The Ammonia Oxidising Archaeon Nitrosopumilus maritimus Does Not Alter Iodine Oxidation State in Oxic Seawater
Alison L Webb1, Barbora Oudova-Rivera2, Martyn Ward1
1Wolfson Atmospheric Chemistry Laboratories, University of York, York, UK.
Abstract:
We investigate the potential for the globally distributed marine ammonia oxidising archaeon (AOA) Nitrosopumilus maritimus to oxidise iodide (I-), with the aim of identifying a key driver of seawater iodate (IO3 -) renewal. Batch cultures of N. maritimus grew well in concentrations of 0.1 to 1 mM NH4 + and from 0.0001 to 1 mM I-. There was near 100% conversion of ammonium to nitrite over an 8-day growth period. No loss of I- or production of IO3 - was detected in cultures where I- was added, indicating that N. maritimus is unable to drive I- oxidation under the tested conditions. This contrasts with previous observations of I- oxidation by ammonium oxidising bacteria (AOB). We explore whether differences between the metabolism of AOA and AOB could explain their differing actions on I-. N. maritimus cultures grown with the equivalent IO3 - concentrations also showed no reduction in [IO3 -]. In addition, the growth of the N. maritimus culture was unaffected by inorganic iodine concentrations over 1000 times higher than in ambient seawater, suggesting a resilience to high iodine. These results suggest that AOA might have very little role in inorganic iodine turnover in the global ocean.
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