). There was a significant positive relationship between singing intensity and DEE. From this relationship we extrapolated the average DEE for intensely singing males (i.e., males producing song sounds 50% of the time and hence sitting at their elevated song post in the top of a reed stem more or less continuously throughout the similar to 20 h of daylight) to 3.3xBMR (basal metabolic rate) and for non-singing males to 2.2xBMR. The mean DEE measured for the seven males singing with very high intensity was 3.1xBMR. The maximum measured DEE for a single male was 3.9xBMR, i.e. close to the maximum sustainable DEE (4xBMR), and the minimum DEE was 2.1xBMR for a male singing at very low intensity. These results imply that producing intensive advertising song in birds may incur a substantial cost in terms of increased energy expenditure. (Less)" @default.
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- W2078072016 date "2008-07-01" @default.
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- W2078072016 title "Daily energy expenditure of singing great reed warblers<i>Acrocephalus arundinaceus</i>" @default.
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- W2078072016 doi "https://doi.org/10.1111/j.0908-8857.2008.04427.x" @default.
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