Technical Comments

Comment on “The complex effects of ocean acidification on the prominent N2-fixing cyanobacterium Trichodesmium

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Science  15 Sep 2017:
Vol. 357, Issue 6356, eaao0067
DOI: 10.1126/science.aao0067

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Abstract

Hong et al. (Reports, 5 May 2017, p. 527) suggested that previous studies of the biogeochemically significant marine cyanobacterium Trichodesmium showing increased growth and nitrogen fixation at projected future high CO2 levels suffered from ammonia or copper toxicity. They reported that these rates instead decrease at high CO2 when contamination is alleviated. We present and discuss results of multiple published studies refuting this toxicity hypothesis.

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