Impact of ocean acidification on benthic and water column ammonia oxidation
Impact of ocean acidification on benthic and water column ammonia oxidation
复制标题
DOI：
10.1029/2011gl049095
复制
发表时间：
2011-11-02
影响因子：
5.2
通讯作者：
Widdicombe, Stephen
中科院分区：
文献类型：
--
作者：
Kitidis, Vassilis;Laverock, Bonnie;Widdicombe, Stephen
氨氧化是海洋氮循环中的一个关键微生物过程。沉积物和水柱样品从两个对比网站在英吉利海峡（泥和沙）培养（长达14周）在CO（2）酸化海水pH值从8.0到pH值6.1。在伊斯基亚岛（地中海）外进行了额外的观察，这是一个天然的类似地点，在那里发生了长期的产热CO（2）沸腾（从pH 8.2到pH 7.6）。在低pH下，英吉利海峡样品中的水柱氨氧化速率下降，在pH 6.5时几乎完全抑制。水柱伊斯基亚样本显示了类似的趋势，但没有统计学意义。然而，沉积物氨氧化速率在所有三个位置没有受到pH值降低的影响。这些观察结果可以解释为沉积物内的缓冲或低pH值适应的微生物氨氧化群落。我们的观察结果对模拟海洋酸化对海洋生态系统的未来影响具有影响。引文：Kitidis，V.，B。拉弗洛克湖C.麦克尼尔，A. Beesley，D. Cummings，K. Tait，M. A.奥斯本和S. Widdicombe（2011年），海洋酸化对底栖生物和水柱氨氧化的影响，地球物理学。保留信函：38，L21603，doi：10.1029/2011GL049095。
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. Citation: Kitidis, V., B. Laverock, L. C. McNeill, A. Beesley, D. Cummings, K. Tait, M. A. Osborn, and S. Widdicombe (2011), Impact of ocean acidification on benthic and water column ammonia oxidation, Geophys. Res. Lett., 38, L21603, doi: 10.1029/2011GL049095.