| Titre : | Journal of Avian Biology 38(4) - JUL 2007 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Peter G. Ryan, Auteur
Diving birds have to overcome buoyancy, especially when diving in shallow water. Darters and anhingas (Anhingidae) are specialist shallow-water divers, with adaptations for reducing their buoyancy. Compared to closely-related cormorants (Phalacr[...]
Article
Jerry W. Hupp, Auteur ;
Joel A. Schmutz, Auteur ;
Craig R. Ely, Auteur ;
Evgeny E. Syroechkovskiy, Auteur ;
Alexander V. Kondratyev, Auteur ;
William D. Eldridge, Auteur ;
Elena Lappo, Auteur
We studied reproductive success and post-breeding movements of 32 adult female emperor geese Chen canagica that were marked with satellite radio transmitters on their nesting area on the Yukon-Kuskokwim Delta (YKD), Alaska 2000-2004. All 16 fema[...]
Article
Jasper A. Vrugt, Auteur ;
Jelmer van Belle, Auteur ;
Willem Bouten, Auteur
Optimality models are frequently used in studies of long distance bird migration to help understand and predict migration routes, stopover strategies and fuelling behaviour in a spatially varying environment. These models typically evaluate bird[...]
Article
R. I. Guy Morrison, Auteur ;
Nick C. Davidson, Auteur ;
Jim R. Wilson, Auteur
Severe summer weather in Greenland and Arctic Canada in 1972 and 1974 caused very poor breeding success and elevated adult mortality in red knots Calidris canutus islandica. We show that those individual knots that are known to have survived the[...]
Article
Mutsuyuki Ueta, Auteur
The frequency of azure-winged magpies Cyanopica cyana that nest in association with breeding Japanese lesser sparrowhawks Accipiter gularis was compared between the 1990s and 2000s. During 1990-1994 azure-winged magpies nested within 50 m of the[...]
Article
Péter L. Pap, Auteur ;
Zoltán Barta, Auteur ;
Jacint Tokolyi, Auteur ;
Csongor I. Vágási, Auteur
Here we investigate the change in feather quality during partial post-juvenile and complete post-breeding moult in great tit Parus major by measuring the change in the number of fault bars and feather holes on wing and tail feathers. Feathers gr[...]
Article
Ian L. Jones, Auteur ;
Fiona M. Hunter, Auteur ;
Gregory J. Robertson, Auteur ;
Jeffrey C. Williams, Auteur ;
G. Vernon Byrd, Auteur
Annual survival rate and other demographic parameters of whiskered auklets Aethia pygmaea, a small planktivorous seabird, were measured at Buldir Island Alaska during 1992-2003 to provide comparative information for auk life history studies and [...]
Article
The predator avoidance hypothesis suggests that the failure of subordinate birds to provision nestlings in communally breeding species is a consequence of increased predation risk. Parents exclude subordinates from the nest area and thus reduce [...]
Article
Megan Dickens, Auteur ;
Ian R. Hartley, Auteur
In altricial birds, nestlings usually respond to the sound and appearance of the provisioning adults by begging for food when the adults arrive at the nest. Nestlings can, however, also beg incorrectly on hearing misleading sounds in the environ[...]
Article
Michal Skierczynski, Auteur ;
Kamila M. Czarnecka, Auteur ;
Tomasz S. Osiejuk, Auteur
Neighbour-stranger discrimination has been demonstrated in many species, but the mechanisms employed in discrimination vary. We tested whether an oscine bird with small repertoire size, the ortolan bunting Emberiza hortulana, discriminated betwe[...]
Article
Simon Y. W. Ho, Auteur
Many evolutionary studies of birds rely on the estimation of molecular divergence times and substitution rates. In order to perform such analyses, it is necessary to incorporate some form of calibration information: a known substitution rate, ra[...]
Article
Robert L. Nudds, Auteur
A comparative analysis using both independent contrasts (CAIC) and a species level analysis was used to investigate the allometric scaling of avian wing-bone lengths. Total arm (ta=humerus+ulna+manus) scaled with positive allometry as body mass [...]
Article
William P. Brown, Auteur ;
Paul Eggermont, Auteur ;
Vincent LaRiccia, Auteur ;
Roland R. Roth, Auteur
For many bird species, growth is negative or equivocal during development. Traditional, parametric growth curves assume growth follows a sigmoidal form with prescribed inflection points and is positive until asymptotic size. Accordingly, these c[...]
