ArticleProceedings of the National Academy of Sciences of the United States of America2012
Ocean acidification slows nitrogen fixation and growth in the dominant diazotroph Trichodesmium under low-iron conditions.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 34 papers.
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34 citing papers in PubMed, 126 citations in OpenAlex.
- Reduced NNature communications · 2026Article
- Ventilation and buffering capacity effects on ocean acidification in low oxygen environments.Nature communications · 2025Article
- Modeling dynamic oxygen permeability as a mechanism to mitigate oxygen-induced stresses on photosynthesis and NMicrobiology spectrum · 2025Article
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- Eukaryotic phytoplankton drive a decrease in primary production in response to elevated COProceedings of the National Academy of Sciences of the United States of America · 2025Article
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- Deoxygenation enhances photosynthetic performance and increases NFrontiers in microbiology · 2023Article
- Diurnally dynamic iron allocation promotes NComputational and structural biotechnology journal · 2023Article
- NmSystems · 2022Article
- Symbioses of Cyanobacteria in Marine Environments: Ecological Insights and Biotechnological Perspectives.Marine drugs · 2021Review
- Electron & Biomass Dynamics ofFrontiers in microbiology · 2021Article
- Proteomic responses to ocean acidification of the marine diazotroph Trichodesmium under iron-replete and iron-limited conditions.Photosynthesis research · 2019Article
- Iron requirements and uptake strategies of the globally abundant marine ammonia-oxidising archaeon, Nitrosopumilus maritimus SCM1.The ISME journal · 2019Article
- Reduced nitrogenase efficiency dominates response of the globally important nitrogen fixer Trichodesmium to ocean acidification.Nature communications · 2019Article
- Solar UV radiation in a changing world: roles of cryosphere-land-water-atmosphere interfaces in global biogeochemical cycles.Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology · 2019Article
- Environmental effects of ozone depletion, UV radiation and interactions with climate change: UNEP Environmental Effects Assessment Panel, update 2017.Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology · 2018Article
- Nutrient-Colimited Trichodesmium as a Nitrogen Source or Sink in a Future Ocean.Applied and environmental microbiology · 2018Article
- An Integrated Response ofFrontiers in microbiology · 2018Article
- The influence of abrupt increases in seawater pCO2 on plankton productivity in the subtropical North Pacific Ocean.PloS one · 2018Article
- Assessing the effects of iron enrichment across holobiont compartments reveals reduced microbial nitrogen fixation in the Red Sea coralEcology and evolution · 2017Article
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Authors and funding
4 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Dissolution of anthropogenic CO(2) increases the partial pressure of CO(2) (pCO(2)) and decreases the pH of seawater. The rate of Fe uptake by the dominant N(2)-fixing cyanobacterium Trichodesmium declines as pH decreases in metal-buffered medium. The slower Fe-uptake rate at low pH results from changes in Fe chemistry and not from a physiological response of the organism. Contrary to previous observations in nutrient-replete media, increasing pCO(2)/decreasing pH causes a decrease in the rates of N(2) fixation and growth in Trichodesmium under low-Fe conditions. This result was obtained even though the bioavailability of Fe was maintained at a constant level by increasing the total Fe concentration at low pH. Short-term experiments in which pCO(2) and pH were varied independently showed that the decrease in N(2) fixation is caused by decreasing pH rather than by increasing pCO(2) and corresponds to a lower efficiency of the nitrogenase enzyme. To compensate partially for the loss of N(2) fixation efficiency at low pH, Trichodesmium synthesizes additional nitrogenase. This increase comes partly at the cost of down-regulation of Fe-containing photosynthetic proteins. Our results show that although increasing pCO(2) often is beneficial to photosynthetic marine organisms, the concurrent decreasing pH can affect primary producers negatively. Such negative effects can occur both through chemical mechanisms, such as the bioavailability of key nutrients like Fe, and through biological mechanisms, as shown by the decrease in N(2) fixation in Fe-limited Trichodesmium.
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