| Titre : | Journal of Avian Biology 33(2) - JUN 2002 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
S. R. de Kort, Auteur ;
P. M. den Hartog, Auteur ;
C. ten Cate, Auteur
Sympatric occurrence of two closely related species is expected to lead to diverging or converging shifts in signal characteristics of one or both species. We examined signal characteristics in the vinaceous dove Streptopelia vinacea and the rin[...]
Article
P. A. Bednekoff, Auteur ;
S. L. Lima, Auteur
Anti-predator vigilance describes how animals scan their environments for predators. For mathematical simplicity, theories of anti-predator vigilance have generally assumed that animals initiate scans with a constant probability for each unit of[...]
Article
N. Verboven, Auteur ;
M. Kakela, Auteur ;
M. Orell, Auteur
When the timing of breeding affects the reproductive value of sons and daughters differently, parents are expected to increase their fitness by changing the offspring sex ratio during the course of the breeding season, Previous studies have show[...]
Article
V. A. Gill, Auteur ;
S. A. Hatch, Auteur
In contrast to the high productivity of black-legged kittiwakes in Britain, kittiwakes at many colonies in Alaska have failed chronically to reproduce since the mid 1970s. To determine if food is limiting productivity and, if so, at what stages [...]
Article
T. C. Grubb, Auteur
Article
H. Siitari, Auteur ;
J. Viitala, Auteur
In addition to wavelengths visible to humans (400-700 nm), many birds are able to detect near ultraviolet light (320-400 nm). Most studies of ultraviolet (UV) vision in birds have concentrated on the importance of
Article
M. J. Whittingham, Auteur ;
S. M. Percival, Auteur ;
A. F. Brown, Auteur
It is widely known that many upland-breeding shorebirds tend to nest on plateaus but to date no studies have put forward explanations for this phenomenon. We examined the effect of slope and habitat on the distribution of ground-nesting golden p[...]
Article
S. Brodeur, Auteur ;
J. P. L. Savard, Auteur ;
M. Robert, Auteur ;
P. Laporte, Auteur ;
P. Lamothe, Auteur ;
R. D. Titman, Auteur ;
S. Marchand, Auteur ;
S. Gilliland, Auteur ;
G. Fitzgerald, Auteur
During May 1996 and April 1997, eight harlequin duck males were captured and fitted with satellite transmitters while migrating along the shores of Forillon National Park, Quebec, Canada. Another 17 males were equipped with satellite transmitter[...]
Article
J. Bonlokke-Pedersen, Auteur ;
J. Drachmann, Auteur ;
J. Frydenberg, Auteur ;
J. J. Boomsma, Auteur
Microsatellite analysis was used to analyse the level of extra-pair paternity (EPP) in the semi-colonially breeding linnet Carduelis cannabina in Denmark. During the breeding seasons of 1998 and 1999 EPP accounted for only 3.8% of young (4/106, [...]
Article
R. M. Zink, Auteur ;
S. V. Drovetski, Auteur ;
S. Rohwer, Auteur
We sequenced parts of three mitochondrial genes in 67 great spotted woodpeckers Dendrocopos major taken from 17 sites across Eurasia and Japan. Two groups, differing by ca. 3% sequence divergence, were determined to have had independent evolutio[...]
Article
J. C. Coulson, Auteur
Article
M. A. Gunness, Auteur ;
P. J. Weatherhead, Auteur
Studies of avian nest defense generally explain only a small proportion of the total variation in defense behavior. We explored two potential methodological sources of variation in nest defense in three species of ducks. One common method of qua[...]
Article
S. R. McWilliams, Auteur ;
S. B. Kearney, Auteur ;
W. H. Karasov, Auteur
During energy-demanding periods of the annual cycle such as migration or during cold days in winter, birds store fat comprised mostly of 16- or 18-carbon unsaturated fatty acids. In such situations, birds may feed selectively on foods with speci[...]
Article
C. Kullberg, Auteur ;
N. B. Metcalfe, Auteur ;
D. C. Houston, Auteur
During the breeding season, many female passerine birds increase in body mass before egg laying, maintain a relatively high body mass during incubation, and then drop back to the original level during the chick-rearing period. The post-hatching [...]
Article
S. Legge, Auteur
I examined the growth of surviving nestlings in broods of the cooperatively breeding laughing kookaburra Dacelo novaeguineae, which has complex patterns of brood reduction. Laughing kookaburras usually lay three eggs that hatch asynchronously. B[...]
