DOI: 10.1038/s41561-020-00651-7
论文题名: Biological nitrogen fixation detected under Antarctic sea ice
作者: Shiozaki T. ; Fujiwara A. ; Inomura K. ; Hirose Y. ; Hashihama F. ; Harada N.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 11 起始页码: 729
结束页码: 732
语种: 英语
英文关键词: biological analysis
; cyanobacterium
; detection method
; ecological modeling
; gene expression
; global ocean
; keystone species
; nitrogen fixation
; sea ice
; Southern Ocean
英文摘要: Nitrogen fixation is the primary source of reactive nitrogen in the ocean. Most ecological models do not predict nitrogen fixation in the Antarctic Ocean because of the low availability of iron and high abundance of nitrogen. Here we extensively examined nitrogen fixation in the Antarctic Ocean, and found substantial nitrogen fixation (maximum: 44.4 nmol N l−1 d−1) near the Antarctic coast, especially around ice-covered regions. The nitrogenase gene (nifH) was detected at all coastal stations, including stations where no nitrogen fixation was found. At the stations where nitrogen fixation was detected, the nitrogen-fixing cyanobacterium UCYN-A (Candidatus ‘Atelocyanobacterium thalassa’) dominated nifH gene expression, and the nifH sequence was identical to that of the major oligotype in tropical and subtropical oceans. Our results suggest that marine nitrogen fixation is a ubiquitous process in the global ocean, and that UCYN-A is the keystone species for making it possible. © 2020, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169679
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan; Earth Surface System Research Center, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; Institute of Arctic Climate and Environment Research, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; School of Oceanography, University of Washington, Seattle, WA, United States; Department of Applied Chemistry and Life Science, Toyohashi University of Technology, Toyohashi, Japan; Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Minato-ku, Tokyo, Japan
Recommended Citation:
Shiozaki T.,Fujiwara A.,Inomura K.,et al. Biological nitrogen fixation detected under Antarctic sea ice[J]. Nature Geoscience,2020-01-01,13(11)