Agricultural runoff fuels large phytoplankton blooms in vulnerable areas of the ocean

@article{Beman2005AgriculturalRF,
  title={Agricultural runoff fuels large phytoplankton blooms in vulnerable areas of the ocean},
  author={J. Michael Beman and Kevin R. Arrigo and Pamela A. Matson},
  journal={Nature},
  year={2005},
  volume={434},
  pages={211-214}
}
Biological productivity in most of the world's oceans is controlled by the supply of nutrients to surface waters. The relative balance between supply and removal of nutrients—including nitrogen, iron and phosphorus—determines which nutrient limits phytoplankton growth. Although nitrogen limits productivity in much of the ocean, large portions of the tropics and subtropics are defined by extreme nitrogen depletion. In these regions, microbial denitrification removes biologically available forms… 
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References

SHOWING 1-10 OF 39 REFERENCES
Nitrogen cycling and anthropogenic impact in the tropical interamerican seas
We discuss the mechanisms leading to nutrient limitation in tropical marine systems, with particular emphasis on nitrogen cycling in Caribbean ecosystems. We then explore how accelerated nutrient
Patterns and controls of nitrous oxide emissions from waters draining a subtropical agricultural valley
Although nitrous oxide (N2O) emission from agricultural runoff is thought to constitute a globally important source of this greenhouse gas, N2O flux from polluted aquatic systems is poorly understood
Nitrogen limitation in the tropical waters of the Bay of Bengal
A 3 year study (1986–1989) was carried out in the Bay of Bengal off Madras in order to understand the influence of physical and chemical variables on the occurrence, abundance and productivity of its
Iron and phosphorus co-limit nitrogen fixation in the eastern tropical North Atlantic
TLDR
The results support the hypothesis that aeolian mineral dust deposition promotes nitrogen fixation in the eastern tropical North Atlantic and show that community primary productivity was nitrogen-limited, and that nitrogen fixation was co-limited by iron and phosphorus.
Denitrification and N2 fixation in the Pacific Ocean
We establish the fixed nitrogen budget of the Pacific Ocean based on nutrient fields from the recently completed World Ocean Circulation Experiment (WOCE). The budget includes denitrification in the
Global patterns of marine nitrogen fixation and denitrification
A new quasi‐conservative tracer N*, defined as a linear combination of nitrate and phosphate, is proposed to investigate the distribution of nitrogen fixation and denitrification in the world oceans.
Mapping nitrate in the global ocean using remotely sensed sea surface temperature
[1] Nitrogen is the most broadly limiting factor for marine phytoplankton on ecological timescales. Nitrate, as the most oxidized inorganic species, plays a significant role in nitrogen availability
Spatial variability of the photosynthetic parameters and biomass of the Gulf of California phytoplankton
TLDR
It is proposed that it is possible to estimate late- fall PP for the CGC using average photosynthetic parameters, because the major source of variability for primary productivity comes from Chl, and not from PBm and aB.
Geochemical evidence of denitrification in the Benguela upwelling system
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