Study of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary

Estuarine sediments are increasingly contaminated by heavy metals as a result of urbanization and human activities. Continuous multi-heavy metal accumulation in the ecosystem can provoke new effects on top of the complex environmental interactions already present in estuarine ecosystems. It is impor...

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Autores principales:	Jun Yi, Linus Shing Him Lo, Hongbin Liu, Pei-Yuan Qian, Jinping Cheng
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	estuarine sediments microbial communities heavy metals metal resistance genes ecological functions Science Q General. Including nature conservation, geographical distribution QH1-199.5
Acceso en línea:	https://doaj.org/article/fda216a161c347678d5f161ef4fc5764
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spelling	oai:doaj.org-article:fda216a161c347678d5f161ef4fc57642021-11-17T04:40:19ZStudy of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary2296-774510.3389/fmars.2021.741912https://doaj.org/article/fda216a161c347678d5f161ef4fc57642021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmars.2021.741912/fullhttps://doaj.org/toc/2296-7745Estuarine sediments are increasingly contaminated by heavy metals as a result of urbanization and human activities. Continuous multi-heavy metal accumulation in the ecosystem can provoke new effects on top of the complex environmental interactions already present in estuarine ecosystems. It is important to study their integrated influence on imperative microbial communities to reflect on the environmental and ecological risks they may impose. Inductively coupled plasma optical emission spectroscopy analysis for five metals Cd, Cr, Cu, Pb, and Zn showed that Cr and Cu concentrations in intertidal sediments of the urbanized Yangtze River estuary in China have consistently exceeded respective threshold effect concentration (TEC) levels. The geo-accumulation and potential ecological risk index results of the five metals showed that all sampling sites were weakly to moderately polluted, and at considerable to high ecological risk, respectively. Redundancy and correlation analyses showed that Zn followed by Cr in the ecosystem were explanatory of the shifts in recorded microbial community structures. However, the spatial variation in metal concentrations did not correspond to the selection of metal resistance genes (MRGs). Unlike many other dominant bacterial taxa, most of the sulfate-reducing bacteria (SRB) and associated sulfate respiration as the dominant microbially contributed ecological function were found to negatively correlate with Zn and total heavy metal pollution. Zn concentration was proposed to be a potent indicator for heavy metal pollution-associated microbial community compositional shifts under urbanized estuarine conditions. The associations between heavy metals and estuarine microbial communities in this study demonstrate the influence of heavy metals on microbial community structure and adaptations that is often overshadowed by environmental factors (i.e., salinity and nutrients).Jun YiLinus Shing Him LoHongbin LiuHongbin LiuPei-Yuan QianPei-Yuan QianJinping ChengJinping ChengJinping ChengFrontiers Media S.A.articleestuarine sedimentsmicrobial communitiesheavy metalsmetal resistance genesecological functionsScienceQGeneral. Including nature conservation, geographical distributionQH1-199.5ENFrontiers in Marine Science, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	estuarine sediments microbial communities heavy metals metal resistance genes ecological functions Science Q General. Including nature conservation, geographical distribution QH1-199.5
spellingShingle	estuarine sediments microbial communities heavy metals metal resistance genes ecological functions Science Q General. Including nature conservation, geographical distribution QH1-199.5 Jun Yi Linus Shing Him Lo Hongbin Liu Hongbin Liu Pei-Yuan Qian Pei-Yuan Qian Jinping Cheng Jinping Cheng Jinping Cheng Study of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary
description	Estuarine sediments are increasingly contaminated by heavy metals as a result of urbanization and human activities. Continuous multi-heavy metal accumulation in the ecosystem can provoke new effects on top of the complex environmental interactions already present in estuarine ecosystems. It is important to study their integrated influence on imperative microbial communities to reflect on the environmental and ecological risks they may impose. Inductively coupled plasma optical emission spectroscopy analysis for five metals Cd, Cr, Cu, Pb, and Zn showed that Cr and Cu concentrations in intertidal sediments of the urbanized Yangtze River estuary in China have consistently exceeded respective threshold effect concentration (TEC) levels. The geo-accumulation and potential ecological risk index results of the five metals showed that all sampling sites were weakly to moderately polluted, and at considerable to high ecological risk, respectively. Redundancy and correlation analyses showed that Zn followed by Cr in the ecosystem were explanatory of the shifts in recorded microbial community structures. However, the spatial variation in metal concentrations did not correspond to the selection of metal resistance genes (MRGs). Unlike many other dominant bacterial taxa, most of the sulfate-reducing bacteria (SRB) and associated sulfate respiration as the dominant microbially contributed ecological function were found to negatively correlate with Zn and total heavy metal pollution. Zn concentration was proposed to be a potent indicator for heavy metal pollution-associated microbial community compositional shifts under urbanized estuarine conditions. The associations between heavy metals and estuarine microbial communities in this study demonstrate the influence of heavy metals on microbial community structure and adaptations that is often overshadowed by environmental factors (i.e., salinity and nutrients).
format	article
author	Jun Yi Linus Shing Him Lo Hongbin Liu Hongbin Liu Pei-Yuan Qian Pei-Yuan Qian Jinping Cheng Jinping Cheng Jinping Cheng
author_facet	Jun Yi Linus Shing Him Lo Hongbin Liu Hongbin Liu Pei-Yuan Qian Pei-Yuan Qian Jinping Cheng Jinping Cheng Jinping Cheng
author_sort	Jun Yi
title	Study of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary
title_short	Study of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary
title_full	Study of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary
title_fullStr	Study of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary
title_full_unstemmed	Study of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary
title_sort	study of heavy metals and microbial communities in contaminated sediments along an urban estuary
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/fda216a161c347678d5f161ef4fc5764
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Study of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary

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