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Contemporary Problems of Ecology

2016 year, number 4

Fluxes of Biomass and Essential Polyunsaturated Fatty Acids from Water to Land Via Chironomid Eemergence from a Mountain Lake

E. V. BORISOVA1, O. N. MAKHUTOVA2, M. I. GLADYSHEV1,2, N. N. SUSHCHIK1,2
1Siberiаn Federal University, 660041, Krasnoyarsk, Svobodny ave., 79
2Institute of Biophysics, SB RAS, 660036, Krasnoyarsk, Akademgorodok, 50/50
Keywords: вылет амфибионтных насекомых, Chironomidae, горный ландшафт, полиненасыщенные жирные кислоты, биогенные потоки вещества “вода-суша”, amphibiotic insect emergence, Chironomidae, mountain landscape, polyunsaturated fatty acids, biogenic fluxes from water to land

Abstract

The taxonomic composition, seasonal dynamics, and emergence intensity of Chironomidae adults that emerged from mountain oligotrophic lake Oiskoe (the Western Sayan, Southern Siberia) were established. The value of annual emergence of chironomid adults averaged 0.42 g wet weight m2 in the lake area and approached the value of potential emergence which was calculated based on the estimation of zoobenthos secondary production. For the first time, fatty acid composition and the contents of essential omega-3 polyunsaturated fatty acids (PUFA) were compared between the larvae and adult stages of chironomids. The PUFA content per wet weight unit in adults was more than 7-fold higher as compared to that in larvae. The PUFA flux per lake area unit resulting from the chironomid emergence accounted for 1.752 mg/m x y, that is more than 10 times lower than the global estimation of axport through the amphibiotic insect emergence. Calculations showed that the PUFA flux brought with the chironomid emergence per land unit of the studied mountain territory was very low as compared to that for other landscapes. However, the calculated flux per land unit within the first 15 m of the shoreline was much higher and similar to that in productive landscapes.