The distribution of active iron‐cycling bacteria in marine and freshwater sediments is decoupled from geochemical gradients
| Autor: | Julia M. Otte, Andreas Kappler, Daniel Straub, Katja Laufer, Johannes Harter, Nia Blackwell, Sara Kleindienst |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Geologic Sediments PALUSTRIS STRAIN TIE-1 Denmark Iron 030106 microbiology Fresh Water SEQUENCE DATA Microbiology Shewanella 03 medical and health sciences FE(II) OXIDATION Germany RNA Ribosomal 16S FERROUS-IRON GALLIONELLA-FERRUGINEA Seawater 14. Life underwater Soil Microbiology Ecology Evolution Behavior and Systematics Total organic carbon Nitrates Bacteria biology Phototroph CABLE BACTERIA biology.organism_classification Anoxygenic photosynthesis ORGANIC-MATTER Lakes RNA Bacterial Microbial population biology SULFATE-REDUCING BACTERIA Environmental chemistry NITRATE REDUCTION Hoeflea Water Microbiology COMMUNITY STRUCTURE Oxidation-Reduction Geobacter |
| Zdroj: | Otte, J M, Harter, J, Laufer, K, Blackwell, N, Straub, D, Kappler, A & Kleindienst, S 2018, ' The distribution of active iron-cycling bacteria in marine and freshwater sediments is decoupled from geochemical gradients ', Environmental Microbiology, vol. 20, no. 7, pp. 2483-2499 . https://doi.org/10.1111/1462-2920.14260 EPIC3Environmental Microbiology, 20(7), pp. 2483-2499 |
| ISSN: | 1462-2920 1462-2912 |
| DOI: | 10.1111/1462-2920.14260 |
| Popis: | Microaerophilic, phototrophic and nitrate-reducing Fe(II)-oxidizers co-exist in coastal marine and littoral freshwater sediments. However, the in situ abundance, distribution and diversity of metabolically active Fe(II)-oxidizers remained largely unexplored. Here, we characterized the microbial community composition at the oxic-anoxic interface of littoral freshwater (Lake Constance, Germany) and coastal marine sediments (Kalo Vig and Norsminde Fjord, Denmark) using DNA-/RNA-based next-generation 16S rRNA (gene) amplicon sequencing. All three physiological groups of neutrophilic Fe(II)-oxidizing bacteria were found to be active in marine and freshwater sediments, revealing up to 0.2% anoxygenic photoferrotrophs (e.g., Rhodopseudomonas, Rhodobacter, Chlorobium), 0.1% microaerophilic Fe(II)-oxidizers (e.g., Mariprofundus, Hyphomonas, Gallionella) and 0.3% nitrate-reducing Fe(II)-oxidizers (e.g., Thiobacillus, Pseudomonas, Denitromonas, Hoeflea). Active Fe(III)-reducing bacteria (e.g., Shewanella, Geobacter) were most abundant (up to 2.8%) in marine sediments and co-occurred with cable bacteria (up to 4.5%). Geochemical profiles of Fe(III), Fe(II), O-2, light, nitrate and total organic carbon revealed a redox stratification of the sediments and explained 75%-85% of the vertical distribution of microbial taxa, while active Fe-cycling bacteria were found to be decoupled from geochemical gradients. We suggest that metabolic flexibility, microniches in the sediments, or interrelationships with cable bacteria might explain the distribution patterns of active Fe-cycling bacteria. |
| Databáze: | OpenAIRE |
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