Tomasz Janiszewski, Maciej Kamiński, Radosław Włodarczyk
Ornis Polonica 2012, 53: 274–282
https://doi.org/10.12657/ornis.2012.4.2
Abstract: The status of urban population of the Sparrowhawk Accipiter nisus in Poland is still poorly recognized. Therefore, research on breeding Sparrowhawk number, distribution and some aspects of breeding biology was conducted within the area of Łódź city (ca 294 km²) in 2010–2011. In 2010 a total of 34 breeding pairs (territories) were found (density 11.6 bp/100 km²), including 9 pairs (density 7.5 bp/100 km²) in central and transitional zones, and 25 pairs in the outskirts zone (14.4 bp/100 km²). These data indicate a strong increase of the population in all city zones since 1998–2002, when only 14 breeding pairs were recorded. During the study, a total of 63 Sparrowhawk nests were found. In central and transitional zones of Łódź Sparrowhawk nests were located more often on deciduous trees compared to the outskirts zone. Nests on deciduous trees were placed lower than these on coniferous tree species.
