Breeding Characteristics of the Barn Swallow (hirundo Rustica) in Nw Croatia
نویسنده
چکیده
Dolenec, Z.: Breeding characteristics of the barn swallow (Hirundo rustica) in NW Croatia. Nat. Croat., Vol. 11, No. 4., 439–445, 2002, Zagreb. 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.
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