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Trophic shift of stable isotopes and fatty acids in Collembola on bacterial diets |
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| Authors: | Dominique Haubert Max M Häggblom Stefan Scheu |
| Institution: | a Institute of Zoology, Technical University of Darmstadt, Schnittspahnstr. 3, 64287 Darmstadt, Germany b Department of Biochemistry and Microbiology, Cook College, Rutgers University, 76 Lipman Drive, New Brunswick, NJ 08901-8525, USA c Kompetenzzentrum Stabile Isotope, Forschungszentrum Waldökosysteme, Georg-August University Göttingen, Büsgenweg 2, 37077 Göttingen, Germany d Institute of Soil Science, Soil Biology Group, University of Hohenheim, Emil-Wolff-Str. 27, 70599 Stuttgart, Germany |
| Abstract: | Fatty acid (FA) analysis is a promising tool to study trophic relationships in soil food webs. We determined FA biomarkers to trace bacterial food sources (Bacillus megaterium, Pseudomonas putida, Enterobacter aerogenes) of Collembola (Heteromurus nitidus, Protaphorura fimata, Folsomia candida). In addition, δ15N, δ13C, C/N ratio, body weight and NLFA/PLFA ratio (neutral lipid/phospholipid fatty acids) of Collembola were assessed. These measures indicated that P. putida ranked first, B. megaterium second and E. aerogenes third in food quality. FAs specific for bacteria were found in the NLFAs of the Collembola reflecting the respective bacterial diet. Biomarker FAs for gram-positive bacteria were methyl branched i14:0, i15:0, a15:0 and i17:0. Consumption of gram-negative bacteria was reflected by the cyclic form cy17:0 (E. aerogenes, P. putida) and by 16:1ω5 (P. putida). |
| Keywords: | Collembola Neutral lipids 15N 13C Biomarker Fatty acid Bacteria Food source |
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