| Titre : | Journal of Ornithology 150(2) - APR 2009 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Tsewang Namgail, Auteur ;
Yoram Yom-Tov, Auteur
We studied the effects of body mass, status (resident or migratory) and diet on the breeding elevation range and timing of reproduction of the birds in the Trans-Himalayan region of Ladakh, northwestern India. Most of breeding birds of Ladakh ar[...]
Article
Muhammad Arshad, Auteur ;
Muhammad J. I. Chaudhary, Auteur ;
Michael Wink, Auteur
Populations of Oriental White-backed Vulture (Gyps bengalensis) and Long-billed Vulture (Gyps indicus) declined dramatically by 95-100% on the Indian subcontinent in during the mid-1990s. The study reported here was conducted in Pakistan to comp[...]
Article
Elizabeth Yohannes, Auteur ;
Herbert Biebach, Auteur ;
Gerhard Nikolaus, Auteur ;
David J. Pearson, Auteur
Using the body mass estimates of 12 long-distance migrating Palearctic passerine species monitored at successive sites across the Eastern Africa flyway, we tested whether birds modulate their body mass according to specific seasonal demands acro[...]
Article
Stevan Kragten, Auteur ;
Erwin Reinstra, Auteur ;
Erik Gertenaar, Auteur
Populations of farmland birds are under pressure as a result of agricultural intensification. It has been proposed that less intensive approaches to farming, such as organic farming methods, may halt these population declines. In addition, organ[...]
Article
Thor H. Ringsby, Auteur ;
Torborg Berge, Auteur ;
Bernt-Erik Saether, Auteur ;
Henrik Jensen, Auteur
Parental care is assumed to be closely associated with individual differences in reproductive success. We investigated how feeding frequencies varied among parents and how this affected the subsequent reproductive success in insular populations [...]
Article
Javier Gonzalez, Auteur ;
Guillermo Delgado Castro, Auteur ;
Eduardo Garcia-Del-Rey, Auteur ;
Carola Berger, Auteur ;
Michael Wink, Auteur
DNA nucleotide sequences from two mitochondrial genes (cytochrome b and NADH dehydrogenase subunit 2) and the nuclear intron 7 of beta-fibrinogen were obtained to infer the phylogenetic origin of the two endemic Canarian pigeons: Bolle's Pigeon [...]
Article
Fernando R. Barri, Auteur ;
Monica B. Martella, Auteur ;
Joaquin L. Navarro, Auteur
Selection of nest-site habitat by a population of wild Lesser Rheas (Rhea pennata pennata) was studied in the northwestern Patagonia steppe, Argentina, during two reproductive seasons (2004/2005 and 2005/2006). Nest spatial distribution was comp[...]
Article
A. J. Kroll, Auteur ;
Jonathan B. Haufler, Auteur
Examination of spatial and temporal factors that influence nest survival can provide insight into habitat selection, reproductive decisions (e.g., clutch size), population dynamics, and conservation requirements for species. We used nest surviva[...]
Article
Paulina L. Gonzalez-Gomez, Auteur ;
Cristián F. Estades, Auteur
In many hummingbird species there is an opposite pattern of sexual dimorphism in bill length and other morphometric measures of body size. These differences seem to be closely related with differences in foraging ecology directly associated with[...]
Article
Irene Keller, Auteur ;
Fraenzi Korner-Nievergelt, Auteur ;
Lukas Jenni, Auteur
Waterbirds are often observed to move between different wintering sites within the same winter-for example, in response to food availability or weather conditions. Within-winter movements may contribute to the spreading of diseases, such as avia[...]
Article
Thomas S. Reichlin, Auteur ;
Michael Schaub, Auteur ;
Myles H. M. Menz, Auteur ;
Murielle Mermod, Auteur ;
Patricia Portner, Auteur ;
Raphaël Arlettaz, Auteur ;
Lukas Jenni, Auteur
For many bird species, recovery of ringed individuals remains the best source of information about their migrations. In this study, we analyzed the recoveries of ringed European Hoopoe (Upupa epops) and the Eurasian Wryneck (Jynx torquilla) from[...]
Article
Victor N. Bulyuk, Auteur ;
Andrey Mukhin, Auteur ;
Dmitry Kishkinev, Auteur ;
Vladislav Kosarev, Auteur
We studied the effects of weather and the lunar cycle on long-distance nocturnal pre-migratory flights of Reed Warblers (Acrocephalus scirpaceus). Noturnal tape luring was used to capture the birds, and the study was carried out in a habitat aty[...]
Article
Guillermo E. Perez, Auteur ;
Keith A. Hobson, Auteur
Several species of migrant birds overlap in range on their wintering grounds with non-migrant conspecifics or other species that occupy a similar niche. Very little is known whether such overlap results in competition and subsequent habitat segr[...]
Article
K. C. Burns, Auteur
Competition for cache retrieval is hypothesised to influence food hoarding intensity. Previous work has tested this hypothesis by evaluating food hoarding rates during foraging bouts when animals are exposed to different levels of competition fo[...]
Article
Hany Alonso, Auteur ;
Rafael Matias, Auteur ;
Jose Pedro Granadeiro, Auteur ;
Paulo Catry, Auteur
The replacement of old feathers is essential for birds, but it is also an energy-demanding task. As moult usually does not coincide with other stressful events in its annual cycle, such as reproduction and migration, the bird can optimise its us[...]
Article
Dieter Thomas Tietze, Auteur ;
Jochen Martens, Auteur
Lengths of hind claw, tarsus, bill, wing and tail plus bill depth and width, wing tip and tail graduation were measured in nearly 2,000 specimens from all nine currently accepted Certhia species and most subspecies to provide morphometric charac[...]
Article
Yoko Muraoka, Auteur ;
Christian H. Schulze, Auteur ;
Mihaela Pavlicev, Auteur ;
Gábor Wichmann, Auteur
Due to being a virtually monomorphic wader species, migration dynamics and sex-related migration patterns in the Wood Sandpiper (Tringa glareola) have rarely been investigated. We captured spring migrants at an important stopover site in northea[...]
Article
Muhammad Arshad, Auteur ;
Javier Gonzalez, Auteur ;
Abdel Aziz El-Sayed, Auteur ;
Tim Osborne, Auteur ;
Michael Wink, Auteur
Populations of Oriental White-backed Vulture (Gyps bengalensis) and Long-billed Vulture (Gyps indicus) dramatically declined by 95-100% on the Indian subcontinent in mid-1990s. The present study was conducted to discover the phylogeny and phylog[...]
Article
Alexander Braasch, Auteur ;
Carmen Schauroth, Auteur ;
Peter H. Becker, Auteur
Once a bird has fledged it becomes hardly accessible for researchers and consequently knowledge about post-fledging ontogeny is scarce. In this study on juvenile Common Terns (Sterna hirundo) we used an automated transponder-based detection and [...]
Article
Rebekah Christensen, Auteur ;
Sonia Kleindorfer, Auteur
Theory predicts that species should have wider foraging niches during conditions of resource scarcity. However, empirical evidence to date has shown mixed patterns, including studies of Darwin's finches that have found narrower foraging niches d[...]
