Аннотация:Tupikova N.V., Emelyanova L.G. Methods of Counting Lemmings in Unenclosed Plots
Counts of Lemmus sibiricus Kerr., 1792 and Dicrostonyx torquatus Pall., 1779 were carried out in 1973 in a subzone of Southern Yamal tundras during July-August (period of maximum abundance). The animals were counted on unisolated 0,25 ha plots with Gero traps. When 400 traps per plot were used the number of trapped lemmings sharply decreased after 1-3 days, which was considered as evidence of the capture of all the inhabitans of the plot. This correspondsto an average density of 120 (72-324) L. sibiricus and of about 25 (0-72) D. torquatus, per 1 ha. To obtain more reliable values more traps have to be used, so that the trapping may be completed within 24 hours.