| Titre : | Journal of Avian Biology 38(6) - NOV 2007 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Paolo Galeotti, Auteur ;
Diego Rubolini, Auteur
We studied head ornamentation in owls by focussing on the hypothesis that it may serve both intra- and interspecific communication. We carried out pairwise comparisons of morphological, ecological and behavioural traits on a subset of closely re[...]
Article
Variation in the hematocrit of a passerine bird across life stages is mainly of environmental origin
Jaime Potti, Auteur
The heritability of the hematocrit in adult, breeding pied flycatchers Ficedula hypoleuca is examined in a southern European population across seven years to see the consistency, or lack thereof, of patterns found with the trait at fledgling age[...]
Article
Jesus M. Aviles, Auteur ;
Peter A. Bednekoff, Auteur
Animals often spend less time vigilant and more time feeding when foraging in larger groups. This group-size effect does not, however, consider if larger groups differ systematically from smaller ones: Large groups could form in different habita[...]
Article
David Westmoreland, Auteur ;
Richard A. Kiltie, Auteur
High variation in egg coloration among birds has traditionally been explained as adaptation for camouflage. We tested this hypothesis by conducting reciprocal clutch exchanges (n=301) among Brewer's blackbirds Euphagous cyanocephalus, red-winged[...]
Article
Paola Laiolo, Auteur ;
Matthias Voegeli, Auteur ;
David Serrano, Auteur ;
José L. Tella, Auteur
Individuals of some species differentiate each other on the basis of the acoustic features of their vocalizations, and this can be used in individual-based population monitoring studies. No research has tested for the effectiveness of individual[...]
Article
Deseada Parejo, Auteur ;
Nadia Silva, Auteur ;
Jesus M. Aviles, Auteur
The immune system has a crucial importance determining animal health and survival. Its maintenance and activation are costly and usually trade with other physiologically costly functions. In birds, number and size of siblings in a nest are likel[...]
Article
Kate L. Durrant, Auteur ;
Jennifer L. Reed, Auteur ;
Peter J. Jones, Auteur ;
Martin Dallimer, Auteur ;
Robert A. Cheke, Auteur ;
Andrew N. McWilliam, Auteur ;
Robert C. Fleischer, Auteur
The red-billed quelea Quelea quelea, one of the most abundant birds in the world, presents two fundamental conundrums that we investigate here with a novel approach using blood parasite assemblages at two spatial scales, landscape and individual[...]
Article
Renee D. Godard, Auteur ;
Morgan Wilson, Auteur ;
Jessica W. Frick, Auteur ;
Paul B. Siegel, Auteur ;
Bonnie B. Bowers, Auteur
Many avian species initiate incubation before clutch completion, resulting in an asynchronous hatch of their eggs. Several studies suggest that early laid eggs in birds that exhibit synchronous hatching may be more vulnerable to the negative imp[...]
Article
Gergely Hegyi, Auteur ;
Beata Szigeti, Auteur ;
Janos Toeroek, Auteur ;
Marcel Eens, Auteur
The importance of plumage colour as an indicator of individual quality and the basis of sexual selection has long been recognized. Of the three generally distinguished classes of plumage colours, melanin-based ornaments are traditionally conside[...]
Article
Tore Slagsvold, Auteur ;
Geir A. Sonerud, Auteur
Compared to other birds, most raptors take large prey for their size, and feeding bouts are extended. However, ingestion rate has largely been overlooked as a constraint in raptors' foraging and breeding ecology. We measured ingestion rate by of[...]
Article
Tomasz S. Osiejuk, Auteur ;
Katarzyna Losak, Auteur ;
Svein Dale, Auteur
Several studies demonstrated that bird song functions as a first line of territorial defence. The efficiency of deterring rivals depends strongly on the strategy of singing used (e.g. alternating/overlapping singing, singing with low/high rate, [...]
Article
For over a half century numerous hypotheses have surfaced aimed at explaining a key life history trait, the evolution of clutch size in birds. A principal goal has been to explain why clutch size generally increases with latitude both within spe[...]
