Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/14123
Share/Impact:
Título : The Dusk Chorus from an Owl Perspective: Eagle Owls Vocalize When Their White Throat Badge Contrasts Most
Autor : Penteriani, Vincenzo, Delgado, María del Mar
Palabras clave : Dusk Chorus
Vocal display
Songbirds
Eagle
Owls
Fecha de publicación : 8-Apr-2009
Editor: Public Library of Science
Citación : PLoS ONE 4(4): e4960. (2009)
Resumen: [Background] An impressive number of studies have investigated bird vocal displays, and many of them have tried to explain the widespread phenomenon of the so-called dawn and dusk chorus, the sunrise and sunset peaks in bird song output. As many as twelve non-exclusive hypotheses have been proposed to explain why twilight peaks in vocal display might be advantageous; but, even after more than two decades of study, the basis underlying the dusk and dawn chorus is still unclear. Moreover, to date, the majority of studies on this topic have focused on songbirds.
[Methodology/Principal Findings] We investigate here a novel hypothesis on why nocturnal birds with patches of white feathers call at twilight. We propose that white plumage patches and the timing of visual signaling have co-evolved to maximize the effectiveness of social communication such as the dusk chorus. This hypothesis centers on the recent discovery that eagle owls can adopt specific forms of visual signaling and is supported by the observation that adult eagle owls possess a white throat badge that is only visible during vocal displays. By monitoring the calling of eagle owls at dusk, a peak time for bird call output, we found that white throat badges contrasted most with the surrounding background during the owls' twilight chorusing.
[Conclusions/Significance] Crepuscular and nocturnal species appear to have evolved white patches that, shown in association with vocal displays, allow them to communicate in dark surroundings. The evolution of a white badge that operates jointly with call displays at dawn and dusk may be relevant to the eagle owls' social dynamics. Our explanation for the dusk chorus may possibly represent an overlooked but common pattern of signaling among crepuscular and nocturnal birds that combine patches of white feathers with twilight displays. Furthermore, our findings could be relevant to songbirds that breed in dark forest habitats and have contrasting white badges, as well as birds living in open habitats and showing contrasting bars.
Descripción : 4 pages, 1 table, Figures S1 found at: doi:10.1371/journal.pone.0004960.s001 (1.58 MB DOC) and Video S1 found at: doi:10.1371/journal.pone.0004960.s002 (120.33 MB MPG)
Versión del editor: http://dx.doi.org/10.1371/journal.pone.0004960
URI : http://hdl.handle.net/10261/14123
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0004960
Citación : PLoS ONE 4(4): e4960. (2009)
Appears in Collections:(EBD) Artículos

Files in This Item:
File Description SizeFormat 
journal.pone.0004960.pdf78,79 kBAdobe PDFView/Open
Show full item record
 
CSIC SFX LinksSFX Query
Related articles:


Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.