Abundant iron and sulfur oxidizers in the stratified sediment of a eutrophic freshwater reservoir with annual cyanobacterial blooms

Long Jin, Chang Soo Lee, Chi Yong Ahn, Hyung Gwan Lee, Sang-Hyup Lee, Hyeon Ho Shin, Dhongil Lim, Hee Mock Oh

Research output: Contribution to journalArticle

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Abstract

The microbial community in eutrophic freshwater sediment was investigated from a 67-cm-deep sediment core collected from the Daechung Reservoir in South Korea, where cyanobacterial blooms have occurred annually for the past 30 years. The majority of core sediments were characterized by dark-grayish, fine-grained mud with abundant gas-escaped and thinly laminated layers. Intervals of summer and winter seasons were represented by periodic peaks of geochemical profiles of parameters such as grain size and relative carbon mass ratios to various nutrients such as nitrogen, sulfur, and phosphorus. In bacteria, Proteobacteria (66.6%) was the most prevalent phylum, followed by Chloroflexi (8.9%), Bacteroidetes (5.1%), and Spirochaetes (2.6%). Archaea were also abundant, representing approximately half of the total prokaryotes in the sediments. Notably, three Bacteria (Sulfuricurvum, Sideroxydans, and Gallionella) and one Archaea (Thermoplasmata) accounted for 43.4% and 38.4% of the total bacteria and archaea, respectively, implying that iron and sulfur oxidizing microorganisms dominate in this eutrophic freshwater sediment. These results indicate that 1) eutrophic freshwater lakes in monsoon climates undergo a stratified sedimentary process with seasonal and annual variations in geochemical and microbial profiles, and 2) the microbial oxidative metabolism of iron and sulfur is notably active in sediments from a eutrophic lake.

Original languageEnglish
Article number43814
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 2017 Mar 7
Externally publishedYes

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Archaea
Fresh Water
Sulfur
Iron
Lakes
Bacteria
Gallionellaceae
Euryarchaeota
Chloroflexi
Bacteroidetes
Proteobacteria
Spirochaetales
Republic of Korea
Climate
Phosphorus
Nitrogen
Carbon
Gases
Food

ASJC Scopus subject areas

  • General

Cite this

Abundant iron and sulfur oxidizers in the stratified sediment of a eutrophic freshwater reservoir with annual cyanobacterial blooms. / Jin, Long; Lee, Chang Soo; Ahn, Chi Yong; Lee, Hyung Gwan; Lee, Sang-Hyup; Shin, Hyeon Ho; Lim, Dhongil; Oh, Hee Mock.

In: Scientific Reports, Vol. 7, 43814, 07.03.2017.

Research output: Contribution to journalArticle

Jin, Long ; Lee, Chang Soo ; Ahn, Chi Yong ; Lee, Hyung Gwan ; Lee, Sang-Hyup ; Shin, Hyeon Ho ; Lim, Dhongil ; Oh, Hee Mock. / Abundant iron and sulfur oxidizers in the stratified sediment of a eutrophic freshwater reservoir with annual cyanobacterial blooms. In: Scientific Reports. 2017 ; Vol. 7.
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abstract = "The microbial community in eutrophic freshwater sediment was investigated from a 67-cm-deep sediment core collected from the Daechung Reservoir in South Korea, where cyanobacterial blooms have occurred annually for the past 30 years. The majority of core sediments were characterized by dark-grayish, fine-grained mud with abundant gas-escaped and thinly laminated layers. Intervals of summer and winter seasons were represented by periodic peaks of geochemical profiles of parameters such as grain size and relative carbon mass ratios to various nutrients such as nitrogen, sulfur, and phosphorus. In bacteria, Proteobacteria (66.6{\%}) was the most prevalent phylum, followed by Chloroflexi (8.9{\%}), Bacteroidetes (5.1{\%}), and Spirochaetes (2.6{\%}). Archaea were also abundant, representing approximately half of the total prokaryotes in the sediments. Notably, three Bacteria (Sulfuricurvum, Sideroxydans, and Gallionella) and one Archaea (Thermoplasmata) accounted for 43.4{\%} and 38.4{\%} of the total bacteria and archaea, respectively, implying that iron and sulfur oxidizing microorganisms dominate in this eutrophic freshwater sediment. These results indicate that 1) eutrophic freshwater lakes in monsoon climates undergo a stratified sedimentary process with seasonal and annual variations in geochemical and microbial profiles, and 2) the microbial oxidative metabolism of iron and sulfur is notably active in sediments from a eutrophic lake.",
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