Volcanic ash inputs enhance the deep-sea seabed metal-biogeochemical cycle: A case study in the Yap Trench, western Pacific Ocean
Volcanic ash inputs enhance the deep-sea seabed metal-biogeochemical cycle: A case study in the Yap Trench, western Pacific Ocean
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火山灰输入增强深海海底金属生物地球化学循环：西太平洋雅浦海沟的案例研究
DOI：
10.1016/j.margeo.2020.106340
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发表时间：
2020-12
期刊：
影响因子：
2.9
通讯作者：
Peng Xiaotong
中科院分区：
文献类型：
--
作者：
Li Ling;Bai Shijie;Li Jiwei;Wang Shiming;Tang Limei;Dasgupta Shamik;Tang Yongjie;Peng Xiaotong
尽管火山灰沉积到海洋的现象在地质史的大部分时间里都很常见，但对深海海底金属-生物地球化学循环的潜在影响仍然是个谜。在这项研究中，我们分析了西太平洋雅浦海沟沉积岩芯中的矿物组成、微生物群落和与金属相关的功能基因。矿物学分析表明，火山活动为海沟海底沉积环境引入了大量的富铁火成岩矿物，如橄榄石、辉石、角闪石、凹凸棒石、黑云母等。此外，火山灰层中微生物群落也出现了一定的分化，潜在的铁代谢细菌(如假单胞菌、交错单胞菌、海洋杆菌、盐单胞菌、假交替单胞菌和红杆菌)在火山灰层中占主导地位。此外，与背景沉积物超基因组相比，火山灰超基因组中富含铁载体合成和摄取途径以及抗金属功能基因。这些结果表明，火山灰可以引起沟底质微生物群落的变化，并刺激微生物铁的获取和其他与金属有关的代谢。因此，微生物可以促进富含金属的火山矿物的分解和金属的释放，从而加强深海金属-生物地球化学循环。
Although volcanic ash deposition into oceans has been a frequent phenomenon for much of geologic history, the potential effects on deep-sea seabed metal-biogeochemical cycles remain enigmatic. In this study, we analyzed mineral compositions, microbial communities, and metal-related functional genes in a sediment core with volcanic ash layers from the Yap Trench in the western Pacific Ocean. The mineralogical analysis showed that volcanic activity introduced large amounts of Fe-rich igneous minerals, such as olivine, pyroxene, hornblende, grossularite, and biotite, into the trench seabed sedimentary environments. Furthermore, some differentiation in microbial communities was observed and potential Fe-metabolizing bacteria (such as Pseudomonas, Alteromonas, Marinobacter, Halomonas, Pseudoalteromonas, and Erythrobacter) were dominant in the volcanic ash layers. Moreover, compared with the background sediment metagenome, the volcanic ash metagenomes were enriched in pathways for siderophore synthesis and uptake, and metal resistant functional genes. These results suggest that volcanic ash can lead to changes in trench-sediment-based microbial communities and stimulate microbial Fe acquisition and other metal-related metabolism. In response, microorganisms could promote decomposition of the metal-rich volcanic minerals and metal release rates from them, subsequently enhancing the deep-sea metal-biogeochemical cycle.
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影响因子：
1.9
作者：
R. Denaro;F. Crisafi;Daniela Russo;M. Genovese;Enzo Messina;Lucrezia Genovese;M. Carbone;M. Ciavatta-M
通讯作者：
R. Denaro;F. Crisafi;Daniela Russo;M. Genovese;Enzo Messina;Lucrezia Genovese;M. Carbone;M. Ciavatta-M
影响因子：
5.1
作者：
Zane, Hannah K.;Butler, Alison
通讯作者：
Butler, Alison
影响因子：
3.7
作者：
R. Scudder;R. Murray;J. Schindlbeck;S. Kutterolf;F. Hauff;C. McKinley
通讯作者：
R. Scudder;R. Murray;J. Schindlbeck;S. Kutterolf;F. Hauff;C. McKinley
影响因子：
3.3
作者：
B. Song;C. Buckner;D. Hembury;R. Mills;M. Palmer
通讯作者：
B. Song;C. Buckner;D. Hembury;R. Mills;M. Palmer
影响因子：
5.8
作者：
B. Jicha;D. Scholl;D. Rea
通讯作者：
B. Jicha;D. Scholl;D. Rea