Consumption of Aquatic Subsidies by Soil Invertebrates in Coastal Ecosystems
D. I. KOROBUSHKIN1, A. Yu. KOROTKEVICH2, A. A. KOLESNIKOVA3, A. A. GONCHAROV1, A. A. PANCHENKOV1, A. V. TIUNOV1
1A. N. Severtsov Institute of Ecology аnd Evolution, RAS, 119071, Moscow, Leninsky ave., 33
2Moscow State Pedagogical University, 129164, Moscow, Kibalchicha str., 6
3Institute of Biology of the Komi Science Centre, UB RAS, 167982, Syktyvkar, Kommunisticheskaya str., 28
Keywords: макрофауна, мезофауна, стабильные изотопы, ОґC, ОґN, латеральный перенос, Окский заповедник, macrofaunа, mesofaunа, stable isotopes, lateral transfer, the Oksky Reserve
Abstract
Routs of aquatic allochthonous inputs (aquatic subsidies) to detrital food webs were studied, as well as the aquatic subsidies influence on the formation of the functional and taxonomic structure of soil invertebrate communities in coastal ecosystems. The study took place in the coastal zone of an oxbow lake of the Pra river in the Oksky Reserve. The obtained results indicated the strong dependence of soil animals in the coastal habitats on aquatic subsidies. The isotopic analysis showed that aquatic resources enter soil food webs not only via predators feeding on flying insects or aquatic prey, but also via saprophages decomposing organic debris of aquatic origin. The contribution of water subsidies to the energy balance of soil invertebrates decreased rapidly with the increasing distance from the lake. The fraction of ‘water carbon’ in the tissues of collembolans and saprophages was already negligible at a few meters from the water edge. The dependence of predatory invertebrates on the water resources could be traced at somewhat greater distance (tens of meters).
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