Changes in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords

Abstract Fjords are semi-enclosed marine systems with unique physical conditions that influence microbial community composition and structure. Pronounced organic matter and physical condition gradients within fjords provide a natural laboratory for the study of changes in microbial community structu...

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Main Authors:	Sven P. Tobias-Hünefeldt, Stephen R. Wing, Federico Baltar, Sergio E. Morales
Format:	article
Language:	EN
Published:	Nature Portfolio 2021
Subjects:	Medicine R Science Q
Online Access:	https://doaj.org/article/28bb44daa80d4a97a62393c7419f4c6c
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spelling	oai:doaj.org-article:28bb44daa80d4a97a62393c7419f4c6c2021-12-02T18:51:29ZChanges in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords10.1038/s41598-021-98519-22045-2322https://doaj.org/article/28bb44daa80d4a97a62393c7419f4c6c2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98519-2https://doaj.org/toc/2045-2322Abstract Fjords are semi-enclosed marine systems with unique physical conditions that influence microbial community composition and structure. Pronounced organic matter and physical condition gradients within fjords provide a natural laboratory for the study of changes in microbial community structure and metabolic potential in response to environmental conditions. Photosynthetic production in euphotic zones sustains deeper aphotic microbial activity via organic matter sinking, augmented by large terrestrial inputs. Previous studies do not consider both prokaryotic and eukaryotic communities when linking metabolic potential and activity, community composition, and environmental gradients. To address this gap we profiled microbial functional potential (Biolog Ecoplates), bacterial abundance, heterotrophic production (3H-Leucine incorporation), and prokaryotic/eukaryotic community composition (16S and 18S rRNA amplicon gene sequencing). Similar factors shaped metabolic potential, activity and community (prokaryotic and eukaryotic) composition across surface/near surface sites. However, increased metabolic diversity at near bottom (aphotic) sites reflected an organic matter influence from sediments. Photosynthetically produced particulate organic matter shaped the upper water column community composition and metabolic potential. In contrast, microbial activity at deeper aphotic waters were strongly influenced by other organic matter input than sinking marine snow (e.g. sediment resuspension of benthic organic matter, remineralisation of terrestrially derived organic matter, etc.), severing the link between community structure and metabolic potential. Taken together, different organic matter sources shape microbial activity, but not community composition, in New Zealand fjords.Sven P. Tobias-HünefeldtStephen R. WingFederico BaltarSergio E. MoralesNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sven P. Tobias-Hünefeldt Stephen R. Wing Federico Baltar Sergio E. Morales Changes in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords
description	Abstract Fjords are semi-enclosed marine systems with unique physical conditions that influence microbial community composition and structure. Pronounced organic matter and physical condition gradients within fjords provide a natural laboratory for the study of changes in microbial community structure and metabolic potential in response to environmental conditions. Photosynthetic production in euphotic zones sustains deeper aphotic microbial activity via organic matter sinking, augmented by large terrestrial inputs. Previous studies do not consider both prokaryotic and eukaryotic communities when linking metabolic potential and activity, community composition, and environmental gradients. To address this gap we profiled microbial functional potential (Biolog Ecoplates), bacterial abundance, heterotrophic production (3H-Leucine incorporation), and prokaryotic/eukaryotic community composition (16S and 18S rRNA amplicon gene sequencing). Similar factors shaped metabolic potential, activity and community (prokaryotic and eukaryotic) composition across surface/near surface sites. However, increased metabolic diversity at near bottom (aphotic) sites reflected an organic matter influence from sediments. Photosynthetically produced particulate organic matter shaped the upper water column community composition and metabolic potential. In contrast, microbial activity at deeper aphotic waters were strongly influenced by other organic matter input than sinking marine snow (e.g. sediment resuspension of benthic organic matter, remineralisation of terrestrially derived organic matter, etc.), severing the link between community structure and metabolic potential. Taken together, different organic matter sources shape microbial activity, but not community composition, in New Zealand fjords.
format	article
author	Sven P. Tobias-Hünefeldt Stephen R. Wing Federico Baltar Sergio E. Morales
author_facet	Sven P. Tobias-Hünefeldt Stephen R. Wing Federico Baltar Sergio E. Morales
author_sort	Sven P. Tobias-Hünefeldt
title	Changes in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords
title_short	Changes in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords
title_full	Changes in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords
title_fullStr	Changes in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords
title_full_unstemmed	Changes in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords
title_sort	changes in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/28bb44daa80d4a97a62393c7419f4c6c
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Changes in microbial community phylogeny and metabolic activity along the water column uncouple at near sediment aphotic layers in fjords

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