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Contemporary Problems of Ecology

2016 year, number 4

Substance and Energy Flows Formed by the Emergence of Amphibiotic Insects Across the Water-Air Boundary on Floodplain Lakes of the Volga River

I. V. DJOMINA1, M. V. YERMOKHIN2, N. V. POLUKONOVA3
1Saint Petersburg State University, 199034, Saint Petersburg, Universitetskaya emb., 7-9
2Saratov State University, 410012, Saratov, Astrakhanskaya str., 83
3Saratov State Medical University, 410012, Saratov, Bolshaya Kazachya str., 112
Keywords: амфибиотические насекомые, пойменные озера, потоки биомассы, потоки энергии, биогенные элементы, хирономиды, amphibiotic insects, floodplain lakes, imago emergence, substance flow, energy flow, biogenic elements, midges

Abstract

The substance flow across the water-air boundary on the floodplain lake Kholodnoye (Saratov Oblast) is generally formed by the Culicomorpha (76.1 %) and accounts for 0.35 g/m2 of the lake area per year. The energy flow amounts to 1.87 kcal/m2, and its most part accounts for the second half of summer and autumn. Annual removal of biogenic elements: 0.18 g/m2 for carbon, 0.04 g/m2 for nitrogen, 0.004 g/m2 for phosphorus. The greatest contribution to flows of substance and energy is brought by large species of midges, as well as phantom midges and medium-sized midges which produce several generations within a year and reach high abundance at a larval stage. Other floodplain lakes of the Volga river with similar biotopical features and species composition of amphibiotic insects are characterized by a quantitatively similar level of exchange processes with adjacent land ecosystems across the water-air boundary.