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Methodological Underestimation of Oceanic Nitrogen Fixation Rates
TLDR
It is demonstrated that the 15N2-tracer addition method underestimates N2 fixation rates significantly when the15N2 tracer is introduced as a gas bubble, and proposed and tested a modified 15N 2 tracer method based on the addition of 15N1-enriched seawater that provides an instantaneous, constant enrichment and allows more accurate calculation of N2fixation rates for both field and laboratory studies.
Doubling of marine dinitrogen-fixation rates based on direct measurements
TLDR
If the findings can be extrapolated to other ocean basins, this suggests that the global marine N2-fixation rate derived from direct measurements may increase from 103 ± 8 Tg N yr−1 to 177‬±‬8‬‬2, and that the contribution of N2 fixers other than Trichodesmium is much more significant than was previously thought.
Facets of diazotrophy in the oxygen minimum zone waters off Peru
TLDR
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, indicating that the importance of OMZs as niches for N 2 fixation may increase in the future.
Giant Hydrogen Sulfide Plume in the Oxygen Minimum Zone off Peru Supports Chemolithoautotrophy
TLDR
The results suggest that the chemolithoautotrophic bacteria utilized several oxidants to detoxify the sulfidic waters well below the oxic surface, and may be involved in a negative feedback loop that could fuel further sulfate reduction and potentially stabilize the sulphidic OMZ waters.
Factors affecting the abundance of phytoplankton in a restricted subtropical lagoon
Phytoplankton dynamics in the Indian River Lagoon was examined from the point of view of several key controlling factors, including: nutrient limitation, light availability, temperature, wind,
Widespread Distribution and Expression of Gamma A (UMB), an Uncultured, Diazotrophic, γ-Proteobacterial nifH Phylotype
TLDR
A phylogenetic analysis of all nifH γ-proteobacterial sequences available in public databases and qPCR data of a γ/nifH phylotype, Gamma A, obtained during several research cruises revealed a complex diversity of diazotrophicγ- Proteobacteria.
Synthetic microbial communities☆
TLDR
This work has shown that synthetic microbial communities are comprehensible systems of reduced complexity that keep key features of natural ones and are amenable to modelling.
Direct and Indirect Costs of Dinitrogen Fixation in Crocosphaera watsonii WH8501 and Possible Implications for the Nitrogen Cycle
TLDR
The results imply the existence of a niche for diazotrophic organisms inside oxygen minimum zones, which are predicted to further expand in the future ocean.
Metabolic modelling in a dynamic evolutionary framework predicts adaptive diversification of bacteria in a long-term evolution experiment
TLDR
The evoFBA framework represents a promising new way to model biochemical evolution, one that can generate testable predictions about evolutionary and ecosystem-level outcomes.
A stable genetic polymorphism underpinning microbial syntrophy
TLDR
This work shows that the syntrophic sulfate-reducing species Desulfovibrio vulgaris displays a stable genetic polymorphism, where only a specific genotype is able to engage in syntrophy with the hydrogenotrophic methanogen Methanococcus maripaludis.
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