Multiyear data (2002-2015) on the biomasses of meio- and macrozoobenthic communities have been studied at different depths of a small lake in northern Karelia. A trend towards anti-phase changes in meio- and macrobenthic biomasses was observed and, as a consequence, the ratio between these components varied significantly in different years. Thus, inter-annual dynamics should be taken into account in analysis of hydrobiological data.