Home About Browse Search
Svenska


Mercury Methylating Microbial Community Structure in Boreal Wetlands Explained by Local Physicochemical Conditions

Xu, Jingying and Liem-Nguyen, Van and Buck, Moritz and Bertilsson, Stefan and Bjorn, Erik and Bravo, Andrea G. (2021). Mercury Methylating Microbial Community Structure in Boreal Wetlands Explained by Local Physicochemical Conditions. Frontiers in Environmental Science. 8 , 518662
[Research article]

[img] PDF
1MB

Abstract

The potent neurotoxin methylmercury (MeHg) is a major concern due to its negative effects on wildlife and human health. Boreal wetlands play a crucial role in Hg cycling on a global scale, and therefore, it is crucial to understand the biogeochemical processes involved in MeHg formation in this landscape element. By combining high-throughput hgcA amplicon sequencing with molecular barcoding, we reveal diverse clades of potential Hg-II methylators in a wide range of wetland soils. Among Bacteria, Desulfuromonadota (14% of total reads), Desulfurobacterota_A, and Desulfurobacterota (up to 6% of total reads), previously classified as Deltaproteobacteria, were important members of the hgcA+ microbial community in the studied wetlands. We also identified Actinobacteriota (9.4% of total reads), Bacteroidota (2% of total reads), and Firmicutes (1.2% of total reads) as members of the hgcA+ microbial community. Within Archaea, Methanosarcinales represented up to 2.5% of the total reads. However, up to half of the hgcA+ community could not be resolved beyond domain Bacteria. Our survey also shows that local physicochemical conditions, such as pH, nutrient concentrations, water content, and prevailing redox states, are important for shaping the hgcA+ microbial community structure across the four studied wetlands. Furthermore, we observed a significant correlation between Hg-II methylation rate constants and the structure of the hgcA+ microbial community. Our findings expand the current knowledge on the hgcA+ microbial community composition in wetlands and the physicochemical factors underpinning spatial heterogeneity in such communities.

Authors/Creators:Xu, Jingying and Liem-Nguyen, Van and Buck, Moritz and Bertilsson, Stefan and Bjorn, Erik and Bravo, Andrea G.
Title:Mercury Methylating Microbial Community Structure in Boreal Wetlands Explained by Local Physicochemical Conditions
Series Name/Journal:Frontiers in Environmental Science
Year of publishing :2021
Volume:8
Article number:518662
Number of Pages:14
Publisher:FRONTIERS MEDIA SA
ISSN:2296-665X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Microbiology (Microbiology in the medical area to be 30109)
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:wetlands, methylmercury, mercury methylation, hgcA, community composition, bacteria, mercury, drivers
URN:NBN:urn:nbn:se:slu:epsilon-p-111119
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111119
Additional ID:
Type of IDID
DOI10.3389/fenvs.2020.518662
Web of Science (WoS)000625143900001
ID Code:22807
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:22 Mar 2021 07:03
Metadata Last Modified:22 Mar 2021 07:11

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits