Emergence of amphibious insects from an old beaver pond in the Upper Khoper valley under the conditions of the Forest-Steppe
A. E. Silina1, N. N. Sushchik2,3, M. I. Gladyshev2,3, E. M. Kurina4, A. A. Kolmakova2, D. G. Seleznev5
1Reserve “Belogorye”, Borisovka, Russia
2Institute of Biophysics of Federal Research Center, “Krasnoyarsk Science Center”of Siberian Branch of RAS, Krasnoyarsk, Russia
3Siberian Federal University, Krasnoyarsk, Russia
4A. N. Severtsov Institute of Ecology and Evolution of RAS, Moscow, Russia
5Papanin Institute for Biology of Inland Waters of RAS, Borok, Russia
Keywords: amphibiotic insects, emergence, Upper Khoper basin, beaver pond, matter and energy removal, diversity, biogenic elements, polyunsaturated fatty acids (PUFAs)
Abstract
The work presents the results of studies of the emergence of amphibiotic insects from the old beaver pond on the Yuzhny stream of the “Privolzhskaya lesostep’” reserve in the Upper Khoper basin. For insects from 34 families and 8 orders, the indicators of abundance, biomass, frequency of occurrence are given, the timing of their emergence in different parts of the pond is indicated. The dominant and common species were identified - chironomids Paramerina cingulata (Walk.), Cricotopus silvestris (F.), biting midges (Bezzia bicolor (Mg.), chaoborids Chaoborus flavicans (Mg.) and mayflies Cloeon inscriptum (Bgtss.). The intensity of the emergence of insects was 12.10 ind./m2 per day, the average daily transfer of biomass was 49.23 mg/m2 per day. The analysis of the fatty acid composition and content of the main biogenic elements in adults of amphibiotic insects was carried out. The results of calculations of the removal of energy and matter, including biogenic elements (carbon, phosphorus, nitrogen) and polyunsaturated fatty acids during the emergence of insects from various orders (Ephemeroptera, Odonata, Trichoptera and Diptera) into adjacent terrestrial ecosystems. The transfer of raw biomass from water to land was 7.385 g/m2 per year, in dry weight - 2.216 g/m2 per year; transfer of the main nutrients - 1.21 g/m2 per year - carbon, 0.25 g/m2 per year - nitrogen, and 0.03 g/m2 per year - phosphorus; PUFA transfer - 24.16 kg/km2 per year.
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