Impact of ocean acidification on benthic and water column ammonia oxidation

Kitidis, Vassilis and Laverock, Bonnie and McNeill, Louise C. and Beesley, Amanda and Cummings, Denise and Tait, Karen and Osborn, Mark A. and Widdicombe, Stephen (2011) Impact of ocean acidification on benthic and water column ammonia oxidation. Geophysical Research Letters, 38 (21). pp. 21603-21607. ISSN 0094-8276

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Full text URL: http://dx.doi.org/10.1029/2011GL049095

Abstract

Ammonia oxidation is a key microbial process within the marine N-cycle. Sediment and water column samples from two contrasting sites in the English Channel (mud and sand) were incubated (up to 14 weeks) in CO2-acidified seawater ranging from pH 8.0 to pH 6.1. Additional observations were made off the island of Ischia (Mediterranean Sea), a natural analogue site, where long-term thermogenic CO2 ebullition occurs (from pH 8.2 to pH 7.6). Water column ammonia oxidation rates in English Channel samples decreased under low pH with near-complete inhibition at pH 6.5. Water column Ischia samples showed a similar though not statistically significant trend. However, sediment ammonia oxidation rates at all three locations were not affected by reduced pH. These observations may be explained by buffering within sediments or low-pH adaptation of the microbial ammonia oxidizing communities. Our observations have implications for modeling the future impact of ocean acidification on marine ecosystems.

Item Type:Article
Keywords:N-cycling, nitrification, ocean acidification, sediment
Subjects:C Biological Sciences > C180 Ecology
F Physical Sciences > F700 Ocean Sciences
Divisions:College of Science > School of Life Sciences
ID Code:6736
Deposited By:INVALID USER
Deposited On:31 Oct 2012 17:44
Last Modified:04 Dec 2013 21:30

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