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The new data on the distribution of the medicinal leech (Hirudo medicinalis L.) in Poland, collected in the years 1999-2007 during several hydrobiological and batrachological studies in many regions of Poland, are presented. In total, 87 new records were found, which doubled the number of contemporary known localities. Habitat preferences and protected status of this species in Poland are discussed.
Studies on molluscs of selected water bodies of the city of Szczecin (NW Poland), carried out in 1997, revealed the occurrence of 11 snail and 5 bivalve species. Two groups of water bodies were distinguished, of different species composition: Głębokie lake on one hand and the ponds with the Osówka stream on the other. Overall dominants were Potamopyrgus antipodarum (Gray), an expanding species, and...
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