ArticlePloS one2020
Microbial ecology and biogeochemistry of hypersaline sediments in Orca Basin.
Article in PloS one, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed, 24 citations in OpenAlex.
- Revealing unexplored bacterial and fungal variability in interconnected Antarctic brines.Current research in microbial sciences · 2026Article
- Dietary Glycine and Methyl Donors Remodel Gut Microbiota to Enhance Collagen Synthesis in Sea Cucumber (Biology · 2025Article
- ABC-type salt tolerance transporter genes are abundant and mutually shared among the microorganisms of the hypersaline Sambhar Lake.Extremophiles : life under extreme conditions · 2025Article
- Novel insights into the diversity of halophilic microorganisms and their functioning in hypersaline ecosystems.npj biodiversity · 2024Review
- Impact of dilution on stochastically driven methanogenic microbial communities of hypersaline anoxic sediments.FEMS microbiology ecology · 2023Article
- Sulfur-cycling chemolithoautotrophic microbial community dominates a cold, anoxic, hypersaline Arctic spring.Microbiome · 2023Article
- Vertical organization of microbial communities in Salineta hypersaline wetland, Spain.Frontiers in microbiology · 2023Article
- Active lithoautotrophic and methane-oxidizing microbial community in an anoxic, sub-zero, and hypersaline High Arctic spring.The ISME journal · 2022Article
- Microbial diversity gradients in the geothermal mud volcano underlying the hypersaline Urania Basin.Frontiers in microbiology · 2022Article
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Authors and funding
5 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In deep ocean hypersaline basins, the combination of high salinity, unusual ionic composition and anoxic conditions represents significant challenges for microbial life. We used geochemical porewater characterization and DNA sequencing based taxonomic surveys to enable environmental and microbial characterization of anoxic hypersaline sediments and brines in the Orca Basin, the largest brine basin in the Gulf of Mexico. Full-length bacterial 16S rRNA gene clone libraries from hypersaline sediments and the overlying brine were dominated by the uncultured halophilic KB1 lineage, Deltaproteobacteria related to cultured sulfate-reducing halophilic genera, and specific lineages of heterotrophic Bacteroidetes. Archaeal clones were dominated by members of the halophilic methanogen genus Methanohalophilus, and the ammonia-oxidizing Marine Group I (MG-I) within the Thaumarchaeota. Illumina sequencing revealed higher phylum- and subphylum-level complexity, especially in lower-salinity sediments from the Orca Basin slope. Illumina and clone library surveys consistently detected MG-I Thaumarchaeota and halotolerant Deltaproteobacteria in the hypersaline anoxic sediments, but relative abundances of the KB1 lineage differed between the two sequencing methods. The stable isotopic composition of dissolved inorganic carbon and methane in porewater, and sulfate concentrations decreasing downcore indicated methanogenesis and sulfate reduction in the anoxic sediments. While anaerobic microbial processes likely occur at low rates near their maximal salinity thresholds in Orca Basin, long-term accumulation of reaction products leads to high methane concentrations and reducing conditions within the Orca Basin brine and sediments.
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