A halophilic archaeal-bacterial consortium from the world's largest lithium reserve in the Salar de Atacama, Chile. This community thrives in extreme hypersaline brines with lithium concentrations up to 1,500 ppm (1.5 g/L) and total salinity ranging from 34.7% (natural brine) to 55.6% (concentrated brine during industrial processing). The community is strongly dominated by halophilic archaea of the family Halobacteriaceae, with natural brines showing higher archaeal diversity (Halovenus 26.8%, Natronomonas 20.1%, Haloarcula 14%, Halobacterium 13%) compared to concentrated brines where Halovenus becomes even more dominant (41%). Bacterial diversity is phylogenetically richer in concentrated brines, with Rhodothermaceae (represented solely by Salinibacter, 56% in natural brine) being the most abundant bacterial family. The community demonstrates remarkable lithium tolerance and adaptation to chaotropic stress, making it highly relevant for understanding microbial ecology in extreme saline environments and potential biotechnological applications in lithium extraction and critical mineral bioprocessing. Lithium acts as a modulator of microbial richness and diversity, with bacterial diversity increasing and archaeal diversity decreasing as lithium concentration rises during industrial processing.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Halovenus | NCBITaxon:1377992 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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DOMINANT |
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| Natronomonas | NCBITaxon:63743 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
CROSS_FEEDER
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ABUNDANT |
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| Haloarcula | NCBITaxon:2237 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
SECONDARY_FERMENTER
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ABUNDANT |
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| Halobacterium | NCBITaxon:2239 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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ABUNDANT |
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| Salinibacter | NCBITaxon:146918 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
CROSS_FEEDER
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DOMINANT |
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| Staphylococcaceae members — ontology label: Staphylococcaceae | NCBITaxon:90964 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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ABUNDANT |
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Ecological Interactions
The graph shows only explicitly linked interaction participants. Community members without an asserted participant link are omitted; membership alone does not imply an interaction.
Community Composition Across Natural and Concentrated Brines
The surveyed natural and industrially concentrated brines differed in taxonomic composition: bacterial phylogenetic richness/diversity was higher in concentrated brine, whereas archaeal diversity was greater in natural brine. These are community profiles across changing ionic composition and salinity, not a controlled lithium-only effect or a mutual benefit between named taxa. The listed participants identify the existing curated subset, not a complete community census or evidence that every member occurs in both samples. Salinibacter was detected in natural brine but not the concentrated sample. Specific osmoadaptation, substrate exchange and nutrient-recycling mechanisms remain unmeasured by this comparison.
Participating Taxa: Halovenus, Natronomonas, Haloarcula, Halobacterium, Salinibacter, Staphylococcaceae members
Evidence
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doi:10.1029/2018JG004621 - SUPPORT (IN_VIVO)"Further, our results showed that Bacteria were phylogenetically more diverse and rich in the concentrated brine, while archaeal diversity was maximized in the natural brine"
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Which physiological or intertaxon mechanisms account for the observed brine community differences?
The primary study measures composition in two brines and discusses candidate adaptation mechanisms using background literature. It does not isolate lithium from covarying ions/salinity or establish the former graph's organic degradation, closed nutrient recycling, phototrophy and functional-redundancy claims. Those four nodes and both unsupported directions are removed. This is an evidentiary limit, not proof that the processes are absent from the ecosystem.
Attaches to: ecological_interactions#Community Composition Across Natural and Concentrated Brines
1 evidence item(s)
Further, our results showed that Bacteria were phylogenetically more diverse and rich in the concentrated brine, while archaeal diversity was maximized in the natural brine
Supports the measured community diversity comparison, not lithium-only causation or a particular physiological adaptation.
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| Lithium Concentration | 1,500 | mg/L |
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| Total Salinity | 34.7-55.6 | % (w/v) |
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| Temperature | 37 | °C |
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| pH | 5-6 | pH units |
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| Altitude and Solar Radiation | 2,300 | m above sea level |
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| Salar Size and Lithium Reserve Status | 3,000 | km² |
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Growth Media
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