Search for: [Abstract = "Various signs were studied of the activity of snails connected with the production and transformation of detritus by these animals. Most of the species studied were found to prefer feeding on vegetable detritus and periphyton, and to avoid living macrophytes. Preferred food was at the same time better assimilated. The rate of circadian defecation has been determined for different snail species. Submerged\-macrophyte\-dwelling snails in the Mikołajskie Lake were found to excrete as much as 90% of the total amount of gastropod faeces present there. Food remnants, damaged and discarded during the foraging also appeared to be an important source of detritus."]

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