Bocian biały (Ciconia ciconia) na terenie byłego powiatu kutnowskiego w latach 1984 i 1985

Abstract

The White Stork (Ciconia ciconia) bred in the former district of Kutno in 1985 at a density of 5.33 pairs/100 km 2. The mean number of nestlings per nest occupied by a pair was 2.24 and the mean number of nestlings per nest with nestlings was 2.73. 93% of the nests were situated on trees (mainly poplar trees) and 92% were up to 100 m from buildings. Storks nesting in the eastern part of the former Kutno district show a regular distribution of nests, while those from the western part a contagious one. The mean number of nestlings was statistically significantly higher in the eastern part, which can be explained by better foraging conditions there due to many river valleys.