Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL077132 |
Airborne Microbes Contribute to N-2 Fixation in Surface Water of the Northern Red Sea | |
Rahav, Eyal1; Paytan, Adina2; Mescioglu, Esra2; Galletti, Yuri3; Rosenfeld, Sahar1; Raveh, Ofrat1; Santinelli, Chiara3; Ho, Tung-Yuan4; Herut, Barak1 | |
2018-06-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:12页码:6186-6194 |
文章类型 | Article |
语种 | 英语 |
国家 | Israel; USA; Italy; Taiwan |
英文摘要 | Desert dust storms are frequent in the Northern Red Sea region, providing nutrients (i.e., PO4) and trace-metals (i.e., Fe) that may stimulate dinitrogen (N-2) fixation. Dust also carries a high diversity of airborne microbes (bacteria and archaea), including diazotrophs, that may remain viable during transport and upon deposition. Here we evaluate the impact of atmospheric deposition and its associated airborne diazotrophs on N-2 fixation in the surface water of the low-nutrient Northern Red Sea, using mesocosm bioassay experiments. We compared the chemical (nutritional) and sole airborne microbial impact of aerosol additions on N-2 fixation using live-dust (release nutrients/trace metals and viable airborne microorganisms) and UV-killed dust (release only chemicals). Airborne diazotrophy accounted for about one third of the measured N-2 fixation (0.350.06nmolNL(-1)day(-1) and 0.290.06nmolNL(-1)day(-1), for February 2017 and May 2017, live-dust additions, respectively). Two nifH sequences related to cluster III diazotrophs were amplified from the dust samples, consistent with the N-2 fixation measurement results. We postulate that the deposition of viable airborne diazotrophs may enhance N-2 fixation, especially in marine provinces subjected to high aerosol loads. We speculate that the relative contribution of airborne N-2 fixation may increase in the future with the predicted increase in dust deposition. Plain Language Summary Aerosols and dust are regularly transported across the oceans supplying nutrients and trace metals to the surface water. In addition, aerosols may also contain a wide array of different airborne microorganisms (heterotrophic bacteria, virus, cyanobacteria, and fungi) that can be easily transported for thousands of kilometers away from their place of origin within a few days. Here we examined the role of airborne N-2 fixers (diazotrophs) in the surface water of the low-nutrient Northern Red Sea during the summer. To this end, we compared the chemical (nutritional) and sole airborne microbial impact of aerosol additions on N-2 fixation using live-dust (release nutrients/trace metals and viable airborne microorganisms) and UV-killed dust (release only chemicals). Our results demonstrate that airborne N-2 fixation may be an important source of new bioavailable N in the Northern Red Sea, fueling primary production. In accordance with these measurements, two nifH sequences related to cluster III diazotrophs were amplified from the dust samples. Our results suggest that airborne N-2 fixation may play an important role in marine environments subjected to high aerosol loads. We further suggest that the role of airborne diazotrophs may likely increase in the future due to global desertification processes and thus an increase in dust deposition. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438499100041 |
WOS关键词 | OLIGOTROPHIC MEDITERRANEAN SEA ; NITROGEN-FIXATION ; DINITROGEN FIXATION ; ATMOSPHERIC DEPOSITION ; PRIMARY PRODUCTIVITY ; TRACE-METALS ; NIFH GENE ; DUST ; GULF ; PHOSPHORUS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27488 |
专题 | 气候变化 |
作者单位 | 1.Natl Inst Oceanog, Israel Oceanog & Limnol Res, Haifa, Israel; 2.Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USA; 3.CNR, Inst Biophys, Pisa, Italy; 4.Acad Sinica, Res Ctr Environm Changes, Taipei, Taiwan |
推荐引用方式 GB/T 7714 | Rahav, Eyal,Paytan, Adina,Mescioglu, Esra,et al. Airborne Microbes Contribute to N-2 Fixation in Surface Water of the Northern Red Sea[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(12):6186-6194. |
APA | Rahav, Eyal.,Paytan, Adina.,Mescioglu, Esra.,Galletti, Yuri.,Rosenfeld, Sahar.,...&Herut, Barak.(2018).Airborne Microbes Contribute to N-2 Fixation in Surface Water of the Northern Red Sea.GEOPHYSICAL RESEARCH LETTERS,45(12),6186-6194. |
MLA | Rahav, Eyal,et al."Airborne Microbes Contribute to N-2 Fixation in Surface Water of the Northern Red Sea".GEOPHYSICAL RESEARCH LETTERS 45.12(2018):6186-6194. |
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