| Titre : | Journal of Avian Biology 30(4) - DEC 1999 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
T. Wesolowski, Auteur
In contrast to other organisms with internal fertilization, males of the majority of birds do not possess a copulatory organ. Causes of this loss of phallus are not well understood. Copulations in birds are very short, indicating selection for f[...]
Article
A. Takahashi, Auteur ;
M. Kuroki, Auteur ;
Y. Niizuma, Auteur ;
Y. Watanuki, Auteur
The effects of offspring food demand on the regulation of parental food provisioning were examined in the Rhinoceros Anklet Cerorhincha monocerata, a nocturnal single-provisioning species, by conducting mate removal and supplementary feeding exp[...]
Article
B. K. Sandercock, Auteur ;
D. B. Lank, Auteur ;
F. Cooke, Auteur
The breeding biology of Western and Semipalmated Sandpipers was studied for four years near Nome, Alaska. Despite a short breeding season and a putatively invariant clutch size. there were seasonal declines in the fecundity of both sandpiper spe[...]
Article
J. Graveland, Auteur
The management of reedbeds for birds is often a controversial issue in discussions between conservationists, reed harvesters and managers. At the same time, data on the density and nesting success of birds in cut and uncut reed are scarce. This [...]
Article
A. Gosler, Auteur ;
T. Carruthers, Auteur
We studied the interactions between;weather, social dominance and body condition (fat and protein reserves) In a colour-ringed population of the Great Tit in the Killarney National Park, Rep. of Ireland in two mild winters (1990 and 1992) differ[...]
Article
J. G. Bojarinova, Auteur ;
E. Lehikoinen, Auteur ;
T. Eeva, Auteur
We examined the influence of hatching date, nestling condition (body mass), size and sex on the age at the onset, and on the duration and extent of postjuvenile moult in a Great Tit population in southern Finland. Date of hatching explained most[...]
Article
D. E. Chamberlain, Auteur ;
R. J. Fuller, Auteur
For many species, distribution across different habitats may be a dynamic process affected by population size and the position of individual habitats on the continuum of habitat quality from most preferred to least preferred. Species that exhibi[...]
Article
T. P. Weber, Auteur ;
A. I. Houston, Auteur ;
B. J. Ens, Auteur
We use a dynamic optimization model to assess the consequences of habitat loss at migratory stopover sites. We emphasize costs birds Fare during stopover (e.g. costs of gaining energy), the timing of site use and the behavioural rules birds migh[...]
Article
S. S. Walls, Auteur ;
S. Manosa, Auteur ;
R. M. Fuller, Auteur ;
K. H. Hodder, Auteur ;
R. E. Kenward, Auteur
In order to test whether Common Buzzards Buteo buteo that dispersed early were entrepreneurs or exiles, we determined standardised autumn ranges by radio-tracking 67 juveniles during 1990-94. Of these, 11 had dispersed more than 2 km from their [...]
Article
J. Bried, Auteur ;
P. Jouventin, Auteur
In long-lived birds, reproductive performance is considered to increase with breeding experience, influencing site and mate retention. However, breeding success also depends on external factors. We therefore increased experimentally the breeding[...]
Article
P. Catry, Auteur ;
R. W. Furness, Auteur
Territorial or nest attendance by adult breeding seabirds is often essential to prevent egg or chick mortality. As a result, parent birds, when not engaged in foraging trips, should stay on their territories whenever there is a risk from leaving[...]
Article
V. Tilgar, Auteur ;
R. Mand, Auteur ;
A. Leivits, Auteur
Recent studies have demonstrated that wild birds breeding in acidified areas may have difficulties in obtaining sufficient calcium for their eggshells, and that a shortage of land snails may be the cause. Here we present experimental evidence th[...]
Article
P. Drapeau, Auteur ;
A. Leduc, Auteur ;
R. Mcneil, Auteur
Useful sampling guidelines have recently been provided to improve the precision of bird population parameter estimates from point count data. Less attention has been given, however, to the issue of accuracy or completeness of counts at each samp[...]
Article
M. Rosen, Auteur ;
A. Hedenstrom, Auteur ;
A. Badami, Auteur ;
F. Spina, Auteur ;
S. Akesson, Auteur
The Eleanora's Falcon Falco eleonorae breeds on islands and islets in the Mediterranean region and feeds its young on migratory birds caught in the air. The breeding season is scheduled to coincide with the peak of bird migration. Between IZ and[...]
Article
P. T. Rintamaki, Auteur ;
E. Karvonen, Auteur ;
R. V. Alatalo, Auteur ;
A. Lundberg, Auteur
Studies of sexual selection have focused mainly on explanations of how male characteristics influence mating success during the breeding season. By contrast, few studies have investigated how behaviours prior to the breeding season influence mat[...]
Article
J. L. Osorno, Auteur
Timing of offspring desertion is expected to be the outcome of the trade-off between current and future reproductive benefits for deserters. I investigated this idea by analysing the timing of male desertion in the Magnificent Frigatebird Fregat[...]
Article
J. P. Swaddle, Auteur ;
E. V. Williams, Auteur ;
J. M. V. Rayner, Auteur
We investigated the effects of the plumage changes associated with moult on the anti-predator take-off performance of European Starlings Sturnus vulgaris. By altering the plumage to simulate moult, we have isolated the biomechanical consequences[...]
