Effects of temperature and life stage on the fatty acid composition of Collembola |
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| Affiliation: | 1. Institut für Zoologie, Technische Universität Darmstadt, Schnittspahnstrasse 3, 64287 Darmstadt, Germany;2. Department of Biochemistry and Microbiology, Cook College, Rutgers University, 76 Lipman Drive, New Brunswick, NJ 08901-8525, USA;1. Department of Biology, Western University, London, Ontario, Canada;2. Départment de biologie, Université de Sherbrooke, Sherbrooke, Québec, Canada;3. Départment de chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada;4. Department of Geosciences, Princeton University, Princeton, NJ, United States;1. Institute of Biology and Ecology, Faculty of Science, P. J. Šafárik University, Šrobárova 2, SK–04154 Košice, Slovakia;2. Institute of Soil Biology, Biology Centre AS CR v. v. i., Na Sádkách 7, CZ–37005 České Budějovice, Czech Republic;3. SOWA Research Infrastructure, Biology Centre AS CR v. v. i., Na Sádkách 7, CZ–37005 České Budějovice, Czech Republic;4. Centre for Polar Ecology, University of South Bohemia, Branišovská 31, CZ–37005 České Budějovice, Czech Republic;1. Sorbonne Universités, UPMC Univ Paris 06, CNRS, IRD, INRA, Institut d’écologie et des sciences de l’environnement (IEES), Paris, France;2. Ecole Normale Supérieure, PSL Research University, CNRS, Centre de recherche en écologie expérimentale et prédictive (CEREEP-Ecotron IleDeFrance), UMS 3194, 78 rue du château, 77140 Saint-Pierre-les-Nemours, France;3. Sorbonne Universités, Paris-Sorbonne Univ Paris 04, ESPE de l''académie de Paris, Paris, France;1. LOEWE Biodiversity and Climate Research Centre BiK-F, Senckenberganlage 25, 60325 Frankfurt/Main, Germany;2. ECT Oekotoxikologie GmbH, Böttgerstrasse 2-14, 65439 Flörsheim, Germany;3. Goethe University Frankfurt, Department Aquatic Ecotoxicology, Max-von-Laue-Str. 13, 60438 Frankfurt/Main, Germany |
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| Abstract: | Fatty acid (FA) analysis is used as a promising tool to investigate trophic interactions in soil food webs. The FA profile of neutral lipids in consumers is affected by the diet, and the occurrence and amount of certain FAs can reflect feeding strategies. We investigated the lipid composition of the Collembola Folsomia candida, Heteromurus nitidus and Protaphorura fimata with the fungus Chaetomium globosum as food source. The impact of environmental temperature and life stage was assessed, with special respect to linoleic acid (18:2ω6,9) as a marker FA for fungal feeding. In all Collembola species the ratio of C16/C18 in neutral lipid fatty acids (NLFAs) increased with decreasing temperature. In the NLFAs of F. candida and H. nitidus the Unsaturation Index and the amount of 18:2ω6,9 decreased with temperature, whereas in P. fimata effects were the opposite. The composition of phospholipid fatty acids (PLFAs) differed between species, but was little affected by temperature. The degree of unsaturation in NLFAs increased with the age of Collembola, mainly due to higher amounts of 18:2ω6,9 and a lower proportion of 18:1ω9. The biomarker linoleic acid represented over 20% of FAs in all fungal feeding Collembola. Despite considerable influence of temperature and life stage on its proportion, the amount was always higher than in individuals reared on other diets. This suggests that linoleic acid can serve as marker for fungal feeding independent of such physiological variations in Collembola. |
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