期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 38, 期 7, 页码 2004-2007出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2005.11.031
关键词
Collembola; neutral lipids; N-15; C-13; biomarker; fatty acid; bacteria; food source
类别
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, delta N-15, delta C-13, 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 cy 17:0 (E aerogenes, P. putida) and by 16:1 omega 5 (P. putida). (c) 2006 Elsevier Ltd. All rights reserved.
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