oligotrophic

Edge evidence

• low nutrient concentration selects for oligotrophic METPO:2007401

  Oligotrophs grow optimally at low nutrient concentrations.

  • DOI:10.1073/pnas.0903507106 low (oligotrophic) nutrient concentrations Supports low nutrient concentration as the defining environmental context.
• nutrient limitation favors streamlined genome

  Nutrient limitation favors streamlined genomic and cellular architecture.

  • DOI:10.1038/ismej.2014.60 selection for efficient use of nutrients Supports streamlining as an adaptation under nutrient limitation.
• streamlined genome contributes to efficient nutrient use RO:0002326

  Streamlined genomes reduce resource requirements for cell replication.

  • DOI:10.1038/ismej.2014.60 minimizes resources required for replication Supports genome streamlining as a resource-efficiency mechanism.
• small cell architecture contributes to efficient nutrient use RO:0002326

  Small cells reduce resource demand in oligotrophic habitats.

  • DOI:10.1038/ismej.2014.60 small cells and genomes Supports small-cell architecture as part of streamlining theory.
• oligotrophic associated with slow growth biolink:associated_with

  Oligotrophs are often slow-growing under apparently favorable conditions.

  • DOI:10.1002/bies.1091 grow slowly under apparent optimal conditions Supports slow growth as a characteristic of oligotrophic strategy.
• efficient nutrient use enables oligotrophic RO:0002327

  Efficient nutrient use enables persistence and growth in nutrient-poor environments.

  • DOI:10.1073/pnas.0903507106 molecular mechanisms of adaptation Supports genomic mechanisms underlying oligotrophic adaptation.
• low nutrient concentration selects for streamlined genome METPO:2007401

  Low nutrient availability is a strong selective force driving genome streamlining and low GC content.

  • DOI:10.1038/s41467-023-36988-x Nutrient limitation is considered a strong selective force causing genome streamlining in the warm oligotrophic epipelagic ocean (Ngugi et al. 2023).
• low nutrient concentration favors high-affinity solute-binding proteins

  Oligotrophic conditions favor reliance on extremely high-affinity solute-binding proteins.

  • DOI:10.1038/s41586-024-07924-w Marine bacteria rely heavily on solute-binding proteins with extremely high (picomolar-low nanomolar) binding affinity (Clifton et al. 2024).
• high-affinity solute-binding proteins increases substrate uptake at low concentration RO:0002213

  High-affinity SBPs increase substrate uptake at picomolar-nanomolar concentrations matching ambient levels.

  • DOI:10.1038/s41586-024-07924-w SBP affinities match observed environmental substrate concentrations (picomolar-low nanomolar), enabling uptake at ambient levels (Clifton et al. 2024).
• streamlined genome reduces reduced metabolic redundancy METPO:2000017

  Genome streamlining removes non-essential genes and metabolic redundancy.

  • DOI:10.1038/s41586-024-07924-w Oligotrophic adaptation includes extreme genome streamlining with removal of non-essential genes (Clifton et al. 2024).
• oligotrophic associated with small cell volume biolink:associated_with

  Oligotrophs have very small cell volumes (~0.1 um3) as a recurrent hallmark.

  • DOI:10.1038/s41467-024-48591-9 Oligotrophs have very small cell volumes (~0.1 um3) (Zhu & Dai 2024).