| Titre : | Ornis Fennica 75(2) - 1998 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
K. Reinhardt, Auteur
This paper is the first methodological investigation of the ligature application for food studies in semi-precocial birds. In a population of Brown Skuas, South Polar Skuas and mixed pairs, ligatures were attached to chicks for a period of 28 ho[...]
Article
Article
E. Huhta, Auteur ;
H. Hakkarainen, Auteur ;
P. Lundvall, Auteur
Article
S. Rytkonen, Auteur ;
P. Kuokkanen, Auteur ;
M. Hukkanen, Auteur ;
K. Huhtala, Auteur
Prey selection of the Sparrowhawk (Accipiter nisus) was studied in northern Finland during 1982-1993. A total of 540 prey items tall birds) were recorded from the surroundings of 12 nests. For each prey species a vulnerability index was calculat[...]
Article
R. A. Vaisanen, Auteur
Heterogeneous coverage of data is a serious problem in atlas mappings, because it may bias the interpretation of maps and cause difficulties in statistical tests of distribution changes of species between successive atlas surveys. The areal cove[...]
