Response of the ammonia oxidation activity of microorganisms in surface sediment to a controlled sub-seabed release of CO2

Watanabe, Y, Tait, K, Gregory, S, Hayashi, M, Shimamoto, A, Taylor, P, Stahl, H, Green, K, Yoshinaga, I, Suwa, Y and Kita, J 2015 Response of the ammonia oxidation activity of microorganisms in surface sediment to a controlled sub-seabed release of CO2. International Journal of Greenhouse Gas Control, 38. 162-170. https://doi.org/10.1016/j.ijggc.2014.11.013

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Abstract/Summary

The impact of a sub-seabed CO2 leak from geological sequestration on the microbial process of ammonia oxidation was investigated in the field. Sediment samples were taken before, during and after a controlled sub-seabed CO2 leak at four zones differing in proximity to the CO2 source (epicentre, and 25m, 75m, and 450m distant). The impact of CO2 release on benthic microbial ATP levels was compared to ammonia oxidation rates and the abundance of bacterial and archaeal ammonia amoA genes and transcripts, and also to the abundance of nitrite oxidize (nirS) and anammox hydrazine oxidoreductase (hzo) genes and transcripts. The major factor influencing measurements was seasonal: only minor differences were detected at the zones impacted by CO2 (epicentre and 25m distant). This included a small increase to ammonia oxidation after 37daysof CO2 release which was linked to an increase in ammonia availability as a result of mineral dissolution. A CO2 leak on the scale used within this study (<1tonneday−1) would have very little impact to ammonia oxidation within coastal sediments. However, seawater containing 5% CO2 did reduce rates of ammonia oxidation. This was linked to the buffering capacity of the sediment, suggesting that the impact of a sub-seabed leak of stored CO2 on ammonia oxidation would be dependent on both the scale of the CO2 release and sediment type.

Item Type:	Publication - Article
Additional Keywords:	CO2 leakage Marine sediment Ammonia oxidation ATP amoA hzo
Subjects:	Chemistry Ecology and Environment Marine Sciences
Divisions:	Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity
Depositing User:	Mrs Julia Crocker
Date made live:	09 Jul 2015 10:44
Last Modified:	06 Jun 2017 16:13
URI:	https://plymsea.ac.uk/id/eprint/6440

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