On data of the Parents Sea and some regions of the Kara, White, Norwegian and Greenland Seas transregional study, carried out in 1991-1992, concentrations of various contaminants in benthic algae and invertebrates are defined. According to the results of two-way ANOVA the conclusion about the absence of spatial variability in concentrations of POP, TM and K-40 in the investigated shelf biota is done. Concentrations of the analysed substances in organisms and the differences in contaminant bioaccumulation by plants and animals of various taxons are presented in a form of a table, In spite of the discrepant information about the background level of contamination, given by different authors, the obtained data to a greater degree corresponds to the idea of the background concentration of contaminants in biota, than testify to the man-induced pollution of the investigated area. (C) 1998 Elsevier Science Ltd. All rights reserved.