Significant Impacts of Increasing Aridity on the Arid Soil Microbiome

ABSTRACT Global deserts occupy one-third of the Earth’s surface and contribute significantly to organic carbon storage, a process at risk in dryland ecosystems that are highly vulnerable to climate-driven ecosystem degradation. The forces controlling desert ecosystem degradation rates are poorly und...

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Autores principales:	Julia W. Neilson, Katy Califf, Cesar Cardona, Audrey Copeland, Will van Treuren, Karen L. Josephson, Rob Knight, Jack A. Gilbert, Jay Quade, J. Gregory Caporaso, Raina M. Maier
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2017
Materias:	arid soil microbiome climate change desert desertification microbial diversity Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/d315113a58b149e79ea0b3f5debed444
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spelling	oai:doaj.org-article:d315113a58b149e79ea0b3f5debed4442021-12-02T19:45:29ZSignificant Impacts of Increasing Aridity on the Arid Soil Microbiome10.1128/mSystems.00195-162379-5077https://doaj.org/article/d315113a58b149e79ea0b3f5debed4442017-06-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSystems.00195-16https://doaj.org/toc/2379-5077ABSTRACT Global deserts occupy one-third of the Earth’s surface and contribute significantly to organic carbon storage, a process at risk in dryland ecosystems that are highly vulnerable to climate-driven ecosystem degradation. The forces controlling desert ecosystem degradation rates are poorly understood, particularly with respect to the relevance of the arid-soil microbiome. Here we document correlations between increasing aridity and soil bacterial and archaeal microbiome composition along arid to hyperarid transects traversing the Atacama Desert, Chile. A meta-analysis reveals that Atacama soil microbiomes exhibit a gradient in composition, are distinct from a broad cross-section of nondesert soils, and yet are similar to three deserts from different continents. Community richness and diversity were significantly positively correlated with soil relative humidity (SoilRH). Phylogenetic composition was strongly correlated with SoilRH, temperature, and electrical conductivity. The strongest and most significant correlations between SoilRH and phylum relative abundance were observed for Acidobacteria, Proteobacteria, Planctomycetes, Verrucomicrobia, and Euryarchaeota (Spearman’s rank correlation [rs] = >0.81; false-discovery rate [q] = ≤0.005), characterized by 10- to 300-fold decreases in the relative abundance of each taxon. In addition, network analysis revealed a deterioration in the density of significant associations between taxa along the arid to hyperarid gradient, a pattern that may compromise the resilience of hyperarid communities because they lack properties associated with communities that are more integrated. In summary, results suggest that arid-soil microbiome stability is sensitive to aridity as demonstrated by decreased community connectivity associated with the transition from the arid class to the hyperarid class and the significant correlations observed between soilRH and both diversity and the relative abundances of key microbial phyla typically dominant in global soils. IMPORTANCE We identify key environmental and geochemical factors that shape the arid soil microbiome along aridity and vegetation gradients spanning over 300 km of the Atacama Desert, Chile. Decreasing average soil relative humidity and increasing temperature explain significant reductions in the diversity and connectivity of these desert soil microbial communities and lead to significant reductions in the abundance of key taxa typically associated with fertile soils. This finding is important because it suggests that predicted climate change-driven increases in aridity may compromise the capacity of the arid-soil microbiome to sustain necessary nutrient cycling and carbon sequestration functions as well as vegetative cover in desert ecosystems, which comprise one-third of the terrestrial biomes on Earth.Julia W. NeilsonKaty CaliffCesar CardonaAudrey CopelandWill van TreurenKaren L. JosephsonRob KnightJack A. GilbertJay QuadeJ. Gregory CaporasoRaina M. MaierAmerican Society for Microbiologyarticlearid soil microbiomeclimate changedesertdesertificationmicrobial diversityMicrobiologyQR1-502ENmSystems, Vol 2, Iss 3 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	arid soil microbiome climate change desert desertification microbial diversity Microbiology QR1-502
spellingShingle	arid soil microbiome climate change desert desertification microbial diversity Microbiology QR1-502 Julia W. Neilson Katy Califf Cesar Cardona Audrey Copeland Will van Treuren Karen L. Josephson Rob Knight Jack A. Gilbert Jay Quade J. Gregory Caporaso Raina M. Maier Significant Impacts of Increasing Aridity on the Arid Soil Microbiome
description	ABSTRACT Global deserts occupy one-third of the Earth’s surface and contribute significantly to organic carbon storage, a process at risk in dryland ecosystems that are highly vulnerable to climate-driven ecosystem degradation. The forces controlling desert ecosystem degradation rates are poorly understood, particularly with respect to the relevance of the arid-soil microbiome. Here we document correlations between increasing aridity and soil bacterial and archaeal microbiome composition along arid to hyperarid transects traversing the Atacama Desert, Chile. A meta-analysis reveals that Atacama soil microbiomes exhibit a gradient in composition, are distinct from a broad cross-section of nondesert soils, and yet are similar to three deserts from different continents. Community richness and diversity were significantly positively correlated with soil relative humidity (SoilRH). Phylogenetic composition was strongly correlated with SoilRH, temperature, and electrical conductivity. The strongest and most significant correlations between SoilRH and phylum relative abundance were observed for Acidobacteria, Proteobacteria, Planctomycetes, Verrucomicrobia, and Euryarchaeota (Spearman’s rank correlation [rs] = >0.81; false-discovery rate [q] = ≤0.005), characterized by 10- to 300-fold decreases in the relative abundance of each taxon. In addition, network analysis revealed a deterioration in the density of significant associations between taxa along the arid to hyperarid gradient, a pattern that may compromise the resilience of hyperarid communities because they lack properties associated with communities that are more integrated. In summary, results suggest that arid-soil microbiome stability is sensitive to aridity as demonstrated by decreased community connectivity associated with the transition from the arid class to the hyperarid class and the significant correlations observed between soilRH and both diversity and the relative abundances of key microbial phyla typically dominant in global soils. IMPORTANCE We identify key environmental and geochemical factors that shape the arid soil microbiome along aridity and vegetation gradients spanning over 300 km of the Atacama Desert, Chile. Decreasing average soil relative humidity and increasing temperature explain significant reductions in the diversity and connectivity of these desert soil microbial communities and lead to significant reductions in the abundance of key taxa typically associated with fertile soils. This finding is important because it suggests that predicted climate change-driven increases in aridity may compromise the capacity of the arid-soil microbiome to sustain necessary nutrient cycling and carbon sequestration functions as well as vegetative cover in desert ecosystems, which comprise one-third of the terrestrial biomes on Earth.
format	article
author	Julia W. Neilson Katy Califf Cesar Cardona Audrey Copeland Will van Treuren Karen L. Josephson Rob Knight Jack A. Gilbert Jay Quade J. Gregory Caporaso Raina M. Maier
author_facet	Julia W. Neilson Katy Califf Cesar Cardona Audrey Copeland Will van Treuren Karen L. Josephson Rob Knight Jack A. Gilbert Jay Quade J. Gregory Caporaso Raina M. Maier
author_sort	Julia W. Neilson
title	Significant Impacts of Increasing Aridity on the Arid Soil Microbiome
title_short	Significant Impacts of Increasing Aridity on the Arid Soil Microbiome
title_full	Significant Impacts of Increasing Aridity on the Arid Soil Microbiome
title_fullStr	Significant Impacts of Increasing Aridity on the Arid Soil Microbiome
title_full_unstemmed	Significant Impacts of Increasing Aridity on the Arid Soil Microbiome
title_sort	significant impacts of increasing aridity on the arid soil microbiome
publisher	American Society for Microbiology
publishDate	2017
url	https://doaj.org/article/d315113a58b149e79ea0b3f5debed444
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Significant Impacts of Increasing Aridity on the Arid Soil Microbiome

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