Abstract
During July and Aug. 1970 and 1971, 162 spp. of nematodes were collected in various tundra types on the Taimyr peninsula [USSR]. They were divided into 5 ecological groups. Bacteria-eating nematodes were dominant. The percentage of plant parasites was high in the herb/grass stands. The variation in abundance was generally very high and reached a factor of 100, while biomass varied by a factor of 250. Abundance was highest in the herb/grass stands. Generally, nematodes constitute the dominant part of the soil biocenoses in the Arctic tundra.