Hidden biofilms in a far northern lake and implications for the changing Arctic

Abstract Shallow lakes are common across the Arctic landscape and their ecosystem productivity is often dominated by benthic, cyanobacterial biofilms. Many of these water bodies freeze to the bottom and are biologically inactive during winter, but full freeze-up is becoming less common with Arctic w...

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Autores principales:	Vani Mohit, Alexander Culley, Connie Lovejoy, Frédéric Bouchard, Warwick F. Vincent
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Microbial ecology QR100-130
Acceso en línea:	https://doaj.org/article/2ada85fc09a84e2fbe1d89cdfbc13da5
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spelling	oai:doaj.org-article:2ada85fc09a84e2fbe1d89cdfbc13da52021-12-02T12:33:55ZHidden biofilms in a far northern lake and implications for the changing Arctic10.1038/s41522-017-0024-32055-5008https://doaj.org/article/2ada85fc09a84e2fbe1d89cdfbc13da52017-07-01T00:00:00Zhttps://doi.org/10.1038/s41522-017-0024-3https://doaj.org/toc/2055-5008Abstract Shallow lakes are common across the Arctic landscape and their ecosystem productivity is often dominated by benthic, cyanobacterial biofilms. Many of these water bodies freeze to the bottom and are biologically inactive during winter, but full freeze-up is becoming less common with Arctic warming. Here we analyzed the microbiome structure of newly discovered biofilms at the deepest site of a perennially ice-covered High Arctic lake as a model of polar microbial communities that remain unfrozen throughout the year. Biofilms were also sampled from the lake’s shallow moat region that melts out and refreezes to the bottom annually. Using high throughput small subunit ribosomal RNA sequencing, we found more taxonomic richness in Bacteria, Archaea and microbial eukaryotes in the perennially unfrozen biofilms compared to moat communities. The deep communities contained both aerobic and anaerobic taxa including denitrifiers, sulfate reducers, and methanogenic Archaea. The water overlying the deep biofilms was well oxygenated in mid-summer but almost devoid of oxygen in spring, indicating anoxia during winter. Seasonally alternating oxic-anoxic regimes may become increasingly widespread in polar biofilms as fewer lakes and ponds freeze to the bottom, favoring prolonged anaerobic metabolism and greenhouse gas production during winter darkness.Vani MohitAlexander CulleyConnie LovejoyFrédéric BouchardWarwick F. VincentNature PortfolioarticleMicrobial ecologyQR100-130ENnpj Biofilms and Microbiomes, Vol 3, Iss 1, Pp 1-4 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Microbial ecology QR100-130
spellingShingle	Microbial ecology QR100-130 Vani Mohit Alexander Culley Connie Lovejoy Frédéric Bouchard Warwick F. Vincent Hidden biofilms in a far northern lake and implications for the changing Arctic
description	Abstract Shallow lakes are common across the Arctic landscape and their ecosystem productivity is often dominated by benthic, cyanobacterial biofilms. Many of these water bodies freeze to the bottom and are biologically inactive during winter, but full freeze-up is becoming less common with Arctic warming. Here we analyzed the microbiome structure of newly discovered biofilms at the deepest site of a perennially ice-covered High Arctic lake as a model of polar microbial communities that remain unfrozen throughout the year. Biofilms were also sampled from the lake’s shallow moat region that melts out and refreezes to the bottom annually. Using high throughput small subunit ribosomal RNA sequencing, we found more taxonomic richness in Bacteria, Archaea and microbial eukaryotes in the perennially unfrozen biofilms compared to moat communities. The deep communities contained both aerobic and anaerobic taxa including denitrifiers, sulfate reducers, and methanogenic Archaea. The water overlying the deep biofilms was well oxygenated in mid-summer but almost devoid of oxygen in spring, indicating anoxia during winter. Seasonally alternating oxic-anoxic regimes may become increasingly widespread in polar biofilms as fewer lakes and ponds freeze to the bottom, favoring prolonged anaerobic metabolism and greenhouse gas production during winter darkness.
format	article
author	Vani Mohit Alexander Culley Connie Lovejoy Frédéric Bouchard Warwick F. Vincent
author_facet	Vani Mohit Alexander Culley Connie Lovejoy Frédéric Bouchard Warwick F. Vincent
author_sort	Vani Mohit
title	Hidden biofilms in a far northern lake and implications for the changing Arctic
title_short	Hidden biofilms in a far northern lake and implications for the changing Arctic
title_full	Hidden biofilms in a far northern lake and implications for the changing Arctic
title_fullStr	Hidden biofilms in a far northern lake and implications for the changing Arctic
title_full_unstemmed	Hidden biofilms in a far northern lake and implications for the changing Arctic
title_sort	hidden biofilms in a far northern lake and implications for the changing arctic
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/2ada85fc09a84e2fbe1d89cdfbc13da5
work_keys_str_mv	AT vanimohit hiddenbiofilmsinafarnorthernlakeandimplicationsforthechangingarctic AT alexanderculley hiddenbiofilmsinafarnorthernlakeandimplicationsforthechangingarctic AT connielovejoy hiddenbiofilmsinafarnorthernlakeandimplicationsforthechangingarctic AT fredericbouchard hiddenbiofilmsinafarnorthernlakeandimplicationsforthechangingarctic AT warwickfvincent hiddenbiofilmsinafarnorthernlakeandimplicationsforthechangingarctic
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Hidden biofilms in a far northern lake and implications for the changing Arctic

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