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

Autori
Dolenec, Zdravko ; Delić, Antun ; Kralj, Jelena ; Dolenec, Petra

Izvornik
Polish Journal of Ecology (1505-2249) 55 (2007), 4; 841-845

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Tree Sparrow; Passer montanus; egg dimensions; repeatability; NW Croatia

Sažetak
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 breath – 14.1mm, egg volume – 1937.8 mm3 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.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA