ArticleScientific reports2019
Active nitrogen fixation by Crocosphaera expands their niche despite the presence of ammonium - A case study.
Article in Scientific reports, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed, 17 citations in OpenAlex.
- Metabolic biochemical models of NmSystems · 2025Article
- Phosphorus limitation heightens vulnerability ofFrontiers in microbiology · 2025Article
- Excessive Extracellular Ammonium Production by a Free-Living Nitrogen-Fixing SoilMicroorganisms · 2024Article
- High Growth Rate of Diatoms Explained by Reduced Carbon Requirement and Low Energy Cost of Silica Deposition.Microbiology spectrum · 2023Article
- A diazotrophy-ammoniotrophy dual growth model for the sulfate reducing bacteriumComputational and structural biotechnology journal · 2023Article
- Article
- Modeling the elemental stoichiometry and silicon accumulation in diatoms.Current research in microbial sciences · 2022Article
- QuantifyingComputational and structural biotechnology journal · 2021Article
- Carbon Transfer from the Host Diatom Enables Fast Growth and High Rate of NPlants (Basel, Switzerland) · 2020Article
- Quantitative models of nitrogen-fixing organisms.Computational and structural biotechnology journal · 2020Review
- Heterocyst-infecting chytrid parasites reduce nitrogen fixation and host growth under nitrogen-limiting conditions in the cyanobacteriumJournal of plankton researchArticle
Corrections and comments
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Authors and funding
3 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Unicellular nitrogen fixer Crocosphaera contributes substantially to nitrogen fixation in oligotrophic subtropical gyres. They fix nitrogen even when significant amounts of ammonium are available. This has been puzzling since fixing nitrogen is energetically inefficient compared with using available ammonium. Here we show that by fixing nitrogen, Crocosphaera can increase their population and expand their niche despite the presence of ammonium. We have developed a simple but mechanistic model of Crocosphaera based on their growth in steady state culture. The model shows that the growth of Crocosphaera can become nitrogen limited despite their capability to fix nitrogen. When they fix nitrogen, the population increases by up to 78% relative to the case without nitrogen fixation. When we simulate a simple ecological situation where Crocosphaera exists with non-nitrogen-fixing phytoplankton, the relative abundance of Crocosphaera increases with nitrogen fixation, while the population of non-nitrogen-fixing phytoplankton decreases since a larger fraction of fixed nitrogen is consumed by Crocosphaera. Our study quantitatively supports the benefit of nitrogen fixation despite the high electron/energy costs, even when an energetically efficient alternative is available. It demonstrates a competitive aspect of Crocosphaera, permitting them to be regionally significant nitrogen fixers.
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