Macrobenthic infauna collections were made to investigate potential changes in community structure (abundance, biomass, diversity) in the Chirikov Basin, northern Bering Sea between 1986 and 2002; one of the biomass hot spot region in the Arctic. Two cruises to the Chirikov Basin were conducted in the years 1986 and 2002 with the R/V/ Alpha Helix. Samples were taken at the same 20 stations during ... both cruises, 15 of which were included in this study. Infauna was collected at each station with a 0.1m2 van Veen grab. Total abundance ranged from 343-13,373 individuals m-2 in 1986 and from 1093-11,418 individuals m-2 in 2002. Biomass ranged from 20-515g wet weight m-2 in 1986 and from 62-1694g wet weight m-2 in 2002. Total abundance and biomass in the Chirikov Basin were dominated by amphipods of the family Ampeliscidae. Other abundant taxa were other Crustacea, Mollusca and Polychaeta. Overall, a trend (though not statistically significant at all stations) for hi gher abundance and biomass was observed in 2002 compared to 1986. This thesis is part of a larger study in the Chirikov Basin that focused on ampeliscid amphipods only (Coyle et al, Deep-Sea Research II, scheduled for December 2007). This study used the WORMS and ITIS databases for the taxonomic information. Estimates of abundance are not corrected for detectability.