The ecological assembly of bacterial communities in Antarctic wetlands varies across levels of phylogenetic resolution

14 páginas, 6 figuras As functional traits are conserved at different phylogenetic depths, the ability to detect community assembly processes can be conditional on the phylogenetic resolution; yet most previous work quantifying their influence has focused on a single level of phylogenetic resolution...

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Bibliographic Details
Published in:Environmental Microbiology
Main Authors: Quiroga, María Victoria, Valverde Portal, Ángel, Mataloni, Gabriela, Casa, Valeria, Stegen, James C., Cowan, Don A.
Other Authors: National Research Foundation (South Africa), Agencia Nacional de Promoción Científica y Tecnológica (Argentina), Junta de Castilla y León
Format: Article in Journal/Newspaper
Language:English
Published: John Wiley & Sons 2022
Subjects:
Antarctic Regions
Bacteria
Ecosystem
Phylogeny
Wetlands
Antarctic
Argentina
Argentino
Ramos
Southern Ocean
Antarc*
Instituto Antártico Argentino
Online Access:http://hdl.handle.net/10261/279858
https://doi.org/10.1111/1462-2920.15912
https://doi.org/10.13039/501100014180
https://doi.org/10.13039/501100003074
https://doi.org/10.13039/501100001321
https://api.elsevier.com/content/abstract/scopus_id/85123820989
Description
Summary:14 páginas, 6 figuras As functional traits are conserved at different phylogenetic depths, the ability to detect community assembly processes can be conditional on the phylogenetic resolution; yet most previous work quantifying their influence has focused on a single level of phylogenetic resolution. Here, we have studied the ecological assembly of bacterial communities from an Antarctic wetland complex, applying null models across different levels of phylogenetic resolution (i.e. clustering ASVs into OTUs with decreasing sequence identity thresholds). We found that the relative influence of the community assembly processes varies with phylogenetic resolution. More specifically, selection processes seem to impose stronger influence at finer (100% sequence similarity ASV) than at coarser (99%-97% sequence similarity OTUs) resolution. We identified environmental features related with the ecological processes and propose a conceptual model for the bacterial community assembly in this Antarctic ecosystem. Briefly, eco-evolutionary processes appear to be leading to different but very closely related ASVs in lotic, lentic and terrestrial environments. In all, this study shows that assessing community assembly processes at different phylogenetic resolutions is key to improve our understanding of microbial ecology. More importantly, a failure to detect selection processes at coarser phylogenetic resolution does not imply the absence of such processes at finer resolutions. This research contributes to the Ant-ICON (Integrated Science to Inform Antarctic and Southern Ocean Conservation) SCAR Scientific Research Programme and was jointly supported by ANPCyT–Argentina (grants PICT 2016-2517,2016-1554) and NRF–South Africa. We thank two anonymous reviewers for their valuable comments on the manuscript. We thank for their help to P. H. Lebre, S. Metz,Y. Sica, P. Fermani, D. González, S. Ramos Marín,M. Libertelli, the crew of Base Primavera and the Instituto Antártico Argentino–Dirección Nacional del Antártico.A.V. was ...

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