Abstract
Macroinvertebrate communities which were formed in isolates with free-floating duckweed plants of the species Spirodella polyrhiza (L.) Schleid, Lemna minor L., Wolffia arrhiza (L.) Horkel ex Wimm, mixtures of these species, and an isolate with crushed styrofoam were studied in comparison to the control aggregation of floating plants in a small forest lake located in the Usman pine forest (Voronezh oblast, Russia) during the vegetation season of 2011. The seasonal dynamics of the biomass of Lemnaceae in isolates differed significantly from the control aggregation. The isolation negatively affected the growth of Lemnaceae, but had a positive effect on the development of the macroinvertebrate communities. Statistically significant differences in the abundance, biomass, and the number of species in phytophilic communities were not found between experimental isolates and in comparison to the control. Differences in the species composition of macroinvertebrate communities of surface-floating substrates were determined to a greater degree by characteristics of a waterbody than of the substrate.
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