Ocean acidification slows nitrogen fixation and growth in the dominant diazotroph Trichodesmium under low-iron conditions.

@article{Shi2012OceanAS,
  title={Ocean acidification slows nitrogen fixation and growth in the dominant diazotroph Trichodesmium under low-iron conditions.},
  author={Dalin Shi and Sven A Kranz and Ja-Myung Kim and François M M Morel},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2012},
  volume={109 45},
  pages={E3094-100}
}
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… CONTINUE READING
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