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September 14, 2017

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

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.

by Hutchins, D. A., Fu, F., Walworth, N. G., Lee, M. D., Saito, M. A., Webb, E. A. at September 14, 2017 05:23 PM

Response to Comment on "The complex effects of ocean acidification on the prominent N2-fixing cyanobacterium Trichodesmium"

Hutchins et al. question the validity of our results showing that under fast growth conditions, the beneficial effect of high CO2 on Trichodesmium is overwhelmed by the deleterious effect of the concomitant decrease in ambient and cellular pH. The positive effect of acidification reported by Hutchins and co-workers is likely caused by culture conditions that support suboptimal growth rates.

by Shi, D., Shen, R., Kranz, S. A., Morel, F. M. M., Hong, H. at September 14, 2017 05:23 PM