Gustoća gnijezda, veličina pologa i dimenzije jaja sive vrane (Corvus corone cornix)

Authors and affiliation

• Zdravko Dolenec Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10 000 Zagreb, Croatia

Abstract

In 2005 the variation of clutch size of tree sparrows Passer montanus was investigated in the Mokrice rural area, north-western Croatia. Average clutch size of first clutches was 5.00 eggs (SD = 0.62), of the second 5.36 eggs (SD = 0.66) and of the third 4.86 eggs (SD = 0.71). Repeatability (r) of clutch size in first, second and third clutches (within-year) was significant (p = 0.005). This means that 33% of the variation in clutch size is due to intraindividual variation of genetic factors (intrinsic »female quality«).

Keywords

Tree Sparrow, Passer montanus, clutch size, repeatability, north-western Croatia

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