| Titre : | Ornis Fennica 83(4) - 2006 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Marian Janiga, Auteur ;
Martina Novotna, Auteur
In flocks of Alpine Accentors (Prunella collaris), we observed the foraging behaviour of birds when they were foraging on a grid containing clumps of seeds. We measured the feeding rate, diet diversity, individual and seasonal feeding preference[...]
Article
Juan Arizaga, Auteur ;
Francisco Campos, Auteur ;
Daniel Alonso, Auteur
Long-distance migrants have a more pointed and concave wing than short-distance migrants. These pointed and concave wings are thought to minimize the energy-cost of flight. Detailed analyses of wing morphology among populations might therefore o[...]
Article
Jesper Nystrom, Auteur ;
Johan Ekenstedt, Auteur ;
Anders Angerbjorn, Auteur ;
Linda Thulin, Auteur ;
Peter Hellstrom, Auteur ;
Love Dalen, Auteur
We studied the diet and the relationship between prey density fluctuations and breeding success of a Golden Eagle (Aquila chrysaetos) population on the mountain tundra region of northern Sweden. We used a new PCR based method to analyse the DNA [...]
Article
Ondřej Sedláček, Auteur ;
Blanka Cikanova, Auteur ;
Roman Fuchs, Auteur
It has long been hypothesized that birds learn to recognize heterospecific competitors and for that reason males behave more aggressively against intruders in areas of local sympatry. Recently, it has been confirmed that individuals of one speci[...]
Article
Piotr Tryjanowski, Auteur ;
Tim H. Sparks, Auteur ;
Humphrey Q. P. Crick, Auteur
We compare the breeding ecology of Red-backed Shrike Lanius collurio prior to its effective extinction (in 1990) as a breeding bird in the UK with that of a stable population in southwestern Poland. We use breeding performance data derived from [...]
