Marine Nitrogen Dynamics and Ecosystem Interactions
Summary
Marine nitrogen dynamics encompass the complex cycle through which nitrogen is transformed and exchanged in the ocean, shaping primary productivity and ecosystem structure. At its heart lies the balance between biological nitrogen fixation and the removal processes of denitrification and anammox. Diazotrophic microorganisms convert inert atmospheric N₂ into bioavailable forms, supplying ‘new’ nitrogen that sustains phytoplankton growth in oligotrophic regions and fuels the biological carbon pump. Conversely, denitrification in water-column oxygen minimum zones and sediments returns fixed nitrogen to the atmosphere, acting as a major sink. Nitrification and microbial regeneration processes recycle nitrogen within the euphotic zone, influencing nutrient availability and species composition. Abiotic factors—light, temperature, trace metals such as iron, and phosphorus supply—control the rates of these transformations and the distribution of diazotrophs. Spatial patterns of coupling between nitrogen fixation and loss pathways can promote stability or trigger feedbacks that alter the global nitrogen inventory. These dynamics interact with higher trophic levels and carbon export processes, underpinning fisheries productivity, carbon sequestration and ecosystem resilience in the face of climatic perturbations.
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Marine Nitrogen Dynamics and Ecosystem Interactions publication trend
The graph below shows the total number of articles in marine nitrogen dynamics and ecosystem interactions across all publications each year (not limited to Nature Index journals).
Technical terms
Nitrogen fixation: Biological conversion of inert dinitrogen gas into bioavailable ammonia by specialised microorganisms.
Denitrification: Microbial reduction of nitrate to gaseous nitrogen species, returning fixed nitrogen to the atmosphere.
Diazotrophs: Microorganisms capable of fixing atmospheric nitrogen, including specific bacteria and cyanobacteria.
Euphotic zone: The upper ocean layer receiving sufficient light to support photosynthesis.
Primary production: Synthesis of organic matter by photosynthetic organisms, driven by nutrient and light availability.
New production: Portion of primary production sustained by external nutrient inputs, notably nitrogen fixation or upwelling.
References
- Revisiting the distribution and total amount of nitrogen fixation across the Kuroshio. Limnology and Oceanography Letters (2025).
- A Review of Ocean Color Algorithms to Detect Trichodesmium Oceanic Blooms and Quantify Chlorophyll Concentration in Shallow Coral Lagoons of South Pacific Archipelagos. Remote Sensing (2023).
- Dynamics of N2 fixation and fate of diazotroph-derived nitrogen in a low-nutrient, low-chlorophyll ecosystem: results from the VAHINE mesocosm experiment (New Caledonia). Biogeosciences (2016).
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