Original scientific paper
Breeding characteristics of the barn swallow (Hirundo rustica) in NW Croatia
Z. Dolenec
Abstract
The research was carried out in the village of Mokrice (46°00'N, 15°55'E) in NW Croatia during 1998–1999. Egg length averaged 19.16 mm, egg breadth 13.72 mm, egg volume 1840.8 mm3, egg shape index 1.40 and egg weight 1.81 g (during both years). The nests were situated at a height of 1.5–4.5 m above ground (mean = 2.5 m). I found 2–7 eggs per nest, on average 4.56 eggs. A statistically significant positive correlation was found between mean egg volume and egg breadth, as well as length, egg length and egg shape index, egg length and egg breadth; whereas a statistically significant negative correlation was observed between egg breadth and egg shape index. The laying order did not affect egg dimensions (length, breadth, volume, shape index, all p>0.05). The %D-value is 2.31.
Keywords
barn swallow; Hirundo rustica; position of nest; egg characteristics; laying order; NW Croatia
Hrčak ID:
13446
URI
Publication date:
31.12.2002.
Visits: 2.846 *