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  • 1
    Electronic Resource
    Electronic Resource
    Diversity of bacterial communities in Adirondack lakes: do species assemblages reflect lake water chemistry? (1999)
    Springer
    Hydrobiologia 401 (1999), S. 77-96 
    Details
    ISSN: 1573-5117
    Keywords: bacterial diversity ; acidification ; Adirondack lakes ; aluminum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bacterial diversity was examined in six lakes located in the Adirondack Mountains of upstate New York. This region receives significant anthropogenic atmospheric inputs of strong mineral acids resulting in decreases in pH and acid neutralizing capacity (ANC) in many of the lakes. Statistical methods including correlation and cluster analysis were used to determine if there were significant associations between phylotypes and water chemistry variables. Direct effects of acidification, pH and ANC, were not significantly correlated with any of the broadest level taxonomic classifications (equivalent to class or order), but may be correlated with subgroups within these classifications. Indirect influences of acidification were suggested by significant correlations of phylotypes with aluminum chemistry. There were positive correlations between the relative abundance of the γ subdivision of the Proteobacteria and total aluminum (r 2= 0.70,p= 0.04), monomeric aluminum (r 2= 0.78, p= 0.02) and non-labile aluminum (r 2= 0.92, p= 0.002). The ACK1 clade of the β-Proteobacteria (Adirondack clade 1) was correlated with monomeric aluminum (r 2= 0.71, p=0.03) and non-labile aluminum (r 2= 0.73, p= 0.03). Significant negative correlations were found between the relative abundance of the Cytophaga-Flexibacter-Bacteroides phylum and total aluminum (r 2= 0.74, p= 0.03), and the High G+C subdivision of the Gram Positive phylum with total aluminum (r 2 0.70, p= 0.04). Dissolved organic carbon (DOC) concentrations may also influence bacteria through amelioration of aluminum toxicity and as a carbon source. There were significant positive correlations between DOC and the relative abundance of the γ (r 2= 0.66, p= 0.05) and β (r 2= 0.78, p= 0.02) subdivisions and the ACK1 clade (r 2= 0.84, p= 0.01). Additional significant correlations were also noted between specific phylotypes and certain macro- and micro-nutrients. The results of this study indicate that water chemistry can have a direct influence on bacterial lake assemblages and that in acid stressed lakes aluminum chemistry and DOC concentrations may play a particularly important role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003782209607
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    IODP Expedition 337, Shimokita Deep Coalbed Biosphere (2015)
    PANGAEA
    In:  Supplement to: Inagaki, F; Hinrichs, Kai-Uwe; Kubo, Y; Bowles, Marshall W; Heuer, Verena B; Hong, W-L; Hoshino, Tatsuhiko; Ijiri, Akira; Imachi, H; Ito, M; Kaneko, Masanori; Lever, Mark A; Lin, Yu-Shih; Methe, B A; Morita, S; Morono, Yuki; Tanikawa, Wataru; Bihan, M; Bowden, Stephen A; Elvert, Marcus; Glombitza, Clemens; Gross, D; Harrington, G J; Hori, T; Li, K; Limmer, D; Liu, Chiung-Hui; Murayama, M; Ohkouchi, Naohiko; Ono, Shuhei; Park, Young-Soo; Phillips, S C; Prieto-Mollar, Xavier; Purkey, M; Riedinger, Natascha; Sanada, Yoshinori; Sauvage, J; Snyder, Glen T; Susilawati, R; Takano, Yoshinori; Tasumi, E; Terada, Takeshi; Tomaru, Hitoshi; Trembath-Reichert, E; Wang, D T; Yamada, Y (2015): Exploring deep microbial life in coal-bearing sediment down to ~2.5 km below the ocean floor. Science, 439 (6246), 420-424, https://doi.org/10.1126/science.aaa6882
    Details
    Publication Date: 2023-04-29
    Description: Microbial life inhabits deeply buried marine sediments, but the extent of this vast ecosystem remains poorly constrained. Here we provide evidence for the existence of microbial communities in ~40° to 60°C sediment associated with lignite coal beds at ~1.5 to 2.5 km below the seafloor in the Pacific Ocean off Japan. Microbial methanogenesis was indicated by the isotopic compositions of methane and carbon dioxide, biomarkers, cultivation data, and gas compositions. Concentrations of indigenous microbial cells below 1.5 km ranged from 〈10 to ~10**4 cells cm**-3. Peak concentrations occurred in lignite layers, where communities differed markedly from shallower subseafloor communities and instead resembled organotrophic communities in forest soils. This suggests that terrigenous sediments retain indigenous community members tens of millions of years after burial in the seabed.
    Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 3
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    The nonfermentable dietary fiber hydroxypropyl methylcellulose modulates intestinal microbiota [Research Communications] (2013)
    The Federation of American Societies for Experimental Biology (FASEB)
    Details
    Publication Date: 2013-02-01
    Description: Diet influences host metabolism and intestinal microbiota; however, detailed understanding of this tripartite interaction is limited. To determine whether the nonfermentable fiber hydroxypropyl methylcellulose (HPMC) could alter the intestinal microbiota and whether such changes correlated with metabolic improvements, C57B/L6 mice were normalized to a high-fat diet (HFD), then either maintained on HFD (control), or switched to HFD supplemented with 10% HPMC, or a low-fat diet (LFD). Compared to control treatment, both LFD and HPMC reduced weight gain (11.8 and 5.7 g, respectively), plasma cholesterol (23.1 and 19.6%), and liver triglycerides (73.1 and 44.6%), and, as revealed by 454-pyrosequencing of the microbial 16S rRNA gene, decreased microbial α-diversity and differentially altered intestinal microbiota. Both LFD and HPMC increased intestinal Erysipelotrichaceae (7.3- and 12.4-fold) and decreased Lachnospiraceae (2.0- and 2.7-fold), while only HPMC increased Peptostreptococcaceae (3.4-fold) and decreased Ruminococcaceae (2.7-fold). Specific microorganisms were directly linked with weight change and metabolic parameters in HPMC and HFD mice, but not in LFD mice, indicating that the intestinal microbiota may play differing roles during the two dietary modulations. This work indicates that HPMC is a potential prebiotic fiber that influences intestinal microbiota and improves host metabolism.—Cox, L. M., Cho, I., Young, S. A., Kerr Anderson, W. H., Waters, B. J., Hung, S.-C., Gao, Z., Mahana, D., Bihan, M., Alekseyenko, A. V., Methé, B. A., Blaser, M. J. The nonfermentable dietary fiber hydroxypropyl methylcellulose modulates intestinal microbiota.
    Print ISSN: 0892-6638
    Electronic ISSN: 1530-6860
    Topics: Biology
    Published by The Federation of American Societies for Experimental Biology (FASEB)
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    PAPER CURRENT
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