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Peer-reviewedCC BYInternational journal of molecular sciences

Water-Sediment Partitioning of a Neutrophilic Iron-Cycling Microbiome in the High-Altitude Dzhily-Su Mineral Springs (Mt. Elbrus).

  • Anna Olegovna Izotova1
  • Anastasia Victorovna Komova1
  • Lilia Zuberovna Zhinzhakova2
  • Komila Ravshanovna Khazieva1
  • Gennady Sozyrovich Kachmazov3
  • Christina Vitalievna Chaika1
  • Stepan Vladimirovich Toshchakov1
  1. 1National Research Center "Kurchatov Institute", Ac. Kurchatov Square, 1, Moscow 123098, Russia.
  2. 2High-Mountain Geophysical Institute, Lenina Ave., 2, Nalchik 360030, Russia.
  3. 3Faculty of Chemistry, Biology and Biotechnology, North Ossetian State University Named After Kosta Levanovich Khetagurov, Vatutina Str., 44-46, Vladikavkaz 362025, Russia.
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Abstract

Mineral springs of the Northern Caucasus remain largely uncharacterized by culture-independent approaches. At the high-altitude Dzhily-Su spring complex, where isotope data indicate deep-seated magmatic fluid inputs, planktonic and sediment-associated communities were analyzed using 16S rRNA gene profiling to determine whether these inputs shape the local microbiome. Rather than a distinct magmatically influenced community, the results revealed a pronounced water-sediment partitioning of taxa with known iron-cycling representatives, microaerophilic Gallionellaceae dominating the water fractions and facultatively anaerobic Aeromonas and Shewanella dominating the sediments. Furthermore, analysis of the fine-size (0.22 µm) water fraction highlighted a notable enrichment of candidate lineages and archaea, including a prominent Nanoarchaeota population (58.6% of archaeal reads) lacking identified mesophilic hosts. The predominance of a typical neutrophilic iron-cycling assemblage, together with the observed water-sediment partitioning, is consistent with an important role of local physicochemical gradients in structuring the microbial community despite the unusual geochemical setting of the parent aquifer.

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Cite

BibTeXRIS
BibTeX
@article{izotova2026watersediment,
  title = {{Water-Sediment Partitioning of a Neutrophilic Iron-Cycling Microbiome in the High-Altitude Dzhily-Su Mineral Springs (Mt. Elbrus).}},
  author = {Anna Olegovna Izotova and Anastasia Victorovna Komova and Lilia Zuberovna Zhinzhakova and Komila Ravshanovna Khazieva and Gennady Sozyrovich Kachmazov and Christina Vitalievna Chaika and Stepan Vladimirovich Toshchakov},
  journal = {International journal of molecular sciences},
  year = {2026},
  month = sep,
  doi = {10.3390/ijms27198549},
  url = {https://europepmc.org/article/MED/42883796},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Water-Sediment Partitioning of a Neutrophilic Iron-Cycling Microbiome in the High-Altitude Dzhily-Su Mineral Springs (Mt. Elbrus).
AU  - Anna Olegovna Izotova
AU  - Anastasia Victorovna Komova
AU  - Lilia Zuberovna Zhinzhakova
AU  - Komila Ravshanovna Khazieva
AU  - Gennady Sozyrovich Kachmazov
AU  - Christina Vitalievna Chaika
AU  - Stepan Vladimirovich Toshchakov
PY  - 2026
DA  - 2026/09/24
JO  - International journal of molecular sciences
DO  - 10.3390/ijms27198549
UR  - https://europepmc.org/article/MED/42883796
AB  - Mineral springs of the Northern Caucasus remain largely uncharacterized by culture-independent approaches. At the high-altitude Dzhily-Su spring complex, where isotope data indicate deep-seated magmatic fluid inputs, planktonic and sediment-associated communities were analyzed using 16S rRNA gene profiling to determine whether these inputs shape the local microbiome. Rather than a distinct magmatically influenced community, the results revealed a pronounced water-sediment partitioning of taxa with known iron-cycling representatives, microaerophilic Gallionellaceae dominating the water fractions and facultatively anaerobic Aeromonas and Shewanella dominating the sediments. Furthermore, analysis of the fine-size (0.22 µm) water fraction highlighted a notable enrichment of candidate lineages and archaea, including a prominent Nanoarchaeota population (58.6% of archaeal reads) lacking identified mesophilic hosts. The predominance of a typical neutrophilic iron-cycling assemblage, together with the observed water-sediment partitioning, is consistent with an important role of local physicochemical gradients in structuring the microbial community despite the unusual geochemical setting of the parent aquifer.
SN  - 1422-0067
ER  -