| Titre : | Journal of Avian Biology 34(2) - JUN 2003 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
T. E. Steeves, Auteur ;
D. J. Anderson, Auteur ;
H. McNally, Auteur ;
M. H. Kim, Auteur ;
V. L. Friesen, Auteur
We examined mitochondrial cytochrome b sequence variation in masked Sula dactylatra, red-footed S. sula, and brown S. leucogaster boobies sampled from islands in the central and eastern Pacific Ocean and in the Caribbean Sea. Each species showed[...]
Article
U. S. Johansson, Auteur ;
P. G. P. Ericson, Auteur
Woodpeckers, honeyguides, barbets, and toucans form a well-supported clade with approximately 355 species. This clade, commonly referred to as Pici, share with the South American clade Galbulae (puffbirds and jacamars) a zygodactyls foot with a [...]
Article
E. H. Bucher, Auteur ;
D. Tamburini, Auteur ;
A. Abril, Auteur ;
P. Torres, Auteur
Plantcutters (Phytotomidae) represent the only Passeriforines with a predominantly folivorous diet. Little is known however about their feeding habits and adaptations for leaf consumption. Here we analyze the relationship between diet compositio[...]
Article
A. Hedenstrom, Auteur ;
M. Rosen, Auteur
Projected body frontal area is used when estimating the parasite drag of bird flight. We investigated the relationship between projected frontal area and body mass among passerine birds, and compared it with an equation based on waterfowl and ra[...]
Article
E. Johannesen, Auteur ;
D. Houston, Auteur ;
J. Russell, Auteur
The little penguin Eudyptula minor is unique among penguin species in being able to fledge chicks from two clutches in one breeding season. Pairs laying two clutches in a given season make a higher reproductive investment, and may be rewarded by[...]
Article
M. Desholm, Auteur
During a radar study of autumn migrating waterfowl Denmark, individual flight trajectories of bird flocks were seen to show zigzag-like patterns, rather than exact straight lines. An analysis of these small-scale changes in flight directions, wh[...]
Article
B. W. Tobalske, Auteur ;
T. L. Hedrick, Auteur ;
A. A. Biewener, Auteur
To test whether wing shape affects the kinematics of wing motion during bird flight, we recorded high-speed video (250 Hz) of four species flying in a variable-speed wind tunnel. The birds flew at intervals of 2 m s(-1), ranging from 1 m s(-1) u[...]
Article
K. Putz, Auteur ;
J. G. Smith, Auteur ;
R. J. Ingham, Auteur ;
B. H. Luthi, Auteur
The foraging patterns of ten male rockhopper penguins Eudyptes chrysocome from the Falkland Islands were recorded during the incubation period by using satellite telemetry. Irrespective of study site and year, two different foraging areas could [...]
Article
C. M. Rogers, Auteur
Article
P. Inchausti, Auteur ;
C. Guinet, Auteur ;
M. Koudil, Auteur ;
J. P. Durbec, Auteur ;
C. Barbraud, Auteur ;
H. Weimerskirch, Auteur ;
Y. Cherel, Auteur ;
P. Jouventin, Auteur
Global warming is expected to increase the frequency and intensity of inter-annual variation in Sea-Surface Temperatures (SST) associated with a latitudinal shift of frontal structures in the Southern Ocean. However, the long-term consequences o[...]
Article
S. M. Ramsay, Auteur ;
D. J. Mennill, Auteur ;
K. A. Otter, Auteur ;
L. M. Ratcliffe, Auteur ;
P. T. Boag, Auteur
Optimal sex allocation for individuals can be predicted from a number of different hypotheses. Fisherian models of sex allocation predict equal investment in males and females up to the end of parental care and predict brood compositions based o[...]
Article
D. P. Whitfield, Auteur
Over 11 winters I examined the interactions between sparrowhawk Accipiter nisus attack behaviour, the gregariousness of redshanks Tringa totanus and local geography to test hypotheses that suggest birds should flock to reduce their risk of preda[...]
Article
Nest site selection and predation driven despotic distribution of breeding long-eared owls Asio otus
D. Tome, Auteur
Long-eared owls Asio otus do not build their own nests. They occupy old corvid nests in either coniferous or deciduous trees. In my study area owls favoured coniferous over deciduous trees for nesting and occupied nest sites in that order. Compa[...]
Article
F. Sergio, Auteur
Many Holarctic bird species have been shown to be laying progressively earlier in response to global warming. Most studies have been conducted on small-bodied species at northern latitudes. In Italy, black kite Milvus migrans populations are con[...]
