Abstract
Abstract Quantitative sampling of macrozoobenthos has been performed in the southern Baltic in the 1920s and the 1950s. Some of these stations (43) were revisited in 1982/83. The total abundance and biomass was significantly increased in 1982/83 compared to 1921. A small, non-significant, increase in biomass was found in 1982/83 compared to the 1950s. It is suggested that the main part of the biomass increase might be due to reduced stocks of predatory flatfishes in the 1920s and 1930s. The most conspicuous difference in the comparisons is the widespread distribution of the polychaete Capitella capitata in 1982/83. This is attributed to increased trawling activities in recent decades and not to organic enrichment.
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