| Titre : | Journal of Ornithology 149(4) - OCT 2008 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Scott Wilson, Auteur ;
Kathy Martin, Auteur
We examined breeding habitat selection at two scales for White-tailed (Lagopus leucura), Rock (L. muta), and Willow Ptarmigan (L. lagopus) at an alpine site in the Ruby Range Mountains of the Yukon Territory, Canada. To infer species-specific pr[...]
Article
M. Andreina Pacheco, Auteur ;
Miguel Lentino, Auteur ;
Carolina Mata, Auteur ;
Silvio Barreto, Auteur ;
Maria Araque, Auteur
We isolated aerobic and anaerobic facultative bacteria inhabiting the crop of adult Dusky-billed Parrotlets (Forpus modestus). We looked for bacteria capable of hydrolyzing starch, the most abundant polysaccharide in seeds. We compared our resul[...]
Article
Roswitha Wiltschko, Auteur ;
Ursula Munro, Auteur ;
Hugh Ford, Auteur ;
Wolfgang Wiltschko, Auteur
Experiments with migrating birds on the interaction between magnetic and celestial cues have produced heterogeneous results. A recent study claimed that the magnetic compass in passerine migrants is calibrated by the pattern of polarized light a[...]
Article
Roswitha Wiltschko, Auteur ;
Ursula Munro, Auteur ;
Hugh Ford, Auteur ;
Wolfgang Wiltschko, Auteur
Article
Tobias Ludwig, Auteur ;
Ilse Storch, Auteur ;
Jann Wuebbenhorst, Auteur
In the Central European lowlands, the Black Grouse (Tetrao tetrix) is restricted to isolated remnant populations. Status reports have been published for some of them, but comparative analyses of Black Grouse dynamics across larger parts of the C[...]
Article
Rachel Muheim, Auteur ;
Susanne Åkesson, Auteur ;
John B. Phillips, Auteur
Article
Fraenzi Korner-Nievergelt, Auteur ;
Pius Korner-Nievergelt, Auteur ;
Edi Baader, Auteur ;
Luzius Fischer, Auteur ;
Werner Schaffner, Auteur ;
Matthias Kestenholz, Auteur
We analysed the number of autumn migrants at a bird ringing station over
Article
Jan van der Winden, Auteur ;
Peter W. van Horssen, Auteur
Based on empiric data of breeding success and accurate number trends in The Netherlands, a population model for the black tern was constructed. This model is based on Leslie matrices. Reproductive parameters from the four most important landscap[...]
Article
Oddmund Kleven, Auteur ;
Bjorn-Aksel Bjerke, Auteur ;
Jan T. Lifjeld, Auteur
Extrapair paternity seems to be common in socially monogamous passerines, but the genetic mating system of most species is currently unknown. Here, we report the first study of paternity in the socially monogamous Common Crossbill (Loxia curviro[...]
Article
Verena Dietrich-Bischoff, Auteur ;
Tim Schmoll, Auteur ;
Wolfgang Winkel, Auteur ;
Thomas Lubjuhn, Auteur
The magnitude of sexual size dimorphism can be affected by sex differences in environmental sensitivity early in ontogeny that result in differential growth rates of male and female nestlings. Here, the larger sex might either be more sensitive [...]
Article
J. Dylan Maddox, Auteur ;
Rachel M. Bowden, Auteur ;
Patrick J. Weatherhead, Auteur
Maternal effects are typically thought to enhance rather than reduce offspring performance, but asynchronous hatching (ASH) in birds typically produces a size hierarchy within a clutch that frequently reduces the growth and survival of nestlings[...]
Article
Matthew Low, Auteur ;
Sonke Eggers, Auteur ;
Debora Arlt, Auteur ;
Tomas Part, Auteur
The diurnal pattern of foraging behaviour in birds is commonly linked to the risk of starvation and predation. During the breeding season, when offspring place additional demands on the quantity of food adults need to collect, diurnal foraging p[...]
Article
Robert A. M. Ashdown, Auteur ;
Andrew E. McKechnie, Auteur
We examined environmental correlates of activity in the Freckled Nightjar (Caprimulgus tristigma), a nocturnal aerial insectivore that is resident year-round in the colder and drier parts of southern Africa. Specifically, we tested the predictio[...]
Article
Carmen Martinez, Auteur
This paper describes at a regional scale the distribution pattern, density, productivity and sex ratio of great bustards in northwestern Spain and explores the role played by habitat type, terrain characteristics and human disturbance on variati[...]
Article
Stephanie Geiser, Auteur ;
Raphaël Arlettaz, Auteur ;
Michael Schaub, Auteur
While habitat destruction is thought to be the most important reason for the decline of the Wryneck Jynx torquilla throughout Europe, it has been hypothesised that weather factors may also play a crucial role. We studied the impact of variations[...]
Article
Javier Gonzalez, Auteur ;
Michael Wink, Auteur ;
Eduardo Garcia-Del-Rey, Auteur ;
Guillermo Delgado Castro, Auteur
We obtained DNA sequence data from mitochondrial (cytochrome b) and nuclear genes (myoglobin and ornithine decarboxylase) to reconstruct the phylogenetic relationships among eight species of shrikes (Lanius). Phylogenetic analyses based on maxim[...]
Article
Michael A. MacDonald, Auteur ;
Mark Bolton, Auteur
There is concern that predation of Lapwing Vanellus vanellus nests may create additional pressure on declining populations of this species in Europe. At seven sites in England and Wales, daily nest predation rates on 1,390 nests were related to [...]
Article
Nathaline Erne, Auteur ;
Valentin Amrhein, Auteur
Males of many songbird species have peaks of singing activity at dawn and dusk. Singing during those twilight periods can function in territory proclamation, and males are suggested to adjust song output to the level of intruder pressure. We use[...]
Article
Edward H. Miller, Auteur ;
Sampath S. Seneviratne, Auteur ;
Ian L. Jones, Auteur ;
Gregory J. Robertson, Auteur ;
Sabina I. Wilhelm, Auteur
Species and sexual differences in vocalizations and the vocal tract are widespread. We studied the vocal tract of Common (Uria aalge) and Thick-billed (U. lomvia) Murres. We predicted anatomical or allometric differences in adults between specie[...]
Article
Jens von dem Bussche, Auteur ;
Reto Spaar, Auteur ;
Hans Schmid, Auteur ;
Boris Schroeder, Auteur
We present here a multiscale modelling approach to predict the current and future spatial distribution of Ring Ouzel (Turdus torquatus) and Blackbird (T. merula) in Switzerland. Species distribution models (SDMs) are applied on three different s[...]
Article
René E. van Dijk, Auteur ;
Jan Komdeur, Auteur ;
Marco Van Der Velde, Auteur ;
Istvan Szentirmai, Auteur ;
Xutong Yang, Auteur ;
Richard Ffrench-Constant, Auteur ;
Tamás Székely, Auteur
Despite the growing literature on facultative sex-ratio adjustment in chromosomal sex-determining vertebrate taxa (birds, mammals), the consistency of results is often low between studies and species. Here, we investigate the primary and seconda[...]
Article
Sonja C. Ludwig, Auteur ;
Peter H. Becker, Auteur
Divorce between seasons is a common phenomenon in seabirds, whereas within-season mate change is rarely observed. We report four cases of within-season mate change in renesting Common Terns Sterna hirundo during a year of heavy predation by a Lo[...]
Article
Alexandra Sapoznikow, Auteur ;
Flavio Quintana, Auteur
The rock shag (Phalacrocorax magellanicus) is an endemic species from southern Argentina and Chile. In Argentina, the population is distributed along the Patagonian coast in 143 small colonies (5-377 pairs). We studied colony and nest site fidel[...]
