Details

Autor(en) / Beteiligte

• Solheim, Roar
• Stjernberg, T
• Haila, Y (eds)

Titel

Breeding biology of the Pygmy Owl Glaucidium passerinum in two biogeographical zones in southeastern Norway

Ist Teil von

• Annales Zoologici Fennici [ANN. ZOOL. FENN.]. Vol. 21, no. 3. 1984, 1984-01, Vol.21 (3), p.295-300

Ort / Verlag

Finnish Academy of Sciences, Societas Scientiarum Fennica, Societas pro Fauna et Flora Fennica and Societas Biologica Fennica Vanamo

Erscheinungsjahr

1984

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Breeding data of Pygmy Owls were collected from southeastern Norway in 1971—1982. 29 breeding sites were located. The nests were grouped according to biogeographical zones. 11 of the nests were located in the boreal zone, and the remaining 18 in the boreonemoral zone. Clutch sizes varied from 3 to 10 eggs, and the onset of breeding lasted from the end of March to the middle of May. In the boreonemoral zone breeding took place both in years of high and low vole abundance, while in the boreal zone successful breedings were only recorded in years of high vole populations. In the boreal, but not in the boreonemoral zone, there was a negative correlation between clutch size and the onset of breeding. A possible explanation for this difference is presented.