| Titre : | Ardea 100(1) - SPR 2012 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Johan de Jong, Auteur ;
Arnold van den Burg, Auteur
Nominate Barn Owls Tyto a. alba can be sexed based on flecking patterns of the underwing and underbody, but in the Dutch population consisting of the nominate subspecies and IT a. guttata, overlap in flecking exists between the sexes. In this pa[...]
Article
Niko M. Groen, Auteur ;
Rosemarie Kentie, Auteur ;
Petra de Goeij, Auteur ;
Bram Verheijen, Auteur ;
Jos C. E. W. Hooijmeijer, Auteur ;
Theunis Piersma, Auteur
For a long time, agricultural areas had considerable ornithological value, an ecological richness which in The Netherlands was epitomised by the term 'meadow birds'. However, over the last half century, agricultural intensification has negativel[...]
Article
Gunnar Thor Hallgrimsson, Auteur ;
Ron W. Summers, Auteur ;
Brian Etheridge, Auteur ;
Bob Swann, Auteur
Iceland has a large resident population of Purple Sandpipers Calidris maritima, but is also believed to be a wintering area for other populations and is a stopover site for migrants. To determine the wintering areas of those that prepare for wes[...]
Article
Peter G. Ryan, Auteur ;
Lloyd Edwards, Auteur ;
Lorien Pichegru, Auteur
We report co-operative group foraging in the African Penguin Spheniscus demersus. Groups of approximately 25-165 African Penguins were observed circling schools of pelagic fish, sometimes forcing them to the surface. During this behaviour 66-75%[...]
Article
Vicente Garcia-Navas, Auteur ;
Juan Jose Sanz, Auteur
Over a five-year period we monitored breeding parameters in a colony of Tree Sparrows Passer montanus in central Spain. This multi-brooded species can raise one to three broods per season. In this study, we analyzed inter-brood variation in repr[...]
Article
Sonia González-Braojos, Auteur ;
Ana I. Vela, Auteur ;
Rafael Ruiz-De-Castañeda, Auteur ;
Víctor Briones, Auteur ;
Juan Moreno, Auteur
Gut bacterial loads in avian nestlings may be affected by factors such as climate, seasonality and brood size. There is no published information on this subject for wild birds, despite its potential importance for nestling welfare and growth. We[...]
Article
Norbert Duda, Auteur ;
Wlodzimierz Chetnicki, Auteur
Given the many detailed studies on the breeding biology of gulls, surprisingly little is known about conspecific brood parasitism (CBP) in these birds. CBP has been recorded in only a few of the roughly 60 species of Laridae. We studied CBP in t[...]
Article
Abel Gyimesi, Auteur ;
Bart van Lith, Auteur ;
Bart A. Nolet, Auteur
Aquatically foraging Bewick's Swans Cygnus bewickii have been repeatedly reported to be accompanied by diving ducks, but the exact nature of this relationship is unclear. Based on field observations, we found a strong correlation between the num[...]
Article
Sjoerd Duijns, Auteur ;
Joop Jukema, Auteur ;
Bernard Spaans, Auteur ;
Peter van Horssen, Auteur ;
Theunis Piersma, Auteur
Two populations of Bar-tailed Godwits Limosa lapponica occur along the East-Atlantic Flyway. The European population (L. I. lapponica) is supposed to breed in northern Scandinavia and has been suggested to only winter in Europe. The Afro-Siberia[...]
Article
Peihao Cong, Auteur ;
Xin Wang, Auteur ;
Lei Cao, Auteur ;
Anthony D. Fox, Auteur
At the important wintering site, East Dongting Lake in the Yangtze River flood-plain, Lesser White-fronted Geese Anser erythropus showed within-season shifts in distribution and abundance between local areas. On arrival in November, over 4,000 g[...]
Article
Johanna Groenroos, Auteur ;
Martin Green, Auteur ;
Thomas Alerstam, Auteur
Flight directions and routes of migrating birds are determined by the birds' compass orientation, but also by effects of wind, social influence, responses to topography and landmarks, and to navigation cues. We investigated the orientation and r[...]
Article
Article
Gregorio Magno Toral, Auteur ;
Jordi Figuerola, Auteur
We monitored nests of Kentish Plover Charadrius alexandrinus and Black-winged Stilt Himantopus himantopus breeding in rice fields near the Donana National Park (southwest Spain) during the breeding seasons 2005-2007. We used a logistic-exposure [...]
