| Titre : | Ardea 95(1) - SPR 2007 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Article
Pedro M. Lourenço, Auteur
Ragworms Hediste diversicolor are an important prey item in the diet of many estuary birds. The standard method for estimating the number of Ragworms in faeces or pellets is simply dividing the counted number of Ragworm mandibles by two, which c[...]
Article
Christoph Randler, Auteur
Mating patterns in hybrid zones may be important for maintaining a stable hybrid zone. Theory suggests that hybrid zones are stable due to assortative mating outside the zone. To test whether assortative mating occurs in the crow hybrid zone in [...]
Article
Jenna E. Bowen, Auteur ;
Scott A. Petrie, Auteur
Although lead poisoning is common in swans, no information exists on the prevalence of lead artifact ingestion in swans using the lower Great lakes (LGL). We examined artifact ingestion (lead and non-toxic) in Mute Swans Cygnus olor and Tundra S[...]
Article
Rocio Mariano-Jelicich, Auteur ;
Enrique Madrid, Auteur ;
Marco Faverol, Auteur
Sexual segregation during foraging is common in birds and may occur at different temporal and spatial scales. In this study we explored the degree of sexual segregation in the Black Skimmer Rynchops niger by studying the species and sizes of pre[...]
Article
Keith J. Bensusan, Auteur ;
Ernest F. J. Garcia, Auteur ;
John E. Cortes, Auteur
Raptor migration has been monitored regularly at Gibraltar since the mid-1960s. Long-term trends in abundance of spring migration were investigated for the ten most frequent species, five of which changed significantly in abundance during the st[...]
Article
Bernard Spaans, Auteur ;
Kees van't Hoff, Auteur ;
Willem van der Veer, Auteur ;
Barwolt S. Ebbinge, Auteur
The probability of successful breeding by Brent geese in the Arctic appears to be positively correlated with the mass of females when they depart from spring staging areas in North-western Europe. To clarify the mechanism behind this relationshi[...]
Article
Julia Bojarinova, Auteur ;
Mikhail Markovets, Auteur
Late-hatched Great Tits Parus major have often a lower local recruitment rate than those hatched early However, estimates of recruitment usually neglect differential disappearance due to dispersal. We report on the proportions of late-hatched br[...]
Article
Sara Cabezas-Diaz, Auteur ;
Emilio Virgos, Auteur
Hatching success has been considered one of the main factors associated with fitness in birds. Hatching failure could be the result of two independent events, infertility and death of embryos, which have not been independently considered in most[...]
Article
Hans Schekkerman, Auteur ;
Albert J. Beintema, Auteur
Effects of agricultural intensification on availability of grassland invertebrates as food for chicks of the declining Black-tailed Godwit Limosu limosa were studied in The Netherlands. Invertebrates were sampled with photo-eclectors in wet gras[...]
Article
J. W. Duckworth, Auteur
Standard reviews list Arctic Warbler Phylloscopus borealis as a probable breeder in northern Korea, as well as passage migrant; the most recent states that spring passage begins c. 10 April and finishes within May. Near-daily structured counts i[...]
Article
Wlodzimierz Meissner, Auteur
For Red Knots Calidris c. canutus sandy coasts of the southern Baltic seem to be a low quality stopover site, because of unpredictable feeding conditions and a low density of molluscs. Observation collected in the Puck Bay, Poland, suggest that [...]
Article
Carles Barriocanal, Auteur ;
David Robson, Auteur
Spring migration of Willow Warbler Phylloscopus trochilus over the western Mediterranean was studied using observations collected at a ringing station on the mainland of Spain (Aiguamolls de l'Emporda), and at an island station (Cabrera, one of [...]
Article
Maarten Flikweert, Auteur ;
Tineke G. Prins, Auteur ;
John A. de Freitas, Auteur ;
Vincent Nijman, Auteur
On Bonaire we assessed Barn Owl Tyto alba diets at four discrete sites. The 233 fresh pellets contained 755 identifiable prey items from four taxonomic orders. Average prey diversity differed two- to threefold between sites. Dietary composition [...]
Article
Arkadiusz Sikora, Auteur ;
Anna Dubiec, Auteur
Jack Snipe Lymnocryptes minimus is a small wader showing sexual monomorphism in plumage and some dimorphism in size. To study whether parameters of body size may be used to reliably sex individuals of this species, a discriminant function analys[...]
Article
Marcin Polak, Auteur
This study analyses the effects of nest-site selection on predation risk of Great Bittern Botaurus stellaris nests. The study was conducted in fishponds of eastern Poland during four breeding seasons (2003-06). The habitat characteristics of 84 [...]
Article
Habitat use, home ranges and census techniques in the Black Woodpecker Dryocopus martius in the Alps
Massimo Bocca, Auteur ;
Loredana Carisio, Auteur ;
Antonio Rolando, Auteur
We focused upon habitat use and home range size variation in an alpine population of the Black Woodpecker Dryocopus martius. Habitat selection analyses showed that the dominant local forest type, i.e. Mountain Pine Pinus mugo uncinata, was signi[...]
