Iron deficiency limits phytoplankton growth in the north-east Pacific subarctic

  title={Iron deficiency limits phytoplankton growth in the north-east Pacific subarctic},
  author={John H. Martin and Steve E. Fitzwater},
An interesting oceanographic problem concerns the excess major plant nutrients (PO4, NO3, SiO3) occurring in offshore surface waters of the Antarctic1–3 and north-east Pacific subarctic Oceans4. In a previous study5, we presented indirect evidence suggesting that inadequate Fe input was responsible for this limitation of growth; recently we had the opportunity to seek direct evidence for this hypothesis in the north-east Pacific subarctic. We report here that the addition of nmol amounts of… 
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