| Titre : | Journal of Avian Biology 34(4) - DEC 2003 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
P. Sunde, Auteur ;
M. S. Bolstad, Auteur ;
K. B. Desfor, Auteur
Tawny owls Strix aluco generally roost in cryptic locations during the day. To test the hypothesis that this cryptic behaviour is an effort to avoid mobbers or avian predators, we measured diurnal behaviour and cause-specific mortality of radio-[...]
Article
M. D. Shawkey, Auteur ;
S. R. Pillai, Auteur ;
G. E. Hill, Auteur
Anti-microbial activity is a commonly suggested but rarely tested property of avian uropygial oil. Birds may defend themselves against feather-degrading and other potentially harmful bacteria using this oil. We preliminarily identified 13 bacter[...]
Article
C. Eikenaar, Auteur ;
M. L. Berg, Auteur ;
J. Komdeur, Auteur
The amount of time a bird allocates to incubation is likely to be limited by energetic constraints. If food is abundant, energetic constraints may be reduced and the time spent incubating (incubation attendance) may increase. Moreover, the onset[...]
Article
T. D. Williams, Auteur ;
J. K. Christians, Auteur
Reproductive performance varies with age in a wide range of organisms, and increasingly such patterns are interpreted in terms of state-dependent models. We sought to characterise 'state' with regards to age-related variation in clutch size, egg[...]
Article
J. Bertran, Auteur ;
A. Margalida, Auteur
Male-male mountings appear to be very common in polyandrous bearded vulture Gypaetetus barbatus trios. We observed sexual activity in two trios that occupied the same territory in different years. We recorded a total of 167 copulation attempts. [...]
Article
J. T. Garcia, Auteur
investigated whether plumage features are sufficient for species recognition in two sibling sympatric raptor species: the Montagu's harrier Circus pygargus and the hen harrier C. cyaneus. These species are similar in body size and differ slightl[...]
Article
M. E. Hauber, Auteur ;
C. K. Ramsey, Auteur
Nestling parasites typically beg more intensively than do host nestlings yet these exaggerated displays are also honest in that they are modulated by hunger and age. We hypothesized that honesty was also maintained in the food solicitation behav[...]
Article
J. Jones, Auteur ;
C. M. Francis, Auteur
The generation of artificial light by human activity can have far-reaching detrimental impacts upon a wide variety of organisms. A great deal of attention has been paid to well-lit buildings, television towers, and communication towers as source[...]
Article
A. Roulin, Auteur ;
B. Ducret, Auteur ;
P. A. Ravussin, Auteur ;
R. Altwegg, Auteur
Variation in coloration with a strong underlying genetic basis is frequently found in birds, insects, anurans, molluscs and plants. Although such a variation can be large, little is known about its functional value. Correlative data, however, ca[...]
Article
Article
R. B. Smith, Auteur ;
T. D. Meehan, Auteur ;
B. O. Wolf, Auteur
Intraspecific migration patterns in birds have both spatial and temporal components. Two commonly reported spatial patterns are leap-frog and chain migration. Temporal migration patterns refer to the timing of migration of populations from diffe[...]
Article
J. V. Remsen, Auteur
Article
E. V. Williams, Auteur ;
J. P. Swaddle, Auteur
The effects of natural moult on avian flight performance have received relatively little attention, yet moult is an important part of the annual cycle. Quantification of flight costs will help to explain the diversity of moult patterns observed [...]
Article
K. J. Burns, Auteur ;
S. J. Hackett, Auteur ;
N. K. Klein, Auteur
Phylogenetic relationships among Neotropical honeycreepers were studied by using cytochrome b sequence data. Although honeycreepers were once placed in their own family (Coerebidae), these species did not form a monophyletic group in any of the [...]
Article
M. Cichon, Auteur ;
A. Dubiec, Auteur ;
M. Stoczko, Auteur
According to sex allocation theory, females may benefit from a differential investment in sons and daughters, where fitness returns from male and female offspring vary. One way in which investment may be differentiated is by assigning male and f[...]
Article
Olav Hogstad, Auteur ;
Vidar Selås, Auteur ;
Sverre Kobro, Auteur
In a subalpine birch forest in Central Norway, the breeding population of fieldfare Turdus pilaris varied from 3 to 63 pairs per km2 during 1966-2000. For the period 1971-1995, the breeding density was negatively related to the number of days wi[...]
Article
Article
A. Hogstad, Auteur ;
V. Selas, Auteur ;
S. Kobro, Auteur
In a subalpine birch forest in Central Norway, the breeding population of fieldfare Turdus pilaris varied from 3 to 63 pairs per km(2) during 1966-2000. For the period 1971-1995, the breeding density was negatively related to the number of days [...]
