PL
Dnia 25 lutego 2012 roku przeprowadzono liczenia nietoperzy w trzech jaskiniach: Józefa, Rysia i Spełnionych Marzeń, usytuowanych około 1 km na zachód od miejscowości Rodaki (gmina Klucze, powiat olkuski). W Jaskini Józefa stwierdzono zimowanie 14 nocków orzęsionych Myotis emarginatus (Geoffroy, 1806). Stanowisko to jest jednym z liczniejszych zimowisk tego gatunku w Polsce oraz jedynym obecnie znanym i tak licznym na Wyżynie Częstochowskiej
EN
The paper presents the results of the winter bat census from three newly discovered caves (Józefa Cave, Rysia Cave, Spełnionych Marzeń Cave) in the Kraków-Częstochowa Upland. Among hibernating individuals, 14 Geoffroy’s bats Myotis emarginatus - one of the rarest species in the Polish bat fauna - were found. Hibernacula of this species are known from caves and mines of the Kraków-Częstochowa Upland, the Sudetes and the Carpathians. Niedźwiedzia Cave with 44 individuals (Furmankiewicz et al. 2008) is the biggest hibernacula in Poland. Geoffroy’s bat was observed in large numbers also in Racławicka Cave, Nietoperzowa Cave and Oblica Cave (Nowak, Grzywiński 2007; Mleczek, Gubała 2007). A total of 14 individuals of Geoffroy’s bat were noted during the census on the 25th of February 2012 in Józefa Cave. Species were not observed near Rysia Cave and Spełnionych Marzeń Cave (Table 1). Józefa Cave is situated 13.5 km from the nursery colony (about 530 individuals) in the church in Sławków (Węgiel et al. 2010). The new sites of Geoffroy’s bat may prove that the population of this species is stable throughout the northern limit range. The increased number of Geoffroy’s bats may force the species to migrate to new areas. Such a phenomenon was already observed in the Czech Republic (Sachanowicz 2010). This newly discovered location is currently the only known and the largest wintering location of the aforementioned species in this part of the Częstochowa Upland