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Contaminant inhibited feeding rate of mollusks and matter transfer in microcosm: effects of a synthetic surfactant on Lymnaea stagnalis. Загрязняющее воду вещество (ПАВ) снижает скорость питания моллюсков и связанный с этим перенос вещества. - см статью:

Ostroumov S. A., Kolesnikov M. P. Biocatalysis of matter transfer in a microcosm is inhibited by a contaminant: effects of a surfactant on Lymnaea stagnalis. - Doklady Biological Sciences, Vol. 373, 2000, pp. 397–399. [Translated from Doklady Akademii Nauk (DAN), Vol. 373, No. 2, 2000, pp. 278–280].

--Pellet excretion by  the gastropods Lymnaea stagnalis feeding on the  phytomass of macrophytes (such as Nuphar lutea) was as high as 4–7 mg  dry weight per 1 gram wet weight of  the mollusks per 72 h.  Pellet sedimentation contribute to vertical transfer of chemical elements in the ecosystem. The pellet composition depended on the species of the plants eaten by the mollusks. When the gastropods L. stagnalis feed on N. lutea, the pellets contain, in addition to organic and inorganic carbon, nitrogen (N, 2.3–2.9%), phosphorus (P, 0.4–0.5%), and silicium (Si, 1.1–1.9%). The relative silicium content may be 30% higher than in the food phytomass.  The surfactant tetradecyltrimethylammonium bromide (TDTMA, 2 mg/L) inhibited the feeding rate of the mollusks and pellet production, their accumulation at the bottom of microcosms, and the matter transfer connected with this. The data obtained demonstrated a new aspect of  the ecological hazard due to environmental pollution with TDTMA and other quaternary ammonium compounds at sublethal concentrations.  According to the author opinion,  other contaminants may also suppress pellet production, their accumulation at the bottom, and the matter transfer associated with that.

--KEY WORDS: gastropods, Lymnaea stagnalis, Radix ovata,  Physa fontinalis, Nuphar lutea, Taraxacum officinale, tetradecyltrimethylammonium bromide, TDTMA, mollusks,  pellet sedimentation, vertical transfer, chemical elements, aquatic ecosystem, nitrogen, phosphorus, silicium, Si, ecological hazard, environmental pollution, pollutant, synthetic surfactant, tensides, quaternary ammonium compounds, sublethal concentrations,  contaminants, matter transfer, xenobiotics, toxicity, bioassay, microcosm, detritus, feeding rate, invertebrates, water self-purification;  тетрадецилтриметиламмонийбромид, ТДТМА, моллюски,  седиментация, пеллеты, вертикальныйперенос, химическиеэлементы, водныеэкосистемы, азот, фосфор, кремний, Si, экологическаяопасность, загрязнениеокружающейсреды, поллютанты, синтетическоеповерхностно-активноевещество, ПАВ, катионныеповерхностно-активныевещества, четвертичныесоединенияаммония, сублетальныеконцентрациизагрязняющихвеществ, переносвещества, ксенобиотики, токсичность, микрокосм, детрит, скоростьпитания, беспозвоночные, самоочищениеводы;

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