Premium
Impact of ocean acidification on benthic and water column ammonia oxidation
Author(s) -
Kitidis Vassilis,
Laverock Bonnie,
McNeill Louise C.,
Beesley Amanda,
Cummings Denise,
Tait Karen,
Osborn Mark A.,
Widdicombe Stephen
Publication year - 2011
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2011gl049095
Subject(s) - water column , seawater , ocean acidification , benthic zone , environmental chemistry , oceanography , sediment , environmental science , ammonia , chemistry , geology , organic chemistry , paleontology
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 CO 2 ‐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 CO 2 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.