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Small mammals in the diet of the Tawny Owl (Strix aluco L.) in Central European Lowland

Żmihorski M., Balciauskiene L., Romanowski J.

Polish Journal of Ecology

2008

Vol. 56, nr 4

693-700

We analysed the variation of small mammal species composition in the Tawny Owl Strix aluco L. diet in forest habitats of Central European Lowland. We used published and unpublished materials from forest-dominated landscapes in Lithuania (n = 7 locations), Poland (n = 8) and East Germany (n = 1); marginal localities were ca. 870 km from each other. We recorded that in Central European Lowland the proportion of Arvicolidae in the Tawny Owl diet significantly increased, while that of Muridae decreased toward north-east. The proportion of less common rodent species (including Gliridae and Sicita betulina Pallas) in the diet also increased significantly toward NE. We did not record any trend of small mammals diversity along the analysed transect. We suggest that the change of Arvicolidae to Muridae ratio toward north-east can be caused by the replacement of mice with boreal vole species in small mammal community. Small mammal diversity in Central Europe is subject of discussion.

Selected heavy metals in bones of small mammals inhabiting the Szczecin Lagoon shores

Miłek E., Musielak D.

Chemia i Inżynieria Ekologiczna

2005

Vol. 12, nr 12

1395-1400

Contents of selected heavy metals (Pb, Co, and Cd) in bones of small mammals of the families Soricidae, Arvicolidae, and Muridae were determined. The mammals were collected from areas designated as Natura 2000 sites on the Szczecin Lagoon (north-west Poland) as well as from some other sites, including those in major towns. The bones assayed were isolated from pellets of the bam owl Tyto alba (Scop., 1769) and common kestrel Falco tinnunculus (L., 1758). Heavy metal contents were determined with atomic absorption spectrophotometry. The data evidence considerable differences in lead, cadmium, and copper contents between samples collected from various sites.

W niniejszej pracy badano zawartość wybranych metali ciężkich (Pb, Cu i Cd) w układzie kostnym drobnych ssaków z rodzin Soricidae, Arvicolidae i Muridae. Badane próby pochodziły z obszarów wchodzących w skład Natura 2000, położonych nad Zalewem Szczecińskim (północno-zachodnia Polska), a także z kilku innych stanowisk, między innymi z większych aglomeracji miejskich. Materiał kostny pozyskano ze zrzutek sowy płomykówki Tyto alba (Scop., 1769), oraz sokoła pustułki Falco tinnuculus (L., 1758). Stężenie pierwiastków zostało oznaczone przy użyciu spektofotometrii absorbcji atomowej. Wyniki badań wykazały znaczące różnice w zawartości ołowiu, kadmu i miedzi w próbach z poszczególnych stanowisk.