Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.1134/S1062359021080070

Ключевые слова: primary and secondary production, carbon, nitrogen, phosphorus, phyto- and zooplankton, fish, eutrophic conditions, efficiency of substance transfer, mesocosm

Аннотация: The efficiency of the transfer of carbon, polyunsaturated fatty acids (PUFA), nitrogen, and phosphorus from phytoplankton to zooplankton determines the functioning of the entire ecosystem. However, this parameter depends on environmental conditions. Fish as a very important factor regulating planktonic communities very likely affect the efficiency of the transfer of basic elements and substances from phytoplankton to zooplankton. In experimental mesocosms filled with water from a eutrophic lake and containing phyto- and zooplankton, we investigated how fish affect both primary and secondary production and the efficiency of transfer of carbon, nitrogen, phosphorus, PUFA, and fatty acids (FAs) from phytoplankton to zooplankton. Two treatments (control and fish treatment) were repeated in three replicates. The transfer efficiency of substances from phytoplankton to zooplankton was measured as the ratio of secondary production to primary production expressed per L and per unit of biomass. The efficiency expressed per L characterizes the productivity of the water body, while the efficiency expressed per unit of biomass indicates the effectiveness of aquatic species to transfer biologically valuable substances from one trophic level to another. We found that phytoplankton-zooplankton-fish interface is determined not only by predator-prey relationships, but are also affected by the quality of both phytoplankton and zooplankton in terms of contents of phosphorus, nitrogen, PUFA, and FAs in their biomass. We showed that, in the presence of fish, the transfer efficiency of carbon, phosphorus, nitrogen, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and FAs per unit of biomass from phytoplankton to zooplankton was increased twofold, 12.4-fold, 2.5-fold, 12.4-fold, 7.4-fold, and tenfold, respectively, relative to the control. This facilitates sustainable functioning of the ecosystem under fish pressure. Such a mechanism prevents zooplankton over-exploitation by fish and enlarges the food chain.

Журнал: BIOLOGY BULLETIN

Выпуск журнала: Vol. 48, Is. 8

Номера страниц: 1284-1297

Место издания: PLEIADES PUBLISHING INC

Издатель: 3

• Feniova I.Yu (Russian Acad Sci, Severtsov Inst Ecol & Evolut, Moscow 119071, Russia)
• Sakharova E.G. (Russian Acad Sci, Papanin Inst Biol Inland Waters, Borok 152742, Russia)
• Gladyshev M.I (Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Fed Res Ctr,Inst Biophys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Russia 660041, Russia)
• Sushchik N.N. (Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Fed Res Ctr,Inst Biophys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Russia 660041, Russia)
• Gorelysheva Z.I (Natl Acad Sci Belarus, Sci & Pract Ctr Bioresources, Minsk 220072, BELARUS)
• Karpowicz M. (Univ Bialystok, Inst Biol, Dept Hydrobiol, PL-15245 Bialystok, Poland)

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