Adaptation of Eurasian Magpie (Pica pica) to Urban Environments: Population Dynamics and Habitat Preferences in Zielona Góra (Poland) over 23 Years

TL;DR

This study tracks how Eurasian magpies have adapted to urban life in Zielona Góra, Poland, over 23 years, showing their population growth and habitat preferences.

Contribution

The study provides a long-term analysis of magpie population dynamics and habitat shifts in a rapidly urbanizing area.

Findings

Magpie density was highest in urbanized zones like the old town and residential blocks.

Nests shifted from poplars to coniferous trees, particularly spruces.

Nest placement was influenced by proximity to trash bins, water sources, and tall trees.

Abstract

This study examines the population dynamics and habitat preferences of the Eurasian magpie Pica pica in Zielona Góra over 23 years, highlighting the impact of urbanisation. In 2022, 953 magpie pairs were recorded, with an average density of 8.8 pairs/km2 across the current administrative boundaries of Zielona Góra (without forests), and 27.7 pairs/km2 in strictly urbanised zones. The highest densities were in the old town (36.5 pairs/km2) and residential blocks (34.5 pairs/km2), while the peripheral areas had lower densities. The nests were mostly in coniferous trees, especially spruces, indicating a shift from poplars. The average nest height was 11.8 m, varying by habitat, with taller nests in the old town and parks. The key factors influencing nest density and placement included proximity to trash bins, water sources, and tall trees, reflecting the magpie’s adaptability to urban environments and reliance on anthropogenic resources.

This study investigates the changes in population size, distribution, and habitat preferences of the Eurasian magpie Pica pica in Zielona Góra over 23 years, emphasising the effects of urbanisation and habitat transformation. A comprehensive survey conducted in 2022 identified 953 magpie pairs, with an average density of 8.8 pairs/km2 across the current administrative boundaries of Zielona Góra (without forests), and 27.7 pairs/km2 in strictly urbanised zones. The highest densities were observed in the old town (36.5 pairs/km2) and residential blocks (34.5 pairs/km2), while peripheral areas, like allotment gardens and industrial zones, showed significantly lower densities. The nests were predominantly located in coniferous trees, especially spruces, marking a shift from the previously favoured poplars. The mean nest height was 11.8 m, varying by habitat type, with the highest nests found in the old town and parks. Environmental factors, such as proximity to trash bins, water sources, and tall trees, were significant predictors of nest density and placement. These findings underscore the magpie’s adaptability to urban environments, influenced by the availability of anthropogenic resources, habitat structure, and surrounding urban features.

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