Impact of volcanic ash on anammox communities in deep sea sediments.
Impact of volcanic ash on anammox communities in deep sea sediments.
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DOI：
10.1111/1758-2229.12137
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发表时间：
2014-04
影响因子：
3.3
通讯作者：
B. Song;C. Buckner;D. Hembury;R. Mills;M. Palmer
中科院分区：
文献类型：
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作者：
B. Song;C. Buckner;D. Hembury;R. Mills;M. Palmer
空中喷发火山作用为海洋提供了大量物质，但人们对火山灰对沉积微生物活动的影响知之甚少。我们研究了小安的列斯群岛火山活跃的蒙特塞拉特岛附近深海沉积物中的anammox群落。通过(15)N同位素配对培养实验测定沉积物中厌氧氨氧化和反硝化的速率，同时利用16S rRNA基因检测厌氧氨氧化群落结构。表层沉积物中火山灰含量较低的沉积物厌氧氨氧化速率较高，而火山灰含量最高的沉积物中厌氧氨氧化活性最低。16S rRNA基因分析揭示了‘Candidatus Scaldua sp.’的存在。在沉积物中。在灰分沉积最高的沉积物中，厌氧氨氧化细菌多样性最低。总体而言，这项研究表明，深海沉积物中火山物质的沉积对Anammox群落的活动和多样性有负面影响。由于厌氧氨氧化可能占海洋生态系统氮气产量的79%，地球历史上广泛的火山爆发时期可能对沉积脱氮过程产生了迄今未被认识到的负面影响。
Subaerial explosive volcanism contributes substantial amounts of material to the oceans, but little is known about the impact of volcanic ash on sedimentary microbial activity. We have studied anammox communities in deep sea sediments near the volcanically active island of Montserrat, Lesser Antilles. The rates of anammox and denitrification in the sediments were measured using (15)N isotope pairing incubation experiments, while 16S rRNA genes were used to examine anammox community structures. The higher anammox rates were measured in sediment containing the lower accumulation of volcanic ash in the surface sediments, while the lowest activities were found in sediments with the highest ash deposit. 16S rRNA gene analysis revealed the presence of 'Candidatus Scalindua spp.' in the sediments. The lowest diversity of anammox bacteria was observed in the sediments with the highest ash deposit. Overall, this study demonstrates that the deposition of volcanic material in deep sea sediments has negative impacts on activity and diversity of the anammox community. Since anammox may account for up to 79% of N2 production in marine ecosystems, periods of extensive explosive volcanism in Earth history may have had a hitherto unrecognized negative impact on the sedimentary nitrogen removal processes.