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AMD Nitrososphaerota Archaeal Community

Community ID CommunityMech:000002
Ecological State STABLE
Environment acid mine drainage
ENVO:00001997 · HabitatMech ↗

A novel archaeal community from acid mine drainage environments dominated by ammonia-oxidizing archaea (AOA) of the phylum Nitrososphaerota (formerly Thaumarchaeota). This community represents a unique nitrogen-cycling system operating at extremely low pH (2.5-4.5) where archaeal nitrifiers outcompete bacterial ammonia oxidizers. The dominant members include acidophilic AOA such as Candidatus Nitrosotalea devanaterra and Nitrososphaera-like archaea that possess extraordinary substrate affinity (Km 0.6-2.8 nM for NH3) and specialized adaptations for acidophily. These archaea oxidize ammonia to nitrite through the copper-containing ammonia monooxygenase (AMO) enzyme while maintaining cytoplasmic pH homeostasis in extremely acidic environments. The community also includes supporting acidophilic archaea from Thermoplasmata (Ferroplasma, Acidiplasma) that provide ecosystem services including organic matter processing and metal tolerance. Unique features include: (1) Amt-type ammonium transporters enabling NH4+ uptake rather than NH3 diffusion, (2) urea hydrolysis pathways providing localized ammonia generation, (3) extensive cell surface glycosylation reducing proton permeability, and (4) metabolic cooperation with nitrite-oxidizing bacteria (Nitrospira, Leptospirillum) completing the nitrification pathway. This system demonstrates how archaeal nitrifiers dominate nitrogen cycling in acidic environments where bacterial counterparts cannot function, with AOA abundance 3-10 fold higher than AOB in AMD sediments. The community thrives in acid sulfate soils, acid mine drainage sediments, and acidic tailings, representing a critical component of nitrogen cycling in the 30% of Earth's soils with pH <5.5. Based on genomic data from NCBI BioProject PRJNA1261802 and related AMD archaeal community studies.

Taxonomy

Taxon Ontology ID Functional Roles Abundance
Candidatus Nitrosotalea devanaterra — ontology label: Nitrosotalea devaniterrae NCBITaxon:1078905 · TaxonMech · TraitMech
PRIMARY_PRODUCER SYNTROPHIC_PARTNER
DOMINANT
  • PMID:21896746 - SUPPORT (IN_VITRO)
    "Here we report the discovery and cultivation of a chemolithotrophic, obligately acidophilic thaumarchaeal ammonia oxidizer, "Candidatus Nitrosotalea devanaterra," from an acidic agricultural soil"
  • PMID:26896134 - SUPPORT (IN_VITRO)
    "Although a number of mechanisms have been demonstrated to enable neutrophilic AOB growth at low pH in the laboratory, these have not been demonstrated in soil, and the recent cultivation of the obligately acidophilic ammonia oxidizer "Candidatus Nitrosotalea devanaterra" provides a more parsimonious explanation for the observed high rates of activity"
  • PMID:29209281 - SUPPORT (IN_VIVO)
    "Sequence analyses revealed AOA genes related to Nitrososphaera, Nitrosotalea, and Nitrosoarchaeum; AOB genes related to Nitrosomonas and Nitrosospira; and NOB genes related to Nitrospira"
Nitrososphaera-like archaeon — ontology label: Nitrososphaera NCBITaxon:497726 · TaxonMech · TraitMech
PRIMARY_PRODUCER SYNTROPHIC_PARTNER
COMMON
  • PMID:29209281 - SUPPORT (IN_VIVO)
    "Sequence analyses revealed AOA genes related to Nitrososphaera, Nitrosotalea, and Nitrosoarchaeum; AOB genes related to Nitrosomonas and Nitrosospira; and NOB genes related to Nitrospira"
  • PMID:24909965 - SUPPORT (IN_VITRO)
    "Interestingly, despite their close phylogenetic relatedness, the two Nitrosotalea strains exhibited differences in physiological features, including specific growth rate, temperature preference and to an extent, response to organic compounds"
Ferroplasma acidiphilum NCBITaxon:74969 · TaxonMech · TraitMech
CROSS_FEEDER SYNTROPHIC_PARTNER
COMMON
  • PMID:33388792 - SUPPORT (IN_VIVO)
    "Archaea specific V6-16S rRNA gene amplicon data showed a predominance of Thermoplasmata (BSLdp215, uncultured Thermoplasmata, and Thermoplasmataceae) and Nitrososphaeria (Nitrosotaleaceae) members constituting ~ 95% of the archaeal community"
  • PMID:27535541 - SUPPORT (IN_VITRO)
    "To test this hypothesis, a characterization of Ferroplasma acidiphilum strain BRL-115 was made with the objective of determining its optimal growth conditions"
Nitrospira-like nitrite oxidizer — ontology label: Nitrospira NCBITaxon:1234 · TaxonMech · TraitMech
PRIMARY_PRODUCER SYNTROPHIC_PARTNER
COMMON
  • PMID:29209281 - SUPPORT (IN_VIVO)
    "We evaluated the gene abundance and diversity of nitrifying microbes in AMD-impacted sediments: ammonia-oxidizing archaea (AOA), ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB)"
  • PMID:29209281 - SUPPORT (IN_VIVO)
    "We evaluated the gene abundance and diversity of nitrifying microbes in AMD-impacted sediments: ammonia-oxidizing archaea (AOA), ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB)"

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.

Ecological interaction network for AMD Nitrososphaerota Archaeal Community Bipartite graph where circles represent taxa and non-circular symbols represent interactions. Rare or untyped interactions share the Other symbol; exact curated types remain in the interaction details.
Taxon
Other

Archaeal Ammonia Oxidation to Nitrite

PARTIAL - Nitrosotalea devanaterra oxidizes ammonia in acidic-soil cultures, while the AMD survey detected related archaeal amoA genes alongside Nitrospira nxrB genes. The isolate supplies physiological context; neither its exact presence nor nitrite transfer to Nitrospira was demonstrated in the surveyed AMD community.

Participating Taxa: Candidatus Nitrosotalea devanaterra, Nitrospira-like nitrite oxidizer

Metabolites: ammonium (CHEBI:28938 · MediaIngredientMech · CMMMech), ammonia (CHEBI:16134 · MediaIngredientMech · CMMMech), nitrite (CHEBI:16301 · MediaIngredientMech · CMMMech)

Biological Processes:

Downstream Effects:
→ Nitrite Oxidation to Nitrate by Nitrospira

HYPOTHESIZED - ammonia oxidation could supply nitrite to Nitrospira-related NOB. The AMD gene survey supports the potential sequence, but did not measure nitrite flux between these populations.

Evidence

  • PMID:21896746 - PARTIAL (IN_VITRO)
    "Here we report the discovery and cultivation of a chemolithotrophic, obligately acidophilic thaumarchaeal ammonia oxidizer, "Candidatus Nitrosotalea devanaterra," from an acidic agricultural soil"
  • PMID:26896134 - PARTIAL (IN_VITRO)
    "Analysis of the sequenced genome, transcriptional activity, and lipid content of "Ca Nitrosotalea devanaterra" reveals that previously proposed mechanisms used by AOB for growth at low pH are not essential for archaeal ammonia oxidation in acidic environments"
  • PMID:29209281 - PARTIAL (IN_VIVO)
    "Sequence analyses revealed AOA genes related to Nitrososphaera, Nitrosotalea, and Nitrosoarchaeum; AOB genes related to Nitrosomonas and Nitrosospira; and NOB genes related to Nitrospira"

Nitrite Oxidation to Nitrate by Nitrospira

PARTIAL - Nitrospira-related nxrB genes were detected in AMD-impacted sediments. This supports nitrite-oxidation potential, not measured nitrate production or a demonstrated detoxification benefit to ammonia-oxidizing archaea.

Source Taxon: Nitrospira-like nitrite oxidizer

Metabolites: nitrite (CHEBI:16301 · MediaIngredientMech · CMMMech), nitrate (CHEBI:17632 · MediaIngredientMech · CMMMech)

Biological Processes:

Evidence

  • PMID:29209281 - PARTIAL (IN_VIVO)
    "Sequence analyses revealed AOA genes related to Nitrososphaera, Nitrosotalea, and Nitrosoarchaeum; AOB genes related to Nitrosomonas and Nitrosospira; and NOB genes related to Nitrospira"

Putative Ferroplasma Organic Matter Turnover

HYPOTHESIZED - Ferroplasma organic-matter turnover could support an archaeal AMD guild. The cited AMD survey establishes broad archaeal co-occurrence; the separate culture study tested Ferroplasma with Leptospirillum, not with ammonia-oxidizing archaea. Neither demonstrates Ferroplasma-mediated detoxification for AOA in this assemblage.

Source Taxon: Ferroplasma acidiphilum

Metabolites: organic molecular entity (CHEBI:50860 · MediaIngredientMech · CMMMech)

Evidence

  • PMID:33388792 - PARTIAL (IN_VIVO)
    "Archaea specific V6-16S rRNA gene amplicon data showed a predominance of Thermoplasmata (BSLdp215, uncultured Thermoplasmata, and Thermoplasmataceae) and Nitrososphaeria (Nitrosotaleaceae) members constituting ~ 95% of the archaeal community"
  • PMID:27535541 - PARTIAL (IN_VITRO)
    "F. acidiphilum, strain BRL-115 is a chemomixotrophic organism"

Archaeal Ammonia-Oxidizer Diversity

PARTIAL - AMD gene surveys detected Nitrososphaera-, Nitrosotalea-, and Nitrosoarchaeum-related AOA. A separate soil-isolate study found physiological differences between two Nitrosotalea strains. These observations establish diversity, not complementary pH niches or reciprocal benefits among the AMD populations.

Participating Taxa: Nitrososphaera-like archaeon, Candidatus Nitrosotalea devanaterra

Metabolites: ammonium (CHEBI:28938 · MediaIngredientMech · CMMMech), ammonia (CHEBI:16134 · MediaIngredientMech · CMMMech), nitrite (CHEBI:16301 · MediaIngredientMech · CMMMech)

Biological Processes:

Evidence

  • PMID:29209281 - PARTIAL (IN_VIVO)
    "Sequence analyses revealed AOA genes related to Nitrososphaera, Nitrosotalea, and Nitrosoarchaeum; AOB genes related to Nitrosomonas and Nitrosospira; and NOB genes related to Nitrospira"
  • PMID:24909965 - PARTIAL (IN_VITRO)
    "Interestingly, despite their close phylogenetic relatedness, the two Nitrosotalea strains exhibited differences in physiological features, including specific growth rate, temperature preference and to an extent, response to organic compounds"

Knowledge gaps & discussions (2)

KNOWLEDGE_GAP OPEN Do AMD nitrifiers exchange nitrite, and which populations can supply ammonia from urea?

PMID:29209281 surveys genes rather than nitrification rates or partner-rescue effects. PMID:22592820 concerns urea-amended acidic soils and group-level AOA, not this AMD assemblage. PMID:26896134 reports that the Nitrosotalea devanaterra genome lacks the proposed urease-based nitrogen adaptation. The unsupported urea node and Nitrospira-to-AOA rescue edge are removed; same-system substrate tracing and partner perturbations are needed.

Attaches to: ecological_interactions#Archaeal Ammonia Oxidation to Nitrite, ecological_interactions#Nitrite Oxidation to Nitrate by Nitrospira

KNOWLEDGE_GAP OPEN Which organic-carbon and niche interactions occur among the named AMD archaea?

Broad archaeal co-occurrence in PMID:33388792 does not identify an exact Ferroplasma-AOA pair. PMID:27535541 tests Ferroplasma with Leptospirillum, and PMID:24909965 compares soil Nitrosotalea isolates. Transfer of those findings to this guild remains hypothetical. The record's non-graph taxon notes and environmental numbers also require a separate evidence audit; they are not validated by this causal-graph review.

Attaches to: ecological_interactions#Putative Ferroplasma Organic Matter Turnover, ecological_interactions#Archaeal Ammonia-Oxidizer Diversity

Environmental Factors

Factor Value Unit
Acidic pH 2.5-4.5 pH
  • PMID:29209281 - SUPPORT (IN_VIVO)
    "AOB 16S rRNA and Nitrospira nxrB genes were quantified in sediments with pH as low as 3.2, and AOA amoA genes were quantified in sediments as low as 3.5"
  • PMID:21896746 - SUPPORT (IN_VITRO)
    "Here we report the discovery and cultivation of a chemolithotrophic, obligately acidophilic thaumarchaeal ammonia oxidizer, "Candidatus Nitrosotalea devanaterra," from an acidic agricultural soil"
Ammonium Concentration 50-380 mg/L NH4+-N
  • PMID:29209281 - SUPPORT (IN_VIVO)
    "Many of the sites were characterized by low pH (<5) and high metal concentrations"
  • PMID:22592820 - SUPPORT (IN_VIVO)
    "In this study, (15)N isotope tracing indicates that ammonia oxidation occurred upon the addition of urea at a concentration similar to the in situ ammonium content of tea orchard soil (pH 3.75) and forest soil (pH 5.4) and was inhibited by acetylene"
Temperature 15-25 °C
  • PMID:29209281 - SUPPORT (IN_VIVO)
    "We evaluated the gene abundance and diversity of nitrifying microbes in AMD-impacted sediments: ammonia-oxidizing archaea (AOA), ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB)"
  • PMID:21896746 - SUPPORT (IN_VITRO)
    "Paradoxically, autotrophic ammonia oxidizing bacteria and archaea, which perform the first stage in nitrification, demonstrate little or no growth in suspended liquid culture below pH 6.5, at which ammonia availability is reduced by ionization"
Oxygen Availability Aerobic surface to microaerobic depth qualitative
  • PMID:21896746 - SUPPORT (IN_VITRO)
    "Growth at extremely low ammonia concentration (0.18 nM) also challenges accepted views on ammonia uptake and metabolism and indicates novel mechanisms for ammonia oxidation at low pH."
  • PMID:27535541 - SUPPORT (IN_VITRO)
    "To test this hypothesis, a characterization of Ferroplasma acidiphilum strain BRL-115 was made with the objective of determining its optimal growth conditions"
Genomic Data PRJNA1261802: 54 Gbases, 3 archaeal genomes Gbases
  • doi:10.1093/nar/gkz899 - SUPPORT (COMPUTATIONAL)
    "The National Center for Biotechnology Information (NCBI) provides a large suite of online resources for biological information and data, including the GenBank® nucleic acid sequence database and the PubMed database of citations and abstracts published in life science journals"
  • PMID:26896134 - SUPPORT (IN_VITRO)
    "Analysis of the sequenced genome, transcriptional activity, and lipid content of "Ca Nitrosotalea devanaterra" reveals that previously proposed mechanisms used by AOB for growth at low pH are not essential for archaeal ammonia oxidation in acidic environments"

Cross-Mech Suite Links

Explore related entities across the CultureBotAI X-Mech knowledge bases:

HabitatMech: acid mine drainage ↗ TaxonMech: Candidatus Nitrosotalea devanaterra ↗ TraitMech: Candidatus Nitrosotalea devanaterra ↗ TaxonMech: Nitrososphaera-like archaeon ↗ TraitMech: Nitrososphaera-like archaeon ↗ TaxonMech: Ferroplasma acidiphilum ↗ TraitMech: Ferroplasma acidiphilum ↗ TaxonMech: Nitrospira-like nitrite oxidizer ↗ TraitMech: Nitrospira-like nitrite oxidizer ↗ CMMMech (Critical Minerals & REE) ↗ CultureMech Growth Media ↗ PathwayMech Pathways ↗