EN
The objective of the study was to determine the species composition and structure of carabid beetles, which may have some effect on reducing the abundance of pest insects colonizing winter oilseed rape plantations. The experiment was conducted in Tomaszkowo near Olsztyn (UTM DE 65) in 2005–2006. Four fields cropped with winter oilseed rape were included to the study. The fauna material was captured with Barber traps. During the two-year observations, 3038 individuals belonging to 70 species of Carabidae were caught. It was shown that oilseed rape did not possess stable assemblages of Carabidae that would be characteristic for this crop alone, as the analyzed fields were populated by completely distinct beetle communities, different in the species composition and dominance relationships. Nonetheless, each of the assemblages was characterized by quite a high species richness and abundance of carabid beetles.