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Vertical distribution of Fe and Fe(III)-reducing bacteria in the sediments of Lake Donghu, China.
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- Author(s): Tian, Cuicui; Wang, Chunbo; Tian, Yingying; Wu, Xingqiang; Xiao, Bangding
- Source:
Canadian Journal of Microbiology; Aug2015, Vol. 61 Issue 8, p575-583, 9p, 4 Charts, 4 Graphs, 1 Map- Subject Terms:
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- Abstract: In lake sediments, iron (Fe) is the most versatile element, and the redox cycling of Fe has a wide influence on the biogeochemical cycling of organic and inorganic substances. The aim of the present study was to analyze the vertical distribution of Fe and Fe(III)-reducing bacteria (FeRB) in the surface sediment (30 cm) of Lake Donghu, China. At the 3 sites we surveyed, FeRB and Fe(II)-oxidizing bacteria (FeOB) coexisted in anoxic sediments. Geobacter-related FeRB accounted for 5%-31% of the total Bacteria, while Gallionella-related FeOB accounted for only 0.1%-1.3%. A significant correlation between the relative abundance of poorly crystalline Fe and Geobacter spp. suggested that poorly crystalline Fe favored microbial Fe(III) reduction. Poorly crystalline Fe and Geobacter spp. were significantly associated with solid-phase Fe(II) and total inorganic phosphorus levels. Pore water Fe(II) concentrations negatively correlated with NO
3 - at all sites. We concluded that Geobacter spp. were abundant in the sediments of Lake Donghu, and the redox of Fe might participate in the cycling of nitrogen and phosphorus in sediments. These observations provided insight into the roles of microbial Fe cycling in lake sediments. [ABSTRACT FROM AUTHOR] - Abstract: Dans les sédiments de lacs, le Fe est l'élément le plus versatile et le cycle d'oxydoréduction du Fe a une influence généralisée sur le recyclage biochimique de substances organiques et inorganiques. Le but de la présente étude fut d'analyser la distribution verticale de bactéries réductrices de Fe et de Fe(III) (FeRB) dans le sédiment de surface (30 cm) du lac Donghu en Chine. Aux 3 emplacements examinés, les FeRB et les bactéries oxydant le Fe(II) (FeOB) ont coexisté dans les sédiments anoxiques. Les FeRB apparentées à Geobacter ont représenté 5−31 % des bactéries totales, tandis que les FeoB apparentées à Gallionella n'ont représenté que 0,1−1,3 %. Une corrélation significative entre l'abondance relative de Fe faiblement cristallin et les Geobacter spp. porte à croire que le Fe faiblement cristallin favoriserait la réduction microbienne du Fe(III). Le Fe faiblement cristallin et les espèces de Geobacter étaient significativement associés avec le Fe(II) en phase solide et la teneur en phosphore inorganique total. Les faibles concentrations de Fe(II) dans l'eau étaient inversement corrélées avec le NO
3 − à tous les emplacements. Nous avons conclu que les Geobacter spp. étaient abondants dans les sédiments du lac Donghu et que l'oxydoréduction du Fe participerait au recyclage du N et du P dans les sédiments. Ces observations mettent en lumière les rôles du recyclage du Fe microbien dans les sédiments de lacs. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR] - Abstract: Copyright of Canadian Journal of Microbiology is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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