ArticleThe ISME journal2023
Ecophysiology and genomics of the brackish water adapted SAR11 subclade IIIa.
Article in The ISME journal, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.
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19 citing papers in PubMed.
- Third-generation RNA Amplicon Sequencing Reveals the Dynamics of Microbial Communities in the Tidal Reach of a Subtropical Estuary.Microbial ecology · 2026Article
- Defining metabolic niches for marine microbial heterotrophs.Science advances · 2026Article
- A hidden pattern? Common polyextremophilic microbial adaptations in Icy Moon analog environments.Frontiers in astronomy and space sciences · 2026Article
- Cell cycle dysregulation of globally important SAR11 bacteria resulting from environmental perturbation.Nature microbiology · 2026Article
- Seasonality drives temporal niche partitioning of pelagic prokaryotes.The ISME journal · 2026Article
- Impact of Submarine Groundwater Discharge on Microbial Communities in a Highly Anthropized Coastal Lagoon (Mar Menor, SE Spain).Molecular ecology · 2025Article
- Carotenoids bind rhodopsins and act as photocycle-accelerating pigments in marine Bacteroidota.Nature microbiology · 2025Article
- Culture-supported ecophysiology of the SAR116 clade demonstrates metabolic and spatial niche partitioning.The ISME journal · 2025Article
- Polyhydroxybutyrate production by freshwater SAR11 (LD12).The ISME journal · 2025Article
- SAR11 ecotypes across ocean basins change with depth due to changes in light and oxygen.The ISME journal · 2025Article
- From microscale to microbial insights: validating high-throughput microvolume extraction (HiMEx) methods for marine microbial ecology.ISME communications · 2025Article
- New isolates refine the ecophysiology of the Roseobacter CHAB-I-5 lineage.ISME communications · 2025Article
- Article
- Machine learning and metagenomics identifies uncharacterized taxa inferred to drive biogeochemical cycles in a subtropical hypereutrophic estuary.ISME communications · 2024Article
- Gradients of bacteria in the oceanic water column reveal finely-resolved vertical distributions.PloS one · 2024Article
- New chemical and microbial perspectives on vitamin B1 and vitamer dynamics of a coastal system.ISME communications · 2024Article
- Pelagic metagenome-assembled genomes from an estuarine salinity gradient in San Francisco Bay.Microbiology resource announcements · 2023Article
- The AEGEAN-169 clade of bacterioplankton is synonymous with SAR11 subclade V (HIMB59) and metabolically distinct.mSystems · 2023Article
- Large-scale phylogenomics of aquatic bacteria reveal molecular mechanisms for adaptation to salinity.Science advances · 2023Article
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8 authors.
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Abstract
The Order Pelagibacterales (SAR11) is the most abundant group of heterotrophic bacterioplankton in global oceans and comprises multiple subclades with unique spatiotemporal distributions. Subclade IIIa is the primary SAR11 group in brackish waters and shares a common ancestor with the dominant freshwater IIIb (LD12) subclade. Despite its dominance in brackish environments, subclade IIIa lacks systematic genomic or ecological studies. Here, we combine closed genomes from new IIIa isolates, new IIIa MAGS from San Francisco Bay (SFB), and 460 highly complete publicly available SAR11 genomes for the most comprehensive pangenomic study of subclade IIIa to date. Subclade IIIa represents a taxonomic family containing three genera (denoted as subgroups IIIa.1, IIIa.2, and IIIa.3) that had distinct ecological distributions related to salinity. The expansion of taxon selection within subclade IIIa also established previously noted metabolic differentiation in subclade IIIa compared to other SAR11 subclades such as glycine/serine prototrophy, mosaic glyoxylate shunt presence, and polyhydroxyalkanoate synthesis potential. Our analysis further shows metabolic flexibility among subgroups within IIIa. Additionally, we find that subclade IIIa.3 bridges the marine and freshwater clades based on its potential for compatible solute transport, iron utilization, and bicarbonate management potential. Pure culture experimentation validated differential salinity ranges in IIIa.1 and IIIa.3 and provided detailed IIIa cell size and volume data. This study is an important step forward for understanding the genomic, ecological, and physiological differentiation of subclade IIIa and the overall evolutionary history of SAR11.
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