NDLI: Communities of neutrophilic iron-oxidizing microorganisms of ferruginous springs of various types and their involvement in fractionation of stable iron isotopes

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Communities of neutrophilic iron-oxidizing microorganisms of ferruginous springs of various types and their involvement in fractionation of stable iron isotopes

Content Provider	Springer Nature Link
Author	Dubinina, G. A. Sorokina, A. Yu. Gapeeva, M. V. Dolotov, A. V.
Copyright Year	2012
Abstract	Abundance and structure of the communities of neutrophilic lithotrophic iron-oxidizing bacteria (FeOB) inhabiting four low-mineralized ferruginous springs of the Marcial Waters Resort (South Karelia, Russia) and the brackish chalybeate spring of the Staraya Russa Resort (Novgorod region, Russia), were investigated, as well as the physicochemical conditions of these environments. In fresh iron-containing precipitates collected near the spring outlets and within the spring-discharge areas, as well as along the spring watercourses, the numbers of unicellular FeOB enumerated on nutrient media ranged from 10$^{5}$ to 10$^{7}$ cells per 1 mL of sediments irrespective of the initial Fe(II) concentration (11–126 mg L$^{−1}$). In the spring waters and along the spring watercourses inhabited by iron-oxidizing bacteria, the concentration of dissolved oxygen did not exceed 0.05–0.1 mg L$^{−1}$. Unicellular FeOB were predominant in three springs, while in the springs with relatively low Fe(II) concentrations (11–22 mg L$^{−1}$), various morphological forms of Gallionella and uncultured forms of the iron-oxidizing bacterium Toxothrix trichogenes prevailed. In the model experiments with the water samples collected in the ferruginous springs and bogs under controlled conditions, the fractionation of stable iron isotopes and the rate of iron oxidation were found to depend on the oxygen regime and, to a lesser extent, on the initial Fe(II) concentration. The maximum enrichment of the iron oxides formed during the simulation experiments with the light $^{54}$Fe isotope was observed during bacterial oxidation under microaerobic conditions at O$_{2}$ concentrations of 0.1–0.3 mg L$^{−1}$ and in the cultures of iron-oxidizing bacteria. During the abiogenic oxidation of Fe(II), the extent of stable isotope fractionation was 1.5–2 times lower. Enrichment of Fe(III) oxides with the light $^{54}$Fe isotope (3- to 5-fold) was considerably lower at high rates of both the biogenic and abiogenic processes of iron oxidation under aerobic conditions; however, it was more intense during the bacterial processes. Comparison of the rates of enrichment of Fe(III) oxides with the light isotope during the model experiments with pure and enrichment cultures of iron-oxidizing bacteria from the sediments of ferruginous springs and bogs revealed that the biogenic factor plays a key role in the oxidation processes of the iron cycle, as well as in the differentiation of the composition of stable iron isotopes in the studied ecosystems.
Starting Page	90
Ending Page	97
Page Count	8
File Format	PDF
ISSN	00262617
Journal	Microbiology
Volume Number	81
Issue Number	1
e-ISSN	16083237
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-02-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	neutrophilic iron-oxidizing bacteria stable iron isotopes fractionation Microbiology Medical Microbiology
Content Type	Text
Resource Type	Article
Subject	Microbiology Applied Microbiology and Biotechnology

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