ArticleThe ISME journal2015
The effect of nutrients on carbon and nitrogen fixation by the UCYN-A-haptophyte symbiosis.
Article in The ISME journal, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 37 papers.
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Who cites it
37 citing papers in PubMed, 98 citations in OpenAlex.
- Branched-chain amino acid assimilation enables mixotrophy of ammonia-oxidizing archaeal sponge symbionts.Science advances · 2026Article
- Evaluation of nitrogen fixation in the marine purple photosynthetic bacterium Rhodovulum sulfidophilum under autotrophic and heterotrophic conditions.Scientific reports · 2025Article
- The protist community of the oligotrophic waters of the Gulf of Mexico is distinctly shaped by depth-specific physicochemical conditions during the warm season.FEMS microbiology ecology · 2025Article
- Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre.ISME communications · 2025Article
- Phagotrophy in the nitrogen-fixing haptophyte Braarudosphaera bigelowii.Environmental microbiology reports · 2024Article
- Microevolutionary patterns in ecotypes of the symbiotic cyanobacterium UCYN-A revealed from a Northwest Atlantic coastal time series.Science advances · 2023Article
- Symbiotic UCYN-A strains co-occurred with El Niño, relaxed upwelling, and varied eukaryotes over 10 years off Southern California.ISME communications · 2023Article
- Cell-specific measurements show nitrogen fixation by particle-attached putative non-cyanobacterial diazotrophs in the North Pacific Subtropical Gyre.Nature communications · 2022Article
- UCYN-A/haptophyte symbioses dominate NISME communications · 2021Article
- Purple sulfur bacteria fix NNature communications · 2021Article
- Light and depth dependency of nitrogen fixation by the non-photosynthetic, symbiotic cyanobacterium UCYN-A.Environmental microbiology · 2021Article
- Elucidation of trophic interactions in an unusual single-cell nitrogen-fixing symbiosis using metabolic modeling.PLoS computational biology · 2021Article
- Integrating Stochastic and Deterministic Process in the Biogeography of NFrontiers in microbiology · 2021Article
- Article
- Critical Role of Light in the Growth and Activity of the Marine NFrontiers in microbiology · 2021Article
- Calculation and Interpretation of Substrate Assimilation Rates in Microbial Cells Based on Isotopic Composition Data Obtained by nanoSIMS.Frontiers in microbiology · 2021Article
- Microbial Ecology of Oxygen Minimum Zones Amidst Ocean Deoxygenation.Frontiers in microbiology · 2021Review
- Unusual marine cyanobacteria/haptophyte symbiosis relies on NThe ISME journal · 2020Article
- New insights into the distributions of nitrogen fixation and diazotrophs revealed by high-resolution sensing and sampling methods.The ISME journal · 2020Article
- Heterogeneous nitrogen fixation rates confer energetic advantage and expanded ecological niche of unicellular diazotroph populations.Communications biology · 2020Article
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Authors and funding
6 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Symbiotic relationships between phytoplankton and N2-fixing microorganisms play a crucial role in marine ecosystems. The abundant and widespread unicellular cyanobacteria group A (UCYN-A) has recently been found to live symbiotically with a haptophyte. Here, we investigated the effect of nitrogen (N), phosphorus (P), iron (Fe) and Saharan dust additions on nitrogen (N2) fixation and primary production by the UCYN-A-haptophyte association in the subtropical eastern North Atlantic Ocean using nifH expression analysis and stable isotope incubations combined with single-cell measurements. N2 fixation by UCYN-A was stimulated by the addition of Fe and Saharan dust, although this was not reflected in the nifH expression. CO2 fixation by the haptophyte was stimulated by the addition of ammonium nitrate as well as Fe and Saharan dust. Intriguingly, the single-cell analysis using nanometer scale secondary ion mass spectrometry indicates that the increased CO2 fixation by the haptophyte in treatments without added fixed N is likely an indirect result of the positive effect of Fe and/or P on UCYN-A N2 fixation and the transfer of N2-derived N to the haptophyte. Our results reveal a direct linkage between the marine carbon and nitrogen cycles that is fuelled by the atmospheric deposition of dust. The comparison of single-cell rates suggests a tight coupling of nitrogen and carbon transfer that stays balanced even under changing nutrient regimes. However, it appears that the transfer of carbon from the haptophyte to UCYN-A requires a transfer of nitrogen from UCYN-A. This tight coupling indicates an obligate symbiosis of this globally important diazotrophic association.
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