Soil Microbial Responses to Increased Moisture and Organic Resources along a Salinity Gradient in a Polar Desert
ABSTRACT Microbial communities in extreme environments often have low diversity and specialized physiologies suggesting a limited resistance to change. The McMurdo Dry Valleys (MDV) are a microbially dominated, extreme ecosystem currently undergoing climate change-induced disturbances, including the...
Published in: | Applied and Environmental Microbiology |
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American Society for Microbiology
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Online Access: | http://dx.doi.org/10.1128/aem.03414-13 https://journals.asm.org/doi/pdf/10.1128/AEM.03414-13 |
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crasmicro:10.1128/aem.03414-13 2024-06-23T07:53:40+00:00 Soil Microbial Responses to Increased Moisture and Organic Resources along a Salinity Gradient in a Polar Desert Van Horn, David J. Okie, Jordan G. Buelow, Heather N. Gooseff, Michael N. Barrett, John E. Takacs-Vesbach, Cristina D. Kostka, J. E. 2014 http://dx.doi.org/10.1128/aem.03414-13 https://journals.asm.org/doi/pdf/10.1128/AEM.03414-13 en eng American Society for Microbiology https://journals.asm.org/non-commercial-tdm-license Applied and Environmental Microbiology volume 80, issue 10, page 3034-3043 ISSN 0099-2240 1098-5336 journal-article 2014 crasmicro https://doi.org/10.1128/aem.03414-13 2024-06-10T04:07:04Z ABSTRACT Microbial communities in extreme environments often have low diversity and specialized physiologies suggesting a limited resistance to change. The McMurdo Dry Valleys (MDV) are a microbially dominated, extreme ecosystem currently undergoing climate change-induced disturbances, including the melting of massive buried ice, cutting through of permafrost by streams, and warming events. These processes are increasing moisture across the landscape, altering conditions for soil communities by mobilizing nutrients and salts and stimulating autotrophic carbon inputs to soils. The goal of this study was to determine the effects of resource addition (water/organic matter) on the composition and function of microbial communities in the MDV along a natural salinity gradient representing an additional gradient of stress in an already extreme environment. Soil respiration and the activity of carbon-acquiring extracellular enzymes increased significantly ( P < 0.05) with the addition of resources at the low- and moderate-salinity sites but not the high-salinity site. The bacterial community composition was altered, with an increase in Proteobacteria and Firmicutes with water and organic matter additions at the low- and moderate-salinity sites and a near dominance of Firmicutes at the high-salinity site. Principal coordinate analyses of all samples using a phylogenetically informed distance matrix (UniFrac) demonstrated discrete clustering among sites (analysis of similarity [ANOSIM], P < 0.05 and R > 0.40) and among most treatments within sites. The results from this experimental work suggest that microbial communities in this environment will undergo rapid change in response to the altered resources resulting from climate change impacts occurring in this region. Article in Journal/Newspaper Ice McMurdo Dry Valleys permafrost polar desert ASM Journals (American Society for Microbiology) McMurdo Dry Valleys Applied and Environmental Microbiology 80 10 3034 3043 |
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Open Polar |
collection |
ASM Journals (American Society for Microbiology) |
op_collection_id |
crasmicro |
language |
English |
description |
ABSTRACT Microbial communities in extreme environments often have low diversity and specialized physiologies suggesting a limited resistance to change. The McMurdo Dry Valleys (MDV) are a microbially dominated, extreme ecosystem currently undergoing climate change-induced disturbances, including the melting of massive buried ice, cutting through of permafrost by streams, and warming events. These processes are increasing moisture across the landscape, altering conditions for soil communities by mobilizing nutrients and salts and stimulating autotrophic carbon inputs to soils. The goal of this study was to determine the effects of resource addition (water/organic matter) on the composition and function of microbial communities in the MDV along a natural salinity gradient representing an additional gradient of stress in an already extreme environment. Soil respiration and the activity of carbon-acquiring extracellular enzymes increased significantly ( P < 0.05) with the addition of resources at the low- and moderate-salinity sites but not the high-salinity site. The bacterial community composition was altered, with an increase in Proteobacteria and Firmicutes with water and organic matter additions at the low- and moderate-salinity sites and a near dominance of Firmicutes at the high-salinity site. Principal coordinate analyses of all samples using a phylogenetically informed distance matrix (UniFrac) demonstrated discrete clustering among sites (analysis of similarity [ANOSIM], P < 0.05 and R > 0.40) and among most treatments within sites. The results from this experimental work suggest that microbial communities in this environment will undergo rapid change in response to the altered resources resulting from climate change impacts occurring in this region. |
author2 |
Kostka, J. E. |
format |
Article in Journal/Newspaper |
author |
Van Horn, David J. Okie, Jordan G. Buelow, Heather N. Gooseff, Michael N. Barrett, John E. Takacs-Vesbach, Cristina D. |
spellingShingle |
Van Horn, David J. Okie, Jordan G. Buelow, Heather N. Gooseff, Michael N. Barrett, John E. Takacs-Vesbach, Cristina D. Soil Microbial Responses to Increased Moisture and Organic Resources along a Salinity Gradient in a Polar Desert |
author_facet |
Van Horn, David J. Okie, Jordan G. Buelow, Heather N. Gooseff, Michael N. Barrett, John E. Takacs-Vesbach, Cristina D. |
author_sort |
Van Horn, David J. |
title |
Soil Microbial Responses to Increased Moisture and Organic Resources along a Salinity Gradient in a Polar Desert |
title_short |
Soil Microbial Responses to Increased Moisture and Organic Resources along a Salinity Gradient in a Polar Desert |
title_full |
Soil Microbial Responses to Increased Moisture and Organic Resources along a Salinity Gradient in a Polar Desert |
title_fullStr |
Soil Microbial Responses to Increased Moisture and Organic Resources along a Salinity Gradient in a Polar Desert |
title_full_unstemmed |
Soil Microbial Responses to Increased Moisture and Organic Resources along a Salinity Gradient in a Polar Desert |
title_sort |
soil microbial responses to increased moisture and organic resources along a salinity gradient in a polar desert |
publisher |
American Society for Microbiology |
publishDate |
2014 |
url |
http://dx.doi.org/10.1128/aem.03414-13 https://journals.asm.org/doi/pdf/10.1128/AEM.03414-13 |
geographic |
McMurdo Dry Valleys |
geographic_facet |
McMurdo Dry Valleys |
genre |
Ice McMurdo Dry Valleys permafrost polar desert |
genre_facet |
Ice McMurdo Dry Valleys permafrost polar desert |
op_source |
Applied and Environmental Microbiology volume 80, issue 10, page 3034-3043 ISSN 0099-2240 1098-5336 |
op_rights |
https://journals.asm.org/non-commercial-tdm-license |
op_doi |
https://doi.org/10.1128/aem.03414-13 |
container_title |
Applied and Environmental Microbiology |
container_volume |
80 |
container_issue |
10 |
container_start_page |
3034 |
op_container_end_page |
3043 |
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1802645428516159488 |