Spatial activity and homing of bank voles Clethrionomys glareolus (Schreber, 1V801 have been studied in the 100 years old alder wood (Carici elongatae-Alnelum Koch, 1926) in the Kampinos National Park near Warsaw. Six parallel trap lines of 600 m each were set. Each of external lines consisted of 100 live-traps. Between the two lines, <1 lines of 200 snap-traps in each were set at 100 m intervals. Individuals caught m live-traps were individually marked and released in the centre of the study area. During the study 613 bank voles were marked and 424 recaptures were recorded. Considerable mobility of animals was found (a high proportion of animals moved more than 600 m). Distribution of animals retrapped made it possible to determine hypothetical spatial patterns of homing. It is suggested that familiarity with the given area acquired during long distance movements help small mammals to find their way when homing regard" less of the nature of homing. Catholic University of Lublin, Al. Racławickie 14, 20-950 Lublin, Poland (RA); Department of Game Management, Agriculture University of Warsaw, Rakowiecka 26/30, 02-528 Warsaw, Poland (JB-W); Kampinos National Forest, Tetmajera 38, 05-080 Izabelin, Poland (EO); National Foundation for Environment Protection, Krzywickiego 9, 0U-078 Warsaw, Poland (AL, JS)
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