| Titre : | Journal of Avian Biology 39(4) - JUL 2008 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Anders Kjaersgaard, Auteur ;
Cino Pertoldi, Auteur ;
Volker Loeschcke, Auteur ;
Dan Witzner Hansen, Auteur
Accurate measurements of what birds are looking at are valuable to most studies of vision and visually guided behaviour in avian species. Compared to human visual research, studies of gaze behaviour in birds are limited. A new laser-based method[...]
Article
Joseph A. M. Smith, Auteur ;
Leonard R. Reitsma, Auteur ;
Larry L. Rockwood, Auteur ;
Peter P. Marra, Auteur
Several species of Nearctic-Neotropical migratory songbirds appear to form roosting aggregations while on their wintering grounds but little is understood about the ecology of this behavior. We studied roosting behavior and patterns of roost hab[...]
Article
Pierre-Paul Bitton, Auteur ;
Russell D. Dawson, Auteur
Age-related differences in plumage characteristics of birds can be the result of differential survival of more ornamented individuals, within-individual changes in plumage attributes with age, or a combination of both. In this study, we investig[...]
Article
David Costantini, Auteur ;
Luigi Racheli, Auteur ;
Delia Cavallo, Auteur ;
Giacomo Dell'Omo, Auteur
Several hypotheses have been proposed to explain genome size variation in birds. However, no general consensus has been reached thus far. In this study, we analysed the inter- and intraspecific variation of genome size in some parrot species, an[...]
Article
Rebecca T. Kimball, Auteur ;
Edward L. Braun, Auteur
Many species in the avian order Galliformes have bare (or "fleshy") regions on their head, ranging from simple featherless regions to specialized structures such as combs or wattles. Sexual selection for these traits has been demonstrated in sev[...]
Article
Liv Wennerberg, Auteur ;
Gunnhild Marthinsen, Auteur ;
Jan T. Lifjeld, Auteur
Breeding populations of southern dunlin Calidris alpina schinzii in South Fennoscandia and the Baltic are severely fragmented and declining dramatically. Information on the genetic structure and diversity is therefore of importance for the conse[...]
Article
Rita Hargitai, Auteur ;
Márton Herényi, Auteur ;
János Török, Auteur
The blue-green eggshell pigment biliverdin is an efficient antioxidant, the deposition of which may be costly and act as a handicap to the female's antioxidant capacity. Thus, it is hypothesized that there exists a positive correlation between t[...]
Article
Yves Hingrat, Auteur ;
Michel Saint Jalme, Auteur ;
Toni Chalah, Auteur ;
Nicolas Orhant, Auteur ;
Frederic Lacroix, Auteur
Habitat selection is a hierarchical process where the distribution of individuals is constrained by environmental factors acting from the landscape scale to specific microhabitats such as breeding sites. However, interactions between conspecific[...]
Article
Carlos B. Zavalaga, Auteur ;
Silvano Benvenuti, Auteur ;
Luigi Dall'Antonia, Auteur ;
Steven D. Emslie, Auteur
The association between the distribution of blue-footed boobies Sula nebouxii (BFB) and marine productivity around their breeding grounds is unclear. In Peru, they breed in a region seasonally influenced by the cold, nutrient rich Humboldt Curre[...]
Article
Amanda R. Ridley, Auteur ;
Nichola J. Raihani, Auteur ;
Martha J. Nelson-Flower, Auteur
The occurrence of group-living behaviour has often been explained by the benefits individuals receive through cooperation; including increased reproductive output, vigilance against predators, and load-lightening behaviour. However, to fully und[...]
Article
Dennis Hasselquist, Auteur ;
Staffan Bensch, Auteur
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 en[...]
Article
Jinelle H. Sperry, Auteur ;
Rebecca G. Peak, Auteur ;
David A. Cimprich, Auteur ;
Patrick J. Weatherhead, Auteur
Variation in predator behavior has been proposed, but not tested, as a mechanism producing seasonal declines in avian nest success. We test this hypothesis by documenting seasonal activity of Texas ratsnakes Elaphe obsoleta and nest failure of e[...]
Article
Lani D. Sheldon, Auteur ;
Eunice H. Chin, Auteur ;
Sharon A. Gill, Auteur ;
Gregory Schmaltz, Auteur ;
Amy E. M. Newman, Auteur ;
Kiran K. Soma, Auteur
Blood sampling is often critical for answering a variety of questions about wild birds. However, it is important to assess the impacts, if any, of blood collection on wild birds. Here, we examined the effects of blood sampling on adults or nestl[...]
