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2 Polish Journal of Ecology

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Female biometrical characteristics and egg dimensions of the Starling (Sturnus vulgaris L.) in Croatia

Dolenec Z., Kralj J., Mustafić P., Dolenec P.

Polish Journal of Ecology

2008

Vol. 56, nr 3

545-548

Female biometrical characteristics play an important role in the breeding and contribute to breeding success. The size and shape of Starling (Sturnus vulgaris) eggs in relation to female characteristics were examined. The material was collected in northwestern Croatia (Mokrice region) in 2007. Only first clutches were analysed. Egg length averaged 29.7 mm, egg breadth - 21.2 mm, egg volume - 6810 mm[^3] and egg shape index - 1.41. The inter-clutch CV amounted 6% for length, 3% for breadth, 10% for volume and 6% for egg shape index. The mean female body mass was equal to 81.8 g, wing length - 128.6 mm and female condition - 0.64. No significant correlation was found between the female biometrical parameters like body mass, wing length, female condition and egg dimensions (like egg length, egg breadth, egg volume) or egg shape. Egg length was marginally correlated with egg breadth. Female body mass was significantly correlated with wing length.

Variation in egg dimension of the Tree Sparrow (Passer montanus L.) in north-western Croatia

Dolenec Z.

Polish Journal of Ecology

2007

Vol. 55, nr 4

841-845

A nest-box-breeding population of Tree Sparrow was studied during 2004-2005 in the rural area (in locality Mokrice) in northwestern Croatia. The mean egg length was 18.9 mm, egg breadth - 14.1 mm, egg volume - 1937.8 mm[^3] and egg shape index - 1.34. No significant correlation between egg volume and clutch size was found (P> 0.05) and there is no significant difference in those parameters between years of study (2004 and 2005) as well as between successive clutches in the given year. The repeatability of egg dimensions (r = 0-1) of females that bred in an area three times a year was estimated. The egg dimensions are highly repeatable r = 0.78, 0.63, 0.72 and 0.75 for length, breadth, volume and shape index, respectively. The results suggest that in Tree Sparrow population one should expect relatively high heritability of egg dimensions.