| Titre : | Journal of Avian Biology 38(2) - MAR 2007 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Edward H. Miller, Auteur ;
Joni Williams, Auteur ;
Sarah E. Jamieson, Auteur ;
H. Grant Gilchrist, Auteur ;
Mark L. Mallory, Auteur
Intraspecific sexual differences, high variation, and positive allometry of sexually-selected external display structures are common. Many sexually-selected anatomical specializations occur in the avian vocal tract but intraspecific variation an[...]
Article
Erin R. Lindstedt, Auteur ;
Kevin P. Oh, Auteur ;
Alexander V. Badyaev, Auteur
Extrapair mating strategies are common among socially monogamous birds, but vary widely across ecological and social contexts in which breeding occurs. This variation is thought to reflect a compromise between the direct costs of mates' extrapai[...]
Article
Stephen C. Votier, Auteur ;
Stuart Bearhop, Auteur ;
Jonathan E. Crane, Auteur ;
Jose Manuel Arcos, Auteur ;
Robert W. Furness, Auteur
Competition for food is widely cited as an important cost of coloniality among birds and much of the evidence in support of this hypothesis comes from studies of colonial piscivorous seabirds. However, for generalist seabirds able to switch betw[...]
Article
Catherine Hambly, Auteur ;
Shai Markman, Auteur ;
Lizanne Roxburgh, Auteur ;
Berry Pinshow, Auteur
The timing of the chick-rearing phase is known to have a profound effect on the reproductive success of birds. However, little is known about the energetic costs faced by the parents during different periods of the breeding season. These costs m[...]
Article
Peter L. F. Fast, Auteur ;
H. Grant Gilchrist, Auteur ;
Robert G. Clark, Auteur
Evaluating consequences of habitat selection is an important step in understanding life history strategies and behavioural decisions of animals. Kilpi and Lindstrom (1997) found that incubating common eiders Somateria mollissima on exposed, tree[...]
Article
Katrina Hale, Auteur ;
James V. Briskie, Auteur
The loss of anti-parasite adaptations against the European cuckoo Cuculus canorus was studied in three European passerine species, song thrush Turdus philomelos, blackbird T. merula, and chaffinch Fringilla coelebs, introduced to New Zealand in [...]
Article
Kasper Thorup, Auteur ;
Jorgen Rabol, Auteur ;
Birgit Erni, Auteur
Among-individual variation in mean migration directions is the basis of evolution of new migration routes and has important consequences for our understanding of the migratory orientation system. This variation in migration directions is also of[...]
Article
Christopher M. Hofmann, Auteur ;
Thomas W. Cronin, Auteur ;
Kevin E. Omland, Auteur
Although many animals use carotenoids to produce bright yellow, orange, and red colors, an increasing number of studies have found that other pigments, such as melanins, may also be used to produce bright colors. Yet, almost nothing is known abo[...]
Article
Christopher M. Hofmann, Auteur ;
Kevin J. McGraw, Auteur ;
Thomas W. Cronin, Auteur ;
Kevin E. Omland, Auteur
Carotenoids produce the brilliant red, orange, and yellow colors of many animals. However, melanin pigments can also confer some of these same hues. Because carotenoid and melanin colors are produced in different ways and may serve different sig[...]
Article
Ron W. Summers, Auteur ;
Robert J. G. Dawson, Auteur ;
Ron E. Phillips, Auteur
There are three breeding taxa of crossbills in highland Scotland, the common crossbill Loxia curvirostra, parrot crossbill L. pytyopsittacus and endemic Scottish crossbill L. scotica. These taxa show no genetic differentiation in neutral DNA (mi[...]
Article
Antti Paasivaara, Auteur ;
Hannu Poysa, Auteur
The survival of common goldeneye Bucephala clangula ducklings during their first week of life was studied in relation to hatching date, brood size, female condition, and weather (temperature and precipitation) during the first week post-hatch by[...]
Article
Troy G. Murphy, Auteur
The racket-tipped tail of the motmots is uniquely shaped and its formation has attracted much attention. Barbs that grow along the wire of the motmot's two central tail feathers are weakly attached and shed soon after development. The cause of t[...]
Article
Philip D. Round, Auteur ;
Bengt Hansson, Auteur ;
David J. Pearson, Auteur ;
Peter R. Kennerley, Auteur ;
Staffan Bensch, Auteur
We present compelling evidence of the continued existence of the large-billed reed warbler Acrocephalus orinus, hitherto known only from the unique type specimen collected in NW India 139 years ago. Morphological and genetic analyses of an unusu[...]
