Titre : | Ibis : The International Journal of Avian Science 149(1) - JAN 2007 |
Type de document : | Bulletin |
Paru le : | 00/00/0000 |
Dépouillements
Article
Graham R. Martin, Auteur ;
Nigel Jarrett, Auteur ;
Murray Williams, Auteur
Blue Ducks Hymenolaimus malacorhynchos (Anatidae), an IUCN Red Listed Endangered species, reside in headwaters of New Zealand rivers and feed primarily on aquatic invertebrates. However, whether such food items are detected by tactile or visual [...]
Article
Elizabeth M. Humphreys, Auteur ;
Sarah Wanless, Auteur ;
David M. Bryant, Auteur
Measurements of the energy costs of individual behaviours provide insights into how animals trade-off resource allocation and energy acquisition decisions. The energetic costs while resting on water are poorly known for seabirds but could compri[...]
Article
Kasi B. Desfor, Auteur ;
Jacobus J. Boomsma, Auteur ;
Peter Sunde, Auteur
Tawny Owls Strix aluco have been reported to skew the sex ratio of their offspring towards males when facing food shortage during the nestling period (and vice versa), because female fitness is more compromised by food shortage during developmen[...]
Article
R. H. Mccleery, Auteur ;
C. M. Perrins, Auteur ;
D. Wheeler, Auteur ;
S. Groves, Auteur
It is well known that in breeding Mute Swans Cygnus olor males initiate moult 4-6 weeks after their mate, and that in non-breeding flocks males and females moult at about the same time. Here we show that mated pairs that have lost their young mo[...]
Article
Ken Kraaijeveld, Auteur ;
Ma Ming, Auteur ;
Jan Komdeur, Auteur ;
Raoul A. Mulder, Auteur
In sexually dichromatic birds, females may adaptively adjust the sex ratio of their offspring prior to hatching in relation to male ornamentation, for example, by producing more sons when paired to a highly attractive partner. However, to our kn[...]
Article
Pierre Jouventin, Auteur ;
Anne Charmantier, Auteur ;
Marie-Pierre Dubois, Auteur ;
Philippe Jarne, Auteur ;
Joël Bried, Auteur
Although 92% of avian species are socially monogamous, extra-pair copulation (EPC), resulting in extra-pair paternity (EPP), is a common reproductive strategy in birds. Among seabirds, in which the rate of social monogamy reaches 100%, Procellar[...]
Article
Gillian Gilbert, Auteur ;
Glen A. Tyler, Auteur ;
Christopher J. Dunn, Auteur ;
Norman Ratcliffe, Auteur ;
Ken W. Smith, Auteur
Great Bitterns Botaurus stellaris have experienced a population decline in the UK, such that in 1997 the total number of breeding males was just 11. This study aimed to identify factors affecting productivity, and how management could be used to[...]
Article
Peter G. Ryan, Auteur ;
Richard A. Phillips, Auteur ;
Deon C. Nel, Auteur ;
Andrew G. Wood, Auteur
Although Grey-headed Albatrosses Thalassarche chrysostoma are usually regarded as biennial breeders, taking a year off following a successful breeding attempt, a small proportion of successful birds attempt to breed annually. This proportion was[...]
Article
Andrew McGowan, Auteur ;
Martin K. Fowlie, Auteur ;
Douglas J. Ross, Auteur ;
Ben J. Hatchwell, Auteur
Article
Marina Dmitrenok, Auteur ;
Luca Puglisi, Auteur ;
Laurent Demongin, Auteur ;
Gillian Gilbert, Auteur ;
Marcin Polak, Auteur ;
Vincent Bretagnolle, Auteur
Biometrics, plumage and bare-part colour of 87 Great Bitterns Botaurus stellaris from the UK, France, Italy, Poland and Belarus, of known sex (sexed by behaviour, DNA or dissection), were analysed to provide reliable sexing and ageing criteria f[...]
Article
Juan A. Amat, Auteur ;
José A. Masero, Auteur
We tested whether belly-soaking (i.e. wetting of ventral plumage) in incubating Kentish Plovers Charadrius alexandrinus in a hot environment serves to cool overheated eggs, or whether belly-soaking would mainly serve for adult thermoregulation, [...]
Article
Carmen Carrillo, Auteur ;
Andres Barbosa, Auteur ;
Francisco Valera, Auteur ;
Rafael Barrientos, Auteur ;
Eulalia Moreno, Auteur
Article
D. Philip Whitfield, Auteur ;
Alan H. Fielding, Auteur ;
Mike J. P. Gregory, Auteur ;
A. G. Gordon, Auteur ;
David R. A. McLeod, Auteur ;
Paul F. Haworth, Auteur
The development of commercial forests presents potential threats to large raptors that rely on prey caught in open country. We examined the effect of afforestation of breeding habitat used by a population of Golden Eagles Aquila chrysaetos in Sc[...]
Article
Markus S. Ritz, Auteur
Mass loss of chick-rearing birds can be the direct consequence of physiological stress (reproductive stress hypothesis) or an adaptive mass adjustment in response to the increased demands on flight efficiency during the flight-intensive chick-re[...]
Article
José Luis Tellería, Auteur ;
Javier Pérez-Tris, Auteur
If resource availability shapes population distribution, changes in resource abundance should cause parallel changes in population numbers. However, tracking ability may be disrupted by different environmental and behavioural factors that act at[...]
Article
James W. Pearce-Higgins, Auteur ;
Murray C. Grant, Auteur ;
Martin C. Robinson, Auteur ;
Susan L. Haysom, Auteur
Black Grouse Tetrao tetrix in Britain have declined through the 20th century, and most birds are now in Scotland. Many causes for this decline have been suggested, notably agricultural intensification, increased grazing levels and moorland affor[...]
Article
Viviana Massoni, Auteur ;
Florencia Bulit, Auteur ;
Juan Carlos Reboreda, Auteur
We conducted a study of the breeding biology of the White-rumped Swallow Tachycineta leucorrhoa nesting in nestboxes in a flat, farming landscape in Buenos Aires Province, Argentina. White-rumped Swallow nesting attempts were detected from the e[...]
Article
Peter A. Cotton, Auteur
Many ecological theories predict a close match between food resources and the number and diversity of consumers but comparatively few empirical studies have simultaneously quantified seasonal variation in an entire assemblage and its resource ba[...]
Article
Andre A. Dhondt, Auteur ;
Melanie J. L. Driscoll, Auteur ;
Elliott C. H. Swarthout, Auteur
We studied House Finch Carpodacus mexicanus roosting behaviour during the non-breeding season using radiotracking and direct observations in Ithaca, NY, USA. In contrast to what has been reported in the literature and in contrast to what should [...]
Article
Jose J. Cuervo, Auteur ;
Anders P. Moller, Auteur ;
Florentino De Lope, Auteur
Currently, there is no agreement about the suitability of haematocrit (the proportion of blood volume occupied by packed red blood cells) as a predictor of condition in birds. In order to clarify this point, genetic and environmental components [...]
Article
Anne Peters, Auteur
When selection strongly favours a testosterone-dependent trait in males, and this trait is not beneficial to females, a correlated response to selection in females, which also circulate some testosterone, could slow the rate of evolution in male[...]