Journal
APPLIED SOIL ECOLOGY
Volume 98, Issue -, Pages 103-111Publisher
ELSEVIER
DOI: 10.1016/j.apsoil.2015.10.002
Keywords
Bacterial communities; Bacterial diversity; Bar-coded pyrosequencing; Earthworms; Eisenia andrei; Decomposition
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Funding
- Ministerio de Economia y Competitividad [CTM2013-42540-R]
- Xunta de Galicia [CN2012/305]
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Earthworms play a key role during the first stage of decomposition by enhancing the activity of microorganisms. As organic matter passes throughout the earthworm gut, nutrient pools and microbial communities are modified and released in casts. Here we used 16S rRNA pyrosequencing and metagenomic analysis to characterize the bacterial communities of casts from the earthworm Eisenia andrei fed with different food sources (cow, horse and pig manure). We found that the bacterial communities of cast strongly depended on the food source ingested by earthworms; although, no differences in a-diversity were detected. Bacterial communities of casts were mainly comprised of a variable amount of OTUs (operational taxonomic unit) belonging to the phyla Proteobacteria, Firmicutes, Actinobacteria and Bacteroidetes, with minor contributions from the phyla Verrucomicrobia, Chloroflexi, Hydrogenedentes, Latescibacteria, Planctomycetes and Candidatus Saccharibacteria. From these bacterial profiles we found OTUs that worked out as biomarkers for each bacterial community allowing us to discriminate among food sources. (C) 2015 Elsevier B.V. All rights reserved.
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