Bacterial community composition and diversity respond to nutrient amendment but not warming in a southern maritime Antarctic soil

Newsham, Kevin K. ORCID: https://orcid.org/0000-0002-9108-0936; Tripathi, Binu M; Dong, Ke; Yamamoto, Naomichi; Adams, Jonathan M; Hopkins, David W. 2019 Bacterial community composition and diversity respond to nutrient amendment but not warming in a southern maritime Antarctic soil. Microbial Ecology, 78 (4). 974-984. 10.1007/s00248-019-01373-z

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	Text This is a post-peer-review, pre-copyedit version of an article published in Microbiol Ecology. The final authenticated version is available online at: https://doi.org/10.1007/s00248-019-01373-z Newsham et al._resubmitted version_8 March 2019.doc - Accepted Version Download (184kB)
Preview	Image This is a post-peer-review, pre-copyedit version of an article published in Microbiol Ecology. The final authenticated version is available online at: https://doi.org/10.1007/s00248-019-01373-z Newsham et al._Fig. 1..TIF - Supplemental Material Download (495kB) | Preview
Preview	Image This is a post-peer-review, pre-copyedit version of an article published in Microbiol Ecology. The final authenticated version is available online at: https://doi.org/10.1007/s00248-019-01373-z Newsham et al._Fig. 2.TIF - Supplemental Material Download (701kB) | Preview
Preview	Image This is a post-peer-review, pre-copyedit version of an article published in Microbiol Ecology. The final authenticated version is available online at: https://doi.org/10.1007/s00248-019-01373-z Newsham et al._Fig. 3.TIF - Supplemental Material Download (1MB) | Preview

Abstract/Summary

A resumption of climate warming in maritime Antarctica, arising from continued greenhouse gas emissions to the atmosphere, is predicted to lead to further expansions of plant populations across the region, with consequent increases in nutrient inputs to soils. Here, we test the main and interactive effects of warming, applied with open top chambers (OTCs), and nutrient amendment with tryptic soy broth (TSB), an artificial growth substrate, on bacterial community composition and diversity using Illumina sequencing of 16S rRNA genes in soil from a field experiment in the southern maritime Antarctic. Substantial effects of TSB application on bacterial communities were identified after 49 months, including reduced diversity, altered phylogenetic community assembly processes, increased Proteobacteria-to-Acidobacteria ratios and significant divergence in community composition, notably increases in the relative abundances of the gram-positive genera Arthrobacter, Paeniglutamicibacter and Planococcus. Contrary to previous observations from other maritime Antarctic field warming experiments, we recorded no effects of warming with OTCs, or interactive effects of OTCs and TSB application, on bacterial community composition or diversity. Based on these findings, we conclude that further warming of the maritime Antarctic is unlikely to influence soil bacterial community composition or diversity directly, but that increased nutrient inputs arising from enhanced plant growth across the region may affect the composition of soil bacterial communities, with possible effects on ecosystem productivity.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1007/s00248-019-01373-z
ISSN:	0095-3628
Additional Keywords:	Antarctica, bacterial community composition, climate warming, Gram positive and Gram negative bacteria, nutrient input, Proteobacteria to Acidobacteria ratio
Date made live:	23 Apr 2019 10:05 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/521457

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