GSTDTAP  > 地球科学
DOI10.1073/pnas.1619844114
Cryptic oxygen cycling in anoxic marine zones
Garcia-Robledo, Emilio1,7; Padilla, Cory C.2; Aldunate, Montserrat3,4; Stewart, Frank J.2; Ulloa, Osvaldo4; Paulmier, Aurelien5; Gregori, Gerald6; Revsbech, Niels Peter1
2017-08-01
发表期刊PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
出版年2017
卷号114期号:31页码:8319-8324
文章类型Article
语种英语
国家Denmark; USA; Chile; France; Spain
英文摘要

Oxygen availability drives changes in microbial diversity and biogeochemical cycling between the aerobic surface layer and the anaerobic core in nitrite-rich anoxic marine zones (AMZs), which constitute huge oxygen-depleted regions in the tropical oceans. The current paradigm is that primary production and nitrification within the oxic surface layer fuel anaerobic processes in the anoxic core of AMZs, where 30-50% of global marine nitrogen loss takes place. Here we demonstrate that oxygenic photosynthesis in the secondary chlorophyll maximum (SCM) releases significant amounts of O-2 to the otherwise anoxic environment. The SCM, commonly found within AMZs, was dominated by the picocyanobacteria Prochlorococcus spp. Free O-2 levels in this layer were, however, undetectable by conventional techniques, reflecting a tight coupling between O-2 production and consumption by aerobic processes under apparent anoxic conditions. Transcriptomic analysis of the microbial community in the seemingly anoxic SCM revealed the enhanced expression of genes for aerobic processes, such as nitrite oxidation. The rates of gross O-2 production and carbon fixation in the SCM were found to be similar to those reported for nitrite oxidation, as well as for anaerobic dissimilatory nitrate reduction and sulfate reduction, suggesting a significant effect of local oxygenic photosynthesis on Pacific AMZ biogeochemical cycling.


英文关键词Prochlorococcus oxygen minimum zone secondary chlorophyll maximum metatranscriptomics aerobic metabolism
领域地球科学 ; 气候变化 ; 资源环境
收录类别SCI-E
WOS记录号WOS:000406653300061
WOS关键词EASTERN TROPICAL PACIFIC ; MINIMUM-ZONE ; SOUTH-PACIFIC ; NITROGEN LOSS ; ARABIAN SEA ; PROCHLOROCOCCUS ; BACTERIA ; OCEAN ; PHOTOSYNTHESIS ; SEQUENCES
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/204760
专题地球科学
资源环境科学
气候变化
作者单位1.Aarhus Univ, Microbiol Sect, Dept Biosci, DK-8000 Aarhus, Denmark;
2.Georgia Inst Technol, Sch Biol Sci, Atlanta, GA 30332 USA;
3.Univ Concepcion, Dept Oceanog, Grad Program Oceanog, Concepcion 4070386, Chile;
4.Univ Concepcion, Inst Milenio Oceanog, Dept Oceanog, Concepcion 4070386, Chile;
5.Univ Toulouse, Lab Etud Geophys & Oceanog Spatiales, Inst Rech Dev, CNRS,Ctr Natl Etud Spatiales, F-31400 Toulouse, France;
6.Univ Toulon & Var, Aix Marseille Univ, Mediterranean Inst Oceanog, CNRS,Inst Rech & Dev,UM 110, F-13288 Marseille, France;
7.Univ Cadiz, Dept Biol, Ecol Sect, Cadiz 11510, Spain
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Garcia-Robledo, Emilio,Padilla, Cory C.,Aldunate, Montserrat,et al. Cryptic oxygen cycling in anoxic marine zones[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(31):8319-8324.
APA Garcia-Robledo, Emilio.,Padilla, Cory C..,Aldunate, Montserrat.,Stewart, Frank J..,Ulloa, Osvaldo.,...&Revsbech, Niels Peter.(2017).Cryptic oxygen cycling in anoxic marine zones.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(31),8319-8324.
MLA Garcia-Robledo, Emilio,et al."Cryptic oxygen cycling in anoxic marine zones".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.31(2017):8319-8324.
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