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Evaluating Production of Cyclopentyl Tetraethers by Marine Group II Euryarchaeota in the Pearl River Estuary and Coastal South China Sea: Potential Impact on the TEX(86) Paleothermometer

TEX(86) [TetraEther indeX of glycerol dialkyl glycerol tetraethers (GDGTs) with 86 carbon atoms] has been widely applied to reconstruct (paleo-) sea surface temperature. Marine Group I (MG-I) Thaumarchaeota were thought to be the primary source of GDGTs constituting the TEX(86) formula; however, rec...

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Autores principales: Wang, Jin-Xiang, Xie, Wei, Zhang, Yi Ge, Meador, Travis B., Zhang, Chuanlun L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5671491/
https://www.ncbi.nlm.nih.gov/pubmed/29163386
http://dx.doi.org/10.3389/fmicb.2017.02077
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author Wang, Jin-Xiang
Xie, Wei
Zhang, Yi Ge
Meador, Travis B.
Zhang, Chuanlun L.
author_facet Wang, Jin-Xiang
Xie, Wei
Zhang, Yi Ge
Meador, Travis B.
Zhang, Chuanlun L.
author_sort Wang, Jin-Xiang
collection PubMed
description TEX(86) [TetraEther indeX of glycerol dialkyl glycerol tetraethers (GDGTs) with 86 carbon atoms] has been widely applied to reconstruct (paleo-) sea surface temperature. Marine Group I (MG-I) Thaumarchaeota were thought to be the primary source of GDGTs constituting the TEX(86) formula; however, recent research has suggested that Marine Group II (MG-II) Euryarchaeota may also contribute significantly to the GDGT pool in the ocean. Little is known regarding the potential impact of MG-II Euryarchaeota-derived GDGTs on TEX(86) values recorded in marine sediments. In this study, we assessed the relationship between distributions of GDGTs and MG-II Euryarchaeota and evaluated its potential effect on the TEX(86) proxy. Lipid and DNA analyses were performed on suspended particulate matter and surface sediments collected along a salinity gradient from the lower Pearl River (river water) and its estuary (mixing water) to the coastal South China Sea (SCS, seawater). TEX(86)-derived temperatures from the water column and surface sediments were significantly correlated and both were lower than satellite-based temperatures. The ring index (RI) values in these environments were higher than predicted from the calculated TEX(86)-RI correlation, indicating that the GDGT pool in the water column of the PR estuary and coastal SCS comprises relatively more cyclopentane rings, which thereby altered TEX(86) values. Furthermore, the abundance of MG-II Euryarchaeota 16S rRNA gene in the mixing water was two to three orders of magnitude higher than those observed in the river or seawater. Significant linear correlations were observed between the gene abundance ratio of MG-II Euryarchaeota to total archaea and the fractional abundance of GDGTs with cyclopentane rings. Collectively, these results suggest that MG-II Euryarchaeota likely produce a large proportion of GDGTs with 1–4 cyclopentane moieties, which may bias TEX(86) values in the water column and sediments. As such, valid interpretation of TEX(86) values in the sediment record, particularly in coastal oceans, should consider the contribution from MG-II Euryarchaeota.
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spelling pubmed-56714912017-11-21 Evaluating Production of Cyclopentyl Tetraethers by Marine Group II Euryarchaeota in the Pearl River Estuary and Coastal South China Sea: Potential Impact on the TEX(86) Paleothermometer Wang, Jin-Xiang Xie, Wei Zhang, Yi Ge Meador, Travis B. Zhang, Chuanlun L. Front Microbiol Microbiology TEX(86) [TetraEther indeX of glycerol dialkyl glycerol tetraethers (GDGTs) with 86 carbon atoms] has been widely applied to reconstruct (paleo-) sea surface temperature. Marine Group I (MG-I) Thaumarchaeota were thought to be the primary source of GDGTs constituting the TEX(86) formula; however, recent research has suggested that Marine Group II (MG-II) Euryarchaeota may also contribute significantly to the GDGT pool in the ocean. Little is known regarding the potential impact of MG-II Euryarchaeota-derived GDGTs on TEX(86) values recorded in marine sediments. In this study, we assessed the relationship between distributions of GDGTs and MG-II Euryarchaeota and evaluated its potential effect on the TEX(86) proxy. Lipid and DNA analyses were performed on suspended particulate matter and surface sediments collected along a salinity gradient from the lower Pearl River (river water) and its estuary (mixing water) to the coastal South China Sea (SCS, seawater). TEX(86)-derived temperatures from the water column and surface sediments were significantly correlated and both were lower than satellite-based temperatures. The ring index (RI) values in these environments were higher than predicted from the calculated TEX(86)-RI correlation, indicating that the GDGT pool in the water column of the PR estuary and coastal SCS comprises relatively more cyclopentane rings, which thereby altered TEX(86) values. Furthermore, the abundance of MG-II Euryarchaeota 16S rRNA gene in the mixing water was two to three orders of magnitude higher than those observed in the river or seawater. Significant linear correlations were observed between the gene abundance ratio of MG-II Euryarchaeota to total archaea and the fractional abundance of GDGTs with cyclopentane rings. Collectively, these results suggest that MG-II Euryarchaeota likely produce a large proportion of GDGTs with 1–4 cyclopentane moieties, which may bias TEX(86) values in the water column and sediments. As such, valid interpretation of TEX(86) values in the sediment record, particularly in coastal oceans, should consider the contribution from MG-II Euryarchaeota. Frontiers Media S.A. 2017-10-31 /pmc/articles/PMC5671491/ /pubmed/29163386 http://dx.doi.org/10.3389/fmicb.2017.02077 Text en Copyright © 2017 Wang, Xie, Zhang, Meador and Zhang. 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) or licensor 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
Wang, Jin-Xiang
Xie, Wei
Zhang, Yi Ge
Meador, Travis B.
Zhang, Chuanlun L.
Evaluating Production of Cyclopentyl Tetraethers by Marine Group II Euryarchaeota in the Pearl River Estuary and Coastal South China Sea: Potential Impact on the TEX(86) Paleothermometer
title Evaluating Production of Cyclopentyl Tetraethers by Marine Group II Euryarchaeota in the Pearl River Estuary and Coastal South China Sea: Potential Impact on the TEX(86) Paleothermometer
title_full Evaluating Production of Cyclopentyl Tetraethers by Marine Group II Euryarchaeota in the Pearl River Estuary and Coastal South China Sea: Potential Impact on the TEX(86) Paleothermometer
title_fullStr Evaluating Production of Cyclopentyl Tetraethers by Marine Group II Euryarchaeota in the Pearl River Estuary and Coastal South China Sea: Potential Impact on the TEX(86) Paleothermometer
title_full_unstemmed Evaluating Production of Cyclopentyl Tetraethers by Marine Group II Euryarchaeota in the Pearl River Estuary and Coastal South China Sea: Potential Impact on the TEX(86) Paleothermometer
title_short Evaluating Production of Cyclopentyl Tetraethers by Marine Group II Euryarchaeota in the Pearl River Estuary and Coastal South China Sea: Potential Impact on the TEX(86) Paleothermometer
title_sort evaluating production of cyclopentyl tetraethers by marine group ii euryarchaeota in the pearl river estuary and coastal south china sea: potential impact on the tex(86) paleothermometer
topic Microbiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5671491/
https://www.ncbi.nlm.nih.gov/pubmed/29163386
http://dx.doi.org/10.3389/fmicb.2017.02077
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