TY - GEN A1 - Hansson, L. N1 - The formation of trials on the snow surface and the digging of tunnels up to the snow surface by field voles Mictorus agrestis was studied in order to establish their usefulness and indicators of density. L1 - http://rcin.org.pl/Content/11187/PDF/BI002_2613_Cz-40-2_Acta-T31-nr29-401-408_o.pdf M3 - Text VL - 31 CY - Białowieża PY - 1986 IS - 29 EP - 408 KW - density KW - Microtus agrestis KW - snow trails KW - snow tunnels KW - ślady na śniegu KW - zagęszczenie osobników KW - Nornik bury SP - 401 T1 - Vole snow trails and tunnels as density indicators UR - http://rcin.org.pl/dlibra/publication/edition/11187 ER -