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Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System

Saharan dust input and seasonal upwelling along North–West Africa provide a model system for studying microbial processes related to the export and recycling of nutrients. This study offers the first molecular characterization of prokaryotic particle-attached (PA; >3.0 μm) and free-living (FL; 0....

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Autores principales: Bachmann, Jennifer, Heimbach, Tabea, Hassenrück, Christiane, Kopprio, Germán A., Iversen, Morten Hvitfeldt, Grossart, Hans Peter, Gärdes, Astrid
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265507/
https://www.ncbi.nlm.nih.gov/pubmed/30532746
http://dx.doi.org/10.3389/fmicb.2018.02836
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author Bachmann, Jennifer
Heimbach, Tabea
Hassenrück, Christiane
Kopprio, Germán A.
Iversen, Morten Hvitfeldt
Grossart, Hans Peter
Gärdes, Astrid
author_facet Bachmann, Jennifer
Heimbach, Tabea
Hassenrück, Christiane
Kopprio, Germán A.
Iversen, Morten Hvitfeldt
Grossart, Hans Peter
Gärdes, Astrid
author_sort Bachmann, Jennifer
collection PubMed
description Saharan dust input and seasonal upwelling along North–West Africa provide a model system for studying microbial processes related to the export and recycling of nutrients. This study offers the first molecular characterization of prokaryotic particle-attached (PA; >3.0 μm) and free-living (FL; 0.2–3.0 μm) players in this important ecosystem during August 2016. Environmental drivers for alpha-diversity, bacterial community composition, and differences between FL and PA fractions were identified. The ultra-oligotrophic waters off Senegal were dominated by Cyanobacteria while higher relative abundances of Alphaproteobacteria, Bacteroidetes, Verrucomicrobia, and Planctomycetes (known particle-degraders) occurred in the upwelling area. Temperature, proxy for different water masses, was the best predictor for changes in FL communities. PA community variation was best explained by temperature and ammonium. Bray Curtis dissimilarities between FL and PA were generally very high and correlated with temperature and salinity in surface waters. Greatest similarities between FL and PA occurred at the deep chlorophyll maximum, where bacterial substrate availability was likely highest. This indicates that environmental drivers do not only influence changes among FL and PA communities but also differences between them. This could provide an explanation for contradicting results obtained by different studies regarding the dissimilarity/similarity between FL and PA communities and their biogeochemical functions.
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spelling pubmed-62655072018-12-07 Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System Bachmann, Jennifer Heimbach, Tabea Hassenrück, Christiane Kopprio, Germán A. Iversen, Morten Hvitfeldt Grossart, Hans Peter Gärdes, Astrid Front Microbiol Microbiology Saharan dust input and seasonal upwelling along North–West Africa provide a model system for studying microbial processes related to the export and recycling of nutrients. This study offers the first molecular characterization of prokaryotic particle-attached (PA; >3.0 μm) and free-living (FL; 0.2–3.0 μm) players in this important ecosystem during August 2016. Environmental drivers for alpha-diversity, bacterial community composition, and differences between FL and PA fractions were identified. The ultra-oligotrophic waters off Senegal were dominated by Cyanobacteria while higher relative abundances of Alphaproteobacteria, Bacteroidetes, Verrucomicrobia, and Planctomycetes (known particle-degraders) occurred in the upwelling area. Temperature, proxy for different water masses, was the best predictor for changes in FL communities. PA community variation was best explained by temperature and ammonium. Bray Curtis dissimilarities between FL and PA were generally very high and correlated with temperature and salinity in surface waters. Greatest similarities between FL and PA occurred at the deep chlorophyll maximum, where bacterial substrate availability was likely highest. This indicates that environmental drivers do not only influence changes among FL and PA communities but also differences between them. This could provide an explanation for contradicting results obtained by different studies regarding the dissimilarity/similarity between FL and PA communities and their biogeochemical functions. Frontiers Media S.A. 2018-11-23 /pmc/articles/PMC6265507/ /pubmed/30532746 http://dx.doi.org/10.3389/fmicb.2018.02836 Text en Copyright © 2018 Bachmann, Heimbach, Hassenrück, Kopprio, Iversen, Grossart and Gärdes. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Microbiology
Bachmann, Jennifer
Heimbach, Tabea
Hassenrück, Christiane
Kopprio, Germán A.
Iversen, Morten Hvitfeldt
Grossart, Hans Peter
Gärdes, Astrid
Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System
title Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System
title_full Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System
title_fullStr Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System
title_full_unstemmed Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System
title_short Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System
title_sort environmental drivers of free-living vs. particle-attached bacterial community composition in the mauritania upwelling system
topic Microbiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265507/
https://www.ncbi.nlm.nih.gov/pubmed/30532746
http://dx.doi.org/10.3389/fmicb.2018.02836
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