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This is the fi rst study on the woodlouse fauna of from 5 nature reserves in the Mazowian Lowland (Bukowiec
Jabłonowski, Mosty Kalińskie, Łosiowe Błota, Jezioro Kiełpińskie, Klimonty) and from 2 nature reserves in the
Pomeranian Lake District (Ustronie, Dolina Huczka) are presented. A total of 8 species of woodlice were found.
The number of collected species ranged from 1 (Dolina Chuczka, Mosty Kalińskie, Klimonty) to 5 (Łosiowe
Błota). The most common species in the all studied reserves was Trachelipus rathkii.