| Titre : | Journal of Avian Biology 40(4) - JUL 2009 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Alex R. Gunderson, Auteur ;
Mark H. Forsyth, Auteur ;
John P. Swaddle, Auteur
Parasites influence the expression of secondary sexual traits and the health of infected individuals. We set out to test the influence of reputed exogenous parasites, plumage bacteria, including feather-degrading bacteria (FDB), on secondary sex[...]
Article
Leo Joseph, Auteur ;
Gregory J. Adcock, Auteur ;
Celeste Linde, Auteur ;
Kevin E. Omland, Auteur ;
Robert Heinsohn, Auteur ;
R. Terry Chesser, Auteur ;
David Roshier, Auteur
Two Australian species of teal (Anseriformes: Anatidae: Anas), the grey teal Anas gracilis and the chestnut teal A. castanea, are remarkable for the zero or near-zero divergence recorded between them in earlier surveys of mitochondrial DNA (mtDN[...]
Article
Jennifer L. Newbrey, Auteur ;
Wendy L. Reed, Auteur
Condition-dependent resource allocation to eggs can affect offspring growth and survival, with potentially different effects on male and female offspring, particularly in sexually dimorphic species. We investigated the influence of maternal body[...]
Article
Hannu Poysa, Auteur ;
Kari Lindblom, Auteur ;
Jarkko Rutila, Auteur ;
Jorma Sorjonen, Auteur
Eadie (1989) developed a method based on variation between females in egg length, width and weight to detect conspecific brood parasitism in the field: using these three egg measures, Euclidean distance between all pairs of eggs within a clutch [...]
Article
Penn Lloyd, Auteur ;
W. Andrew Taylor, Auteur ;
Morne A. du Plessis, Auteur ;
Thomas E. Martin, Auteur
In many cooperatively-breeding species, the presence of one or more helpers improves the reproductive performance of the breeding pair receiving help. Helper contributions can take many different forms, including allo-feeding, offspring provisio[...]
Article
Hans Schekkerman, Auteur ;
Arjan Boele, Auteur
Self-feeding precocial development is associated with high energy requirements and potentially vulnerable to short-term reductions in food availability, yet few studies have investigated development of foraging in precocial chicks and its sensit[...]
Article
Elena C. Berg, Auteur ;
John E. McCormack, Auteur ;
Thomas B. Smith, Auteur
The adaptive significance of avian egg speckling patterns has been a subject of ongoing debate. We examined speckling in a population of Mexican jays Aphelocoma ultramarina exhibiting extreme eggshell variability. We sampled 167 eggs at 55 nests[...]
Article
Yan Ropert-Coudert, Auteur ;
Francis Daunt, Auteur ;
Akiko Kato, Auteur ;
Peter G. Ryan, Auteur ;
Sue Lewis, Auteur ;
Kaori Kobayashi, Auteur ;
Yoshihisa Mori, Auteur ;
David Grémillet, Auteur ;
Sarah Wanless, Auteur
Plunge-diving is a specialised hunting tactic used by some avian predators to overcome the high buoyancy encountered near the water surface and surprise prey. However, plunge-diving is effective only to a certain depth; to access deeper prey, bi[...]
Article
Ellen Kalmbach, Auteur ;
Richard Griffiths, Auteur ;
Robert W. Furness, Auteur
In many sexually size-dimorphic species of birds and mammals, the larger sex, often the males, show increased environmental sensitivity during ontogeny. This is generally assumed to be due to higher energy requirements, reflected in higher absol[...]
Article
Gwylim S. Blackburn, Auteur ;
J. Mark Hipfner, Auteur ;
Ronald C. Ydenberg, Auteur
Predation, foraging and mating costs are critical factors shaping life histories. Among colonial seabirds, colony overflights may enhance foraging or mating success, or diminish the risk of predation and kleptoparasitism. The latter possibility [...]
Article
Chris Wiley, Auteur ;
Anna Qvarnstrom, Auteur ;
Lars Gustafsson, Auteur
Because they are ubiquitous and typically reduce the fitness of hosts, parasites may play important roles in hybrid zone dynamics. Despite much work on herbivores and hybrid plants, the effect of parasites on the fitness of animal hybrids is poo[...]
Article
Jorg Welcker, Auteur ;
Ann M. A. Harding, Auteur ;
Nina J. Karnovsky, Auteur ;
Harald Steen, Auteur ;
Hallvard Strom, Auteur ;
Geir W. Gabrielsen, Auteur
A bimodal foraging strategy has previously been described for procellariiform seabird species and is thought to have evolved in response to local resource availability being too low for adult birds to meet chick requirements and simultaneously m[...]
Article
Edward H. Burtt, Auteur
Article
Iván De la Hera, Auteur ;
Jose A. Diaz, Auteur ;
Javier Pérez-Tris, Auteur ;
José Luis Tellería, Auteur
Birds moult to maintain plumage function through life, but the factors that determine moult duration are poorly understood. In temperate areas, variation in moult duration could be largely associated with between-species differences in migratory[...]
Article
Anders Hedenström, Auteur ;
Timmy Fagerlund, Auteur ;
Mikael Rosen, Auteur ;
Ronnie Wirestam, Auteur
The amount of fat of a bird is a fundamental metric commonly used by avian biologists in studies of migration, winter energy management and condition. The methods used for estimating fat content range from simply measuring body mass and subtract[...]
