ArticlePloS one2013
Aphotic N2 fixation in the Eastern Tropical South Pacific Ocean.
Article in PloS one, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.
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Who cites it
27 citing papers in PubMed.
- Impact of diazotrophs on marine food webs and the biological carbon pump: progress and remaining challenges.The ISME journal · 2026Review
- Particle-associated NScience advances · 2025Article
- Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre.ISME communications · 2025Article
- Organic metabolite uptake by diazotrophs in the North Pacific Ocean.ISME communications · 2025Article
- Cold seep nitrogen fixation and its potential relationship with sulfur cycling.Microbiology spectrum · 2024Article
- Marine nitrogen-fixers in the Canadian Arctic Gateway are dominated by biogeographically distinct noncyanobacterial communities.FEMS microbiology ecology · 2023Article
- Non-cyanobacterial diazotrophs: global diversity, distribution, ecophysiology, and activity in marine waters.FEMS microbiology reviews · 2023Review
- Nitrogen fixation and diazotroph diversity in groundwater systems.The ISME journal · 2023Article
- Hydrodynamic regimes modulate nitrogen fixation and the mode of diazotrophy in Lake Tanganyika.Nature communications · 2023Article
- Prokaryote Distribution Patterns along a Dissolved Oxygen Gradient Section in the Tropical Pacific Ocean.Microorganisms · 2023Article
- Dark Diazotrophy during the Late Summer in Surface Waters of Chile Bay, West Antarctic Peninsula.Microorganisms · 2022Article
- Contribution of Heterotrophic Diazotrophs to NFrontiers in microbiology · 2022Article
- Community Interaction Co-limitation: Nutrient Limitation in a Marine Microbial Community Context.Frontiers in microbiology · 2022Article
- The bacterial sulfur cycle in expanding dysoxic and euxinic marine waters.Environmental microbiology · 2021Review
- Distinct Intra-lake Heterogeneity of Diazotrophs in a Deep Oligotrophic Mountain Lake.Microbial ecology · 2020Article
- Direct Detection of Heterotrophic Diazotrophs Associated with Planktonic Aggregates.Scientific reports · 2019Article
- Revisiting the distribution of oceanic NNature communications · 2019Article
- Article
- Article
- Global Marine NFrontiers in microbiology · 2018Review
Corrections and comments
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Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
We examined rates of N2 fixation from the surface to 2000 m depth in the Eastern Tropical South Pacific (ETSP) during El Niño (2010) and La Niña (2011). Replicated vertical profiles performed under oxygen-free conditions show that N2 fixation takes place both in euphotic and aphotic waters, with rates reaching 155 to 509 µmol N m(-2) d(-1) in 2010 and 24±14 to 118±87 µmol N m(-2) d(-1) in 2011. In the aphotic layers, volumetric N2 fixation rates were relatively low (<1.00 nmol N L(-1) d(-1)), but when integrated over the whole aphotic layer, they accounted for 87-90% of total rates (euphotic+aphotic) for the two cruises. Phylogenetic studies performed in microcosms experiments confirm the presence of diazotrophs in the deep waters of the Oxygen Minimum Zone (OMZ), which were comprised of non-cyanobacterial diazotrophs affiliated with nifH clusters 1K (predominantly comprised of α-proteobacteria), 1G (predominantly comprised of γ-proteobacteria), and 3 (sulfate reducing genera of the δ-proteobacteria and Clostridium spp., Vibrio spp.). Organic and inorganic nutrient addition bioassays revealed that amino acids significantly stimulated N2 fixation in the core of the OMZ at all stations tested and as did simple carbohydrates at stations located nearest the coast of Peru/Chile. The episodic supply of these substrates from upper layers are hypothesized to explain the observed variability of N2 fixation in the ETSP.
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