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Estimates Of Macroinvertebrate Biomass In Lake Michigan, Thomas F. Nalepa

United States Department of Commerce: Staff Publications

To obtain updated, more accurate estimates of macroinvertebrate standing stocks in Lake Michigan, benthic biomass (ash-free dry weight) was determined at 40 stations in the southern end of the lake in 1980 and 1981. Biomass generally increased as sampling depth increased from 16 to 30 m, peaked at depths of 30-40 m, and then declined at depths greater than 40 m. Mean total biomass at the 16-30 m, 31-50 m, 51-90, and> 90 m depth intervals was 4.9, 7.8, 4.2, and 1.9 g m^-2, respectively. Oligochaetes (46%) and Pontoporeia hoyi (44%) accounted for most of the biomass at …