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The effect of anthropogenic arsenic contamination on the earthworm microbiome

Pass, Daniel Antony, Morgan, Andrew John, Read, Daniel S., Field, Dawn, Weightman, Andrew John and Kille, Peter 2015. The effect of anthropogenic arsenic contamination on the earthworm microbiome. Environmental Microbiology 17 (6) , pp. 1884-1896. 10.1111/1462-2920.12712

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Abstract

Earthworms are globally distributed and perform essential roles for soil health and microbial structure. We have investigated the effect of an anthropogenic contamination gradient on the bacterial community of the keystone ecological species Lumbricus rubellus through utilizing 16S rRNA pyrosequencing for the first time to establish the microbiome of the host and surrounding soil. The earthworm-associated microbiome differs from the surrounding environment which appears to be a result of both filtering and stimulation likely linked to the altered environment associated with the gut micro-habitat (neutral pH, anoxia and increased carbon substrates). We identified a core earthworm community comprising Proteobacteria (∼50%) and Actinobacteria (∼30%), with lower abundances of Bacteroidetes (∼6%) and Acidobacteria (∼3%). In addition to the known earthworm symbiont (Verminephrobacter sp.), we identified a potential host-associated Gammaproteobacteria species (Serratia sp.) that was absent from soil yet observed in most earthworms. Although a distinct bacterial community defines these earthworms, clear family- and species-level modification were observed along an arsenic and iron contamination gradient. Several taxa observed in uncontaminated control microbiomes are suppressed by metal/metalloid field exposure, including eradication of the hereto ubiquitously associated Verminephrobacter symbiont, which raises implications to its functional role in the earthworm microbiome.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QR Microbiology
Publisher: Wiley-Blackwell
ISSN: 1462-2912
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 7 November 2014
Last Modified: 19 Mar 2019 23:02
URI: http://orca-mwe.cf.ac.uk/id/eprint/69904

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