气候变化领域集成服务门户(CCPortal): Nitrogen fixation and nitrogen gene abundance of METEOR cruises M77/3 and M77/4

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.833791
	Nitrogen fixation and nitrogen gene abundance of METEOR cruises M77/3 and M77/4
	Löscher; Carolin R; Großkopf; Tobias; Desai; Falguni; Gill; Diana; Schunck; Harald; Croot; Peter L; Schlosser; Christian; Neulinger; Sven C; Pinnow; Nicole; Lavik; Gaute; Kuypers; Marcel MM; LaRoche; Julie; Schmitz; Ruth A
发布日期	2014-07-04
数据集类型	dataset
英文简介	Nitrogen fixation, the biological reduction of dinitrogen gas (N2) to ammonium (NH4+), is quantitatively the most important external source of new nitrogen (N) to the open ocean. Classically, the ecological niche of oceanic N2 fixers (diazotrophs) is ascribed to tropical oligotrophic surface waters, often depleted in fixed N, with a diazotrophic community dominated by cyanobacteria. Although this applies for large areas of the ocean, biogeochemical models and phylogenetic studies suggest that the oceanic diazotrophic niche may be much broader than previously considered, resulting in major implications for the global N-budget. Here, we report on the composition, distribution and abundance of nifH, the functional gene marker for N2 fixation. Our results show the presence of eight clades of diazotrophs in the oxygen minimum zone (OMZ) off Peru. Although proteobacterial clades dominated overall, two clusters affiliated to spirochaeta and archaea were identified. N2 fixation was detected within OMZ waters and was stimulated by the addition of organic carbon sources supporting the view that non-phototrophic diazotrophs were actively fixing dinitrogen. The observed co-occurrence of key functional genes for N2 fixation, nitrification, anammox and denitrification suggests that a close spatial coupling of N-input and N-loss processes exists in the OMZ off Peru. The wide distribution of diazotrophs throughout the water column adds to the emerging view that the habitat of marine diazotrophs can be extended to low oxygen/high nitrate areas. Furthermore, our statistical analysis suggests that NO2- and PO43- are the major factors affecting diazotrophic distribution throughout the OMZ. In view of the predicted increase in ocean deoxygenation resulting from global warming, our findings indicate that the importance of OMZs as niches for N2 fixation may increase in the futur
空间范围	Median Latitude: -10.191287 * Median Longitude: -81.136285 * South-bound Latitude: -16.019000 * West-bound Longitude: -85.834167 * North-bound Latitude: 1.666660 * East-bound Longitude: -74.182800
时间范围	2008-12-28T23:35:00 - 2009-02-13T22:35:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215500
推荐引用方式 GB/T 7714	Löscher,Carolin R,Großkopf,et al. Nitrogen fixation and nitrogen gene abundance of METEOR cruises M77/3 and M77/4.2014-07-04.https://doi.org/10.1594/PANGAEA.833791.