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Daily energy expenditure of singing great reed warblers Acrocephalus arundinaceus

In English

Författare

Summary, in English

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.

Publiceringsår

2008

Språk

Engelska

Sidor

384-388

Publikation/Tidskrift/Serie

Journal of Avian Biology

Volym

39

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Biological Sciences

Status

Published

Projekt

  • Long-term study of great reed warblers

Forskningsgrupp

  • Molecular Ecology and Evolution Lab

ISBN/ISSN/Övrigt

  • ISSN: 0908-8857