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  Diversity and vertical distribution of magnetotactic bacteria along chemical gradients in freshwater microcosms

Flies, C. B., Jonkers, H. M., de Beer, D., Bosselmann, K., Böttcher, M. E., & Schüler, D. (2005). Diversity and vertical distribution of magnetotactic bacteria along chemical gradients in freshwater microcosms. FEMS Microbiology Ecology, 52(2), 185-195.

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 Creators:
Flies, C. B.1, Author           
Jonkers, H. M.2, Author           
de Beer, D.2, Author           
Bosselmann, K.3, Author           
Böttcher, M. E.4, Author           
Schüler, D.1, Author           
Affiliations:
1Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481695              
2Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481711              
3Microbial Habitat Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481709              
4Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481693              

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Free keywords: magnetotactic bacteria; vertical distribution; chemical gradient; freshwater sediment; microsensors
 Abstract: The vertical distribution of magnetotactic bacteria along various physico-chemical gradients in freshwater microcosms was analyzed by a combined approach of viable cell counts, 16S rRNA gene analysis, microsensor profiling and biogeochemical methods. The occurrence of magnetotactic bacteria was restricted to a narrow sediment layer overlapping or closely below the maximum oxygen and nitrate penetration depth. Different species showed different preferences within vertical gradients, but the largest proportion (63-98%) of magnetotactic bacteria was detected within the suboxic zone. In one microcosm the community of magnetotactic bacteria was dominated by one species of a coccoid "Alphaproteobacterium", as detected by denaturing gradient gel electrophoresis in sediment horizons from 1 to 10 mm depth. Maximum numbers of magnetotactic bacteria were up to 1.5 x 10(7) cells/cm3, which corresponded to 1% of the total cell number in the upper sediment layer. The occurrence of magnetotactic bacteria coincided with the availability of significant amounts (6-60 microM) of soluble Fe(II), and in one sample with hydrogen sulfide (up to 40 microM). Although various trends were clearly observed, a strict correlation between the distribution of magnetotactic bacteria and individual geochemical parameters was absent. This is discussed in terms of metabolic adaptation of various strains of magnetotactic bacteria to stratified sediments and diversity of the magnetotactic bacterial communities.

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Language(s): eng - English
 Dates: 2005-04-01
 Publication Status: Issued
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 256070
ISI: 000228276200005
 Degree: -

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Title: FEMS Microbiology Ecology
Source Genre: Journal
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Publ. Info: Amsterdam : Oxford University Press
Pages: - Volume / Issue: 52 (2) Sequence Number: - Start / End Page: 185 - 195 Identifier: ISSN: 0168-6496
CoNE: https://pure.mpg.de/cone/journals/resource/954925526820_1