English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/60695
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Structural Variations in the Begging Calls of Nestling Magpies Pica pica and their Role in the Development of Adult Voice

AuthorsRedondo, T. ; Expósito, Francisco
Issue DateDec-1990
PublisherBlackwell Publishing
CitationEthology, 84:307-318 (1990)
AbstractLike most corvids, adult magpies (Pica pica) have harsh vocal repertoires characterized by a wide distribution of energy over the frequency scale. Shortly after hatching, begging calls of magpie nestlings have a tonal quality but become increasingly noisier as they develop. The appearance of harsh structures in the calls is closely related to a process of frequency modulation which ends at about 16–18 days. At this age, nestlings suddenly develop genuine harsh calls, typical of fledglings and adult birds. During development, similarities can be observed between frequency modulation and noise production, suggesting that nestlings acquire the ability to produce adult harsh vocalizations by modulating their begging calls. This hypothesis does not explain, however, why genuine harsh calls develop without transitional forms being evident in the preceding begging calls. Also, intra- and interspecific differences in modulation rates do not cause differences in noise production in the way that this hypothesis would at first suggest. Frequency modulation and noise production do not seem to be involved in the ontogeny of the adult voice. It is suggested that both features contribute to call degradation in the environment, in order to compensate for the increasing risks of nests being detected by predators due to the more detectable calls of older nestlings
Publisher version (URL)http://dx.doi.org/10.1111/j.1439-0310.1990.tb00805.x
URIhttp://hdl.handle.net/10261/60695
DOI10.1111/j.1439-0310.1990.tb00805.x
Appears in Collections:(EBD) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


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