naa a22 4500 510737323 CHVBK 20180411083015.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1007/s11284-013-1088-z doi (NATIONALLICENCE)springer-10.1007/s11284-013-1088-z Large 13C/12C and small 15N/14N isotope fractionation in an experimental detrital foodweb (litter-fungi-collembolans) [Elektronische Daten] [Anton Potapov, Eugenia Semenina, Alexander Kurakov, Alexei Tiunov] Correctly estimating the trophic fractionation factors (Δ15N and Δ13C) in controlled laboratory conditions is essential for the application of stable isotope analysis in studies on the trophic structure of soil communities. Laboratory experiments usually suggest large 15N/14N and small 13C/12C trophic fractionation, but in field studies litter-dwelling microarthropods and other invertebrates are consistently enriched in 13C relative to plant litter. In the present study, we report data from two laboratory experiments investigating both fungi-collembolans and litter-fungi-collembolans systems. In the fungi-collembolans system, Δ15N and Δ13C averaged 1.4±0.1 and 1.0±0.2‰, respectively. In microcosms with fungi-inoculated litter, the difference in δ15N between collembolans and plant litter averaged 1.5±0.2‰, confirming the relatively small 15N/14N trophic fractionation at the basal level of detrital foodwebs reported in numerous field studies. In full agreement with field observations, the difference in δ13C between bulk litter and collembolans in laboratory microcosms averaged 3.6±0.1‰ and only little depended on collembolan species identities or the presence of water-soluble compounds in the litter. We conclude that increased δ13C values typical of litter-dwelling decomposers are largely determined by an increased 13C content in saprotrophic microorganisms. The Ecological Society of Japan, 2013 Soil animals nationallicence Saprotrophic fungi nationallicence Stable isotopes nationallicence Trophic fractionation nationallicence Feeding ecology nationallicence Potapov Anton Department of Soil Biology, Soil Science Faculty, Moscow State University, Leninskie Gory 1-12, 111991, Moscow, Russia aut Semenina Eugenia Institute of Ecology and Evolution RAS, Leninsky Prospect 33, 119071, Moscow, Russia aut Kurakov Alexander Department of Soil Biology, Soil Science Faculty, Moscow State University, Leninskie Gory 1-12, 111991, Moscow, Russia aut Tiunov Alexei Institute of Ecology and Evolution RAS, Leninsky Prospect 33, 119071, Moscow, Russia aut Ecological Research Springer Japan 28/6(2013-11-01), 1069-1079 0912-3814 28:6<1069 2013 28 11284 https://doi.org/10.1007/s11284-013-1088-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11284-013-1088-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Potapov Anton Department of Soil Biology, Soil Science Faculty, Moscow State University, Leninskie Gory 1-12, 111991, Moscow, Russia aut NATIONALLICENCE 700 1- Semenina Eugenia Institute of Ecology and Evolution RAS, Leninsky Prospect 33, 119071, Moscow, Russia aut NATIONALLICENCE 700 1- Kurakov Alexander Department of Soil Biology, Soil Science Faculty, Moscow State University, Leninskie Gory 1-12, 111991, Moscow, Russia aut NATIONALLICENCE 700 1- Tiunov Alexei Institute of Ecology and Evolution RAS, Leninsky Prospect 33, 119071, Moscow, Russia aut NATIONALLICENCE 773 0- Ecological Research Springer Japan 28/6(2013-11-01), 1069-1079 0912-3814 28:6<1069 2013 28 11284 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer