期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 52, 期 -, 页码 33-42出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2012.04.018
关键词
Bacterial energy channel; Basal resources; Fatty acid analysis; Forest soil food web; Fungal energy channel; Geophilomorpha; Lithobiomorpha; NLFAs; Predators
类别
资金
- DFG [1374]
Fatty acid (FA) analysis investigates changes in the relative contribution of prey from major energy channels in decomposer food webs for predator nutrition. Adopting this approach we investigated whether the trophic niche of centipedes, as major invertebrate predators in forest soil food webs, changes with maturation, season or forest age. Generally, each of the four centipede species studied differed significantly in their FA composition suggesting trophic niche differentiation. FA profiles differed more strongly in the two geophilomorph (Strigamia acuminata and Geophilus ribauti) than in the two lithobiomorph species (Lithobius crassipes and Lithobius mutabilis) suggesting that in particular the former feed on markedly different prey. FA profiles changed during post-embryonic development in each of the four centipede species. Differences were most pronounced in the two lithobiomorph species shifting to predominantly fungal feeding prey. Further, FA profiles varied with season indicating that centipedes exploit more prey out of the bacterial channel in autumn. FA profiles of centipedes varied little with forest age suggesting that soil food webs are remarkably invariant across different forest ecosystems. The results indicate that FA composition of second order consumers closely reflects changes in diet of prey species and composition of basal resources. The study proved FA profiles as powerful tool to gain insight into critical characteristics of soil food web stability, i.e., compartmentalisation and the relative importance and variability of energy channels. (C) 2012 Elsevier Ltd. All rights reserved.
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