Microbe biogeography tracks water masses in a dynamic oceanic frontal system

Dispersal limitation, not just environmental selection, plays an important role in microbial biogeography. The distance–decay relationship is thought to be weak in habitats where dispersal is high, such as in the pelagic environment, where ocean currents facilitate microbial dispersal. Most studies...

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Published in:Royal Society Open Science
Main Authors: Djurhuus, Anni, Boersch-Supan, Philipp H., Mikalsen, Svein-Ole, Rogers, Alex D.
Format: Text
Language:English
Published: The Royal Society Publishing 2017
Subjects:
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5383857/
https://doi.org/10.1098/rsos.170033
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spelling ftpubmed:oai:pubmedcentral.nih.gov:5383857 2023-05-15T13:54:57+02:00 Microbe biogeography tracks water masses in a dynamic oceanic frontal system Djurhuus, Anni Boersch-Supan, Philipp H. Mikalsen, Svein-Ole Rogers, Alex D. 2017-03-15 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5383857/ https://doi.org/10.1098/rsos.170033 en eng The Royal Society Publishing http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5383857/ http://dx.doi.org/10.1098/rsos.170033 © 2017 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. CC-BY Biology (Whole Organism) Text 2017 ftpubmed https://doi.org/10.1098/rsos.170033 2017-04-16T00:12:44Z Dispersal limitation, not just environmental selection, plays an important role in microbial biogeography. The distance–decay relationship is thought to be weak in habitats where dispersal is high, such as in the pelagic environment, where ocean currents facilitate microbial dispersal. Most studies of microbial community composition to date have observed little geographical heterogeneity on a regional scale (100 km). We present a study of microbial communities across a dynamic frontal zone in the southwest Indian Ocean and investigate the spatial structure of the microbes with respect to the different water masses separated by these fronts. We collected 153 samples of free-living microorganisms from five seamounts located along a gradient from subtropical to subantarctic waters and across three depth layers: (i) the sub-surface chlorophyll maximum (approx. 40 m), (ii) the bottom of the euphotic zone (approx. 200 m), and (iii) the benthic boundary layer (300–2000 m). Diversity and abundance of microbial operational taxonomic units (OTUs) were assessed by amplification and sequencing of the 16S rRNA gene on an Illumina MiSeq platform. Multivariate analyses showed that microbial communities were structured more strongly by depth than by latitude, with similar phyla occurring within each depth stratum across seamounts. The deep layer was homogeneous across the entire survey area, corresponding to the spread of Antarctic intermediate water. However, within both the sub-surface layer and the intermediate depth stratum there was evidence for OTU turnover across fronts. The microbiome of these layers appears to be divided into three distinct biological regimes corresponding to the subantarctic surface water, the convergence zone and subtropical. We show that microbial biogeography across depth and latitudinal gradients is linked to the water masses the microbes persist in, resulting in regional patterns of microbial biogeography that correspond to the regional scale physical oceanography. Text Antarc* Antarctic PubMed Central (PMC) Antarctic Indian Royal Society Open Science 4 3 170033
institution Open Polar
collection PubMed Central (PMC)
op_collection_id ftpubmed
language English
topic Biology (Whole Organism)
spellingShingle Biology (Whole Organism)
Djurhuus, Anni
Boersch-Supan, Philipp H.
Mikalsen, Svein-Ole
Rogers, Alex D.
Microbe biogeography tracks water masses in a dynamic oceanic frontal system
topic_facet Biology (Whole Organism)
description Dispersal limitation, not just environmental selection, plays an important role in microbial biogeography. The distance–decay relationship is thought to be weak in habitats where dispersal is high, such as in the pelagic environment, where ocean currents facilitate microbial dispersal. Most studies of microbial community composition to date have observed little geographical heterogeneity on a regional scale (100 km). We present a study of microbial communities across a dynamic frontal zone in the southwest Indian Ocean and investigate the spatial structure of the microbes with respect to the different water masses separated by these fronts. We collected 153 samples of free-living microorganisms from five seamounts located along a gradient from subtropical to subantarctic waters and across three depth layers: (i) the sub-surface chlorophyll maximum (approx. 40 m), (ii) the bottom of the euphotic zone (approx. 200 m), and (iii) the benthic boundary layer (300–2000 m). Diversity and abundance of microbial operational taxonomic units (OTUs) were assessed by amplification and sequencing of the 16S rRNA gene on an Illumina MiSeq platform. Multivariate analyses showed that microbial communities were structured more strongly by depth than by latitude, with similar phyla occurring within each depth stratum across seamounts. The deep layer was homogeneous across the entire survey area, corresponding to the spread of Antarctic intermediate water. However, within both the sub-surface layer and the intermediate depth stratum there was evidence for OTU turnover across fronts. The microbiome of these layers appears to be divided into three distinct biological regimes corresponding to the subantarctic surface water, the convergence zone and subtropical. We show that microbial biogeography across depth and latitudinal gradients is linked to the water masses the microbes persist in, resulting in regional patterns of microbial biogeography that correspond to the regional scale physical oceanography.
format Text
author Djurhuus, Anni
Boersch-Supan, Philipp H.
Mikalsen, Svein-Ole
Rogers, Alex D.
author_facet Djurhuus, Anni
Boersch-Supan, Philipp H.
Mikalsen, Svein-Ole
Rogers, Alex D.
author_sort Djurhuus, Anni
title Microbe biogeography tracks water masses in a dynamic oceanic frontal system
title_short Microbe biogeography tracks water masses in a dynamic oceanic frontal system
title_full Microbe biogeography tracks water masses in a dynamic oceanic frontal system
title_fullStr Microbe biogeography tracks water masses in a dynamic oceanic frontal system
title_full_unstemmed Microbe biogeography tracks water masses in a dynamic oceanic frontal system
title_sort microbe biogeography tracks water masses in a dynamic oceanic frontal system
publisher The Royal Society Publishing
publishDate 2017
url http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5383857/
https://doi.org/10.1098/rsos.170033
geographic Antarctic
Indian
geographic_facet Antarctic
Indian
genre Antarc*
Antarctic
genre_facet Antarc*
Antarctic
op_relation http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5383857/
http://dx.doi.org/10.1098/rsos.170033
op_rights © 2017 The Authors.
http://creativecommons.org/licenses/by/4.0/
Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
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