Climate oscillations reflected within the microbiome of Arabian Sea sediments

Abstract Selection of microorganisms in marine sediment is shaped by energy-yielding electron acceptors for respiration that are depleted in vertical succession. However, some taxa have been reported to reflect past depositional conditions suggesting they have experienced weak selection after burial...

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Autores principales:	William D. Orsi, Marco J. L. Coolen, Cornelia Wuchter, Lijun He, Kuldeep D. More, Xabier Irigoien, Guillem Chust, Carl Johnson, Jordon D. Hemingway, Mitchell Lee, Valier Galy, Liviu Giosan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3bc74f0f1e6e4bb9a8ac21a3fe65b03b
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spelling	oai:doaj.org-article:3bc74f0f1e6e4bb9a8ac21a3fe65b03b2021-12-02T12:30:46ZClimate oscillations reflected within the microbiome of Arabian Sea sediments10.1038/s41598-017-05590-92045-2322https://doaj.org/article/3bc74f0f1e6e4bb9a8ac21a3fe65b03b2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05590-9https://doaj.org/toc/2045-2322Abstract Selection of microorganisms in marine sediment is shaped by energy-yielding electron acceptors for respiration that are depleted in vertical succession. However, some taxa have been reported to reflect past depositional conditions suggesting they have experienced weak selection after burial. In sediments underlying the Arabian Sea oxygen minimum zone (OMZ), we performed the first metagenomic profiling of sedimentary DNA at centennial-scale resolution in the context of a multi-proxy paleoclimate reconstruction. While vertical distributions of sulfate reducing bacteria and methanogens indicate energy-based selection typical of anoxic marine sediments, 5–15% of taxa per sample exhibit depth-independent stratigraphies indicative of paleoenvironmental selection over relatively short geological timescales. Despite being vertically separated, indicator taxa deposited under OMZ conditions were more similar to one another than those deposited in bioturbated intervals under intervening higher oxygen. The genomic potential for denitrification also correlated with palaeo-OMZ proxies, independent of sediment depth and available nitrate and nitrite. However, metagenomes revealed mixed acid and Entner-Dourdoroff fermentation pathways encoded by many of the same denitrifier groups. Fermentation thus may explain the subsistence of these facultatively anaerobic microbes whose stratigraphy follows changing paleoceanographic conditions. At least for certain taxa, our analysis provides evidence of their paleoenvironmental selection over the last glacial-interglacial cycle.William D. OrsiMarco J. L. CoolenCornelia WuchterLijun HeKuldeep D. MoreXabier IrigoienGuillem ChustCarl JohnsonJordon D. HemingwayMitchell LeeValier GalyLiviu GiosanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q William D. Orsi Marco J. L. Coolen Cornelia Wuchter Lijun He Kuldeep D. More Xabier Irigoien Guillem Chust Carl Johnson Jordon D. Hemingway Mitchell Lee Valier Galy Liviu Giosan Climate oscillations reflected within the microbiome of Arabian Sea sediments
description	Abstract Selection of microorganisms in marine sediment is shaped by energy-yielding electron acceptors for respiration that are depleted in vertical succession. However, some taxa have been reported to reflect past depositional conditions suggesting they have experienced weak selection after burial. In sediments underlying the Arabian Sea oxygen minimum zone (OMZ), we performed the first metagenomic profiling of sedimentary DNA at centennial-scale resolution in the context of a multi-proxy paleoclimate reconstruction. While vertical distributions of sulfate reducing bacteria and methanogens indicate energy-based selection typical of anoxic marine sediments, 5–15% of taxa per sample exhibit depth-independent stratigraphies indicative of paleoenvironmental selection over relatively short geological timescales. Despite being vertically separated, indicator taxa deposited under OMZ conditions were more similar to one another than those deposited in bioturbated intervals under intervening higher oxygen. The genomic potential for denitrification also correlated with palaeo-OMZ proxies, independent of sediment depth and available nitrate and nitrite. However, metagenomes revealed mixed acid and Entner-Dourdoroff fermentation pathways encoded by many of the same denitrifier groups. Fermentation thus may explain the subsistence of these facultatively anaerobic microbes whose stratigraphy follows changing paleoceanographic conditions. At least for certain taxa, our analysis provides evidence of their paleoenvironmental selection over the last glacial-interglacial cycle.
format	article
author	William D. Orsi Marco J. L. Coolen Cornelia Wuchter Lijun He Kuldeep D. More Xabier Irigoien Guillem Chust Carl Johnson Jordon D. Hemingway Mitchell Lee Valier Galy Liviu Giosan
author_facet	William D. Orsi Marco J. L. Coolen Cornelia Wuchter Lijun He Kuldeep D. More Xabier Irigoien Guillem Chust Carl Johnson Jordon D. Hemingway Mitchell Lee Valier Galy Liviu Giosan
author_sort	William D. Orsi
title	Climate oscillations reflected within the microbiome of Arabian Sea sediments
title_short	Climate oscillations reflected within the microbiome of Arabian Sea sediments
title_full	Climate oscillations reflected within the microbiome of Arabian Sea sediments
title_fullStr	Climate oscillations reflected within the microbiome of Arabian Sea sediments
title_full_unstemmed	Climate oscillations reflected within the microbiome of Arabian Sea sediments
title_sort	climate oscillations reflected within the microbiome of arabian sea sediments
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/3bc74f0f1e6e4bb9a8ac21a3fe65b03b
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Climate oscillations reflected within the microbiome of Arabian Sea sediments

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