| Titre : | Journal of Avian Biology 36(2) - MAR 2005 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
S. B. Smith, Auteur ;
M. S. Webster, Auteur ;
R. T. Holmes, Auteur
Although extra-pair fertilizations (EPF) are common in socially monogamous systems, the benefits to females remain elusive. One potential benefit that recently has begun to receive empirical attention is increased offspring heterozygosity. We te[...]
Article
Y. Tremblay, Auteur ;
Y. Cherel, Auteur
As seabirds are central place foragers during breeding, their provisioning behaviour and their ability to face variable energy demand from the chicks is expected to vary with environmental conditions. The provisioning behaviour of female rockhop[...]
Article
R. D. Dawson, Auteur ;
M. T. Bidwell, Auteur
Much previous research has focussed on the role of food supply in determining the growth and the survival of avian offspring. More recently, acid deposition in some ecosystems has demonstrated that in addition to energy, birds also need to acqui[...]
Article
Cormorants are assumed to have a "partially wettable" plumage as a mechanism to reduce buoyancy while swimming underwater. This assumption is mainly based on 3 observations: 1) the volume of air in the plumage of submerged carcasses is small com[...]
Article
R. J. Smith, Auteur ;
F. R. Moore, Auteur
Many long-distance passerine migrants arrive with more fat stores than necessary to have reached their northerly breeding grounds. Researchers have argued for adaptive advantages associated with arriving with 'surplus' migratory fat, including i[...]
Article
M. Muchai, Auteur ;
M. A. du Plessis, Auteur
Alexander Skutch predicted that nest predation will increase with activity at nests, and that predation should be greatest during the nestling stage when parents are feeding young. We tested this hypothesis using three ecologically similar grass[...]
Article
M. L. Berg, Auteur ;
N. H. Beintema, Auteur ;
J. A. Welbergen, Auteur ;
J. Komdeur, Auteur
Bird song is generally regarded as a sexually selected trait, and may represent a reliable handicap signal under at least certain conditions. Females may use the degree of male song production as a reliable cue to male condition or territory qua[...]
Article
R. G. Moyle, Auteur ;
M. Schilthuizen, Auteur ;
M. A. Rahman, Auteur ;
F. H. Sheldon, Auteur
Comparison of 1017 nucleotides of mitochondrial ND2 and ND3 DNA sequences of 26 individuals of white-crowned forktail Enicurus leschenaulti from SE Asia revealed multiple evolutionary lineages within Borneo. Montane birds were genetically homoge[...]
Article
D. R. Norris, Auteur ;
P. P. Marra, Auteur ;
T. K. Kyser, Auteur ;
L. M. Ratcliffe, Auteur
The successful use of stable isotopes to track migratory animals between different seasons of the annual cycle depends, in part, on the turnover rate of isotopes in sample tissue. We examined whether stable-carbon isotopes in the blood of a long[...]
Article
D. F. Mazerolle, Auteur ;
K. W. Dufour, Auteur ;
K. A. Hobson, Auteur ;
H. E. den Haan, Auteur
Migrant songbirds are vulnerable to changes in climatic conditions on both the breeding and wintering grounds. For North American Neotropical migrants, the El Nino/Southern Oscillation (ENSO), via its effects on global precipitation and temperat[...]
