Distinct Community Assembly Processes of Abundant and Rare Soil Bacteria in Coastal Wetlands along an Inundation Gradient

ABSTRACT Microbial communities commonly consist of a large number of rare taxa (RT) and few abundant taxa (AT), and it is important to identify the differences of the community assembly processes between RT and AT in response to environmental changes. However, the community assembly processes govern...

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Autores principales:	Gui-Feng Gao, Dan Peng, Binu M. Tripathi, Yihui Zhang, Haiyan Chu
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2020
Materias:	rare bacteria abundant bacteria assembly processes plant biomass coastal wetlands Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/f9be0e6a3b4b4c24bac3e36fe421bbba
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spelling	oai:doaj.org-article:f9be0e6a3b4b4c24bac3e36fe421bbba2021-12-02T18:44:44ZDistinct Community Assembly Processes of Abundant and Rare Soil Bacteria in Coastal Wetlands along an Inundation Gradient10.1128/mSystems.01150-202379-5077https://doaj.org/article/f9be0e6a3b4b4c24bac3e36fe421bbba2020-12-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSystems.01150-20https://doaj.org/toc/2379-5077ABSTRACT Microbial communities commonly consist of a large number of rare taxa (RT) and few abundant taxa (AT), and it is important to identify the differences of the community assembly processes between RT and AT in response to environmental changes. However, the community assembly processes governing AT and RT in coastal wetland soils along an inundation gradient remain elusive. Here, an in situ mesocosm, with continuous inundation gradients and native mangrove Kandelia obovata or exotic cordgrass Spartina alterniflora, was established to determine the patterns and driving factors of community turnover and assembly processes of AT and RT. We found that RT exhibited a remarkably lower turnover rate than AT, and the niche breadth of RT was significantly narrower than that of AT. In comparison with AT, RT presented stronger phylogenetic signals for ecological preferences across environmental gradients. Null model analyses revealed that RT were more phylogenetically clustered and primarily governed by homogeneous selection, while AT were more overdispersed and dominated by dispersal limitation. Soil water content was the most decisive factor for community turnover and assembly processes of both AT and RT. Structural equation modeling analysis showed that RT were strongly associated with K. obovata biomass rather than S. alterniflora biomass, suggesting a strong relationship between RT and the growth of mangrove K. obovata. Overall, our study revealed distinct assembly processes of soil AT and RT communities in coastal wetlands, which is crucial for mechanistic understanding of the establishment and maintenance of soil microbial diversity in coastal wetlands under conditions of global environmental changes. IMPORTANCE Coastal wetlands are one of the important ecosystems that play a crucial role in the regulation of climate change. Rare taxa (RT) exist in one habitat along with abundant taxa (AT). In this study, we found that RT exhibited narrower niche breadth and stronger phylogenetic signals than AT. Null model analyses showed that RT were more phylogenetically clustered and primarily governed by homogeneous selection, while AT were more overdispersed and dominated by dispersal limitation. Revealing the differences in the community assembly processes between AT and RT in coastal wetlands is critical to understand the establishment and maintenance of soil microbial diversity in coastal wetlands with regard to environmental changes.Gui-Feng GaoDan PengBinu M. TripathiYihui ZhangHaiyan ChuAmerican Society for Microbiologyarticlerare bacteriaabundant bacteriaassembly processesplant biomasscoastal wetlandsMicrobiologyQR1-502ENmSystems, Vol 5, Iss 6 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	rare bacteria abundant bacteria assembly processes plant biomass coastal wetlands Microbiology QR1-502
spellingShingle	rare bacteria abundant bacteria assembly processes plant biomass coastal wetlands Microbiology QR1-502 Gui-Feng Gao Dan Peng Binu M. Tripathi Yihui Zhang Haiyan Chu Distinct Community Assembly Processes of Abundant and Rare Soil Bacteria in Coastal Wetlands along an Inundation Gradient
description	ABSTRACT Microbial communities commonly consist of a large number of rare taxa (RT) and few abundant taxa (AT), and it is important to identify the differences of the community assembly processes between RT and AT in response to environmental changes. However, the community assembly processes governing AT and RT in coastal wetland soils along an inundation gradient remain elusive. Here, an in situ mesocosm, with continuous inundation gradients and native mangrove Kandelia obovata or exotic cordgrass Spartina alterniflora, was established to determine the patterns and driving factors of community turnover and assembly processes of AT and RT. We found that RT exhibited a remarkably lower turnover rate than AT, and the niche breadth of RT was significantly narrower than that of AT. In comparison with AT, RT presented stronger phylogenetic signals for ecological preferences across environmental gradients. Null model analyses revealed that RT were more phylogenetically clustered and primarily governed by homogeneous selection, while AT were more overdispersed and dominated by dispersal limitation. Soil water content was the most decisive factor for community turnover and assembly processes of both AT and RT. Structural equation modeling analysis showed that RT were strongly associated with K. obovata biomass rather than S. alterniflora biomass, suggesting a strong relationship between RT and the growth of mangrove K. obovata. Overall, our study revealed distinct assembly processes of soil AT and RT communities in coastal wetlands, which is crucial for mechanistic understanding of the establishment and maintenance of soil microbial diversity in coastal wetlands under conditions of global environmental changes. IMPORTANCE Coastal wetlands are one of the important ecosystems that play a crucial role in the regulation of climate change. Rare taxa (RT) exist in one habitat along with abundant taxa (AT). In this study, we found that RT exhibited narrower niche breadth and stronger phylogenetic signals than AT. Null model analyses showed that RT were more phylogenetically clustered and primarily governed by homogeneous selection, while AT were more overdispersed and dominated by dispersal limitation. Revealing the differences in the community assembly processes between AT and RT in coastal wetlands is critical to understand the establishment and maintenance of soil microbial diversity in coastal wetlands with regard to environmental changes.
format	article
author	Gui-Feng Gao Dan Peng Binu M. Tripathi Yihui Zhang Haiyan Chu
author_facet	Gui-Feng Gao Dan Peng Binu M. Tripathi Yihui Zhang Haiyan Chu
author_sort	Gui-Feng Gao
title	Distinct Community Assembly Processes of Abundant and Rare Soil Bacteria in Coastal Wetlands along an Inundation Gradient
title_short	Distinct Community Assembly Processes of Abundant and Rare Soil Bacteria in Coastal Wetlands along an Inundation Gradient
title_full	Distinct Community Assembly Processes of Abundant and Rare Soil Bacteria in Coastal Wetlands along an Inundation Gradient
title_fullStr	Distinct Community Assembly Processes of Abundant and Rare Soil Bacteria in Coastal Wetlands along an Inundation Gradient
title_full_unstemmed	Distinct Community Assembly Processes of Abundant and Rare Soil Bacteria in Coastal Wetlands along an Inundation Gradient
title_sort	distinct community assembly processes of abundant and rare soil bacteria in coastal wetlands along an inundation gradient
publisher	American Society for Microbiology
publishDate	2020
url	https://doaj.org/article/f9be0e6a3b4b4c24bac3e36fe421bbba
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Distinct Community Assembly Processes of Abundant and Rare Soil Bacteria in Coastal Wetlands along an Inundation Gradient

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