| Titre : | Journal of Avian Biology 35(2) - MAR 2004 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
H. L. Mays, Auteur ;
K. J. McGraw, Auteur ;
G. Ritchison, Auteur ;
S. Cooper, Auteur ;
V. Rush, Auteur ;
R. S. Parker, Auteur
Sexual dimorphism or dichromatism has long been considered the result of sexual selection. However, for many organisms the degree to which sexual dichromatism occurs has been determined within the confines of human perception. For birds, objecti[...]
Article
P. Catry, Auteur ;
V. Encarnacao, Auteur ;
A. Araujo, Auteur ;
P. Fearon, Auteur ;
A. Fearon, Auteur ;
M. Armelin, Auteur ;
P. Delaloye, Auteur
Long-distance migrant passerines are well known to often display high levels of philopatry to breeding and wintering grounds. One could expect that similar selective pressures and similar navigation skills would result in their being faithful to[...]
Article
M. O. Cariello, Auteur ;
M. R. Lima, Auteur ;
H. G. Schwabi, Auteur ;
R. H. Macedo, Auteur
Egg characteristics have been used to determine egg maternity for birds in situations where two or more females lay eggs in a single nest (as in communal breeders and intraspecific parasites). We assessed the applicability of egg morphometry and[...]
Article
J. A. Green, Auteur ;
P. J. Butler, Auteur ;
A. J. Woakes, Auteur ;
I. L. Boyd, Auteur
The metabolic rate of moulting macaroni penguins Eudyptes chrysolophus was investigated using three techniques in order to test two hypotheses concerning the energetic cost of the moult fast in penguins. First, that energy expenditure during the[...]
Article
E. Shifferman, Auteur ;
D. Eilam, Auteur
The present study was aimed at testing a novel idea, that rather than maximizing their distance from a predator during close-distance encounters, prey species are better off moving directly or diagonally toward the predator in order to increase [...]
Article
P. Garcia-Borboroglu, Auteur ;
P. Yorio, Auteur
We examined microhabitat preferences and their adaptiveness for the kelp gull Larus dominicanus in one of its largest colonies in Patagonia. We quantified 13 habitat variables at 104 and 92 nest-sites and at 70 and
Article
T. Piersma, Auteur ;
J. A. Gessaman, Auteur ;
A. Dekinga, Auteur ;
G. H. Visser, Auteur
We measured basal metabolic rate (BMR), body mass, lean mass, and gizzard mass of captive red knots Calidris canutus islandica maintained on a trout chow diet (soft-texture, low ash and water content) for several years and then shifted to small [...]
Article
S. V. Drovetski, Auteur ;
R. M. Zink, Auteur ;
I. V. Fadeev, Auteur ;
E. V. Nesterov, Auteur ;
E. A. Koblik, Auteur ;
Y. A. Red'kin, Auteur ;
S. Rohwer, Auteur
We used maximum likelihood analysis of complete mitochondrial ND2 sequences (1041 bp) to clarify the taxonomy and relationships of various species and genera of grass and bush warblers. The tree revealed two clades of grass and bush warblers. On[...]
Article
D. Durant, Auteur ;
H. Fritz, Auteur ;
Patrick Duncan, Auteur
Recent findings suggest that herbivores select feeding sites of intermediate biomass in order to maximise their digestible nutrient intake as the result of the trade-off between forage quality and quantity ('forage maturation hypothesis'). We pr[...]
Article
Article
J. J. Price, Auteur ;
K. P. Johnson, Auteur ;
D. H. Clayton, Auteur
The abilities of some cave-nesting swiftlets to echolocate has traditionally been used to separate the genus Aerodramus, which includes echolocating species, from the genus Collocalia, thought to lack echolocation. Here we report the discovery o[...]
