Alkaline phosphatase activities in the central Atlantic Ocean indicate large areas with phosphorus deficiency

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Bacterial Extracellular Enzymatic Activity in Globally Changing Aquatic Ecosystems (2010, background): “Their activities can originate from bacterioplankton but also from phytoplankton and zooplankton [21].”
Zinc availability and alkaline phosphatase activity in Emiliania huxleyi: Implications for Zn‐P co‐limitation in the ocean (2006, background): “…and in the incubations is in agreement with other field studies (0–250 nmol MF-P [mg Chl a21], h21 [Guildford and Hecky 2000]; 10–300 nmol MF-P [mg Chl a21] h21 [Vidal et al. 2003]) and with our laboratory culture measurements (;30 nmol DiFMUP [mg Chl a21] h21, using 2 3 1025 mg Chl a cell21).”
Taxonomic variability of phosphorus stress in Sargasso Sea phytoplankton (2004, result): “Phytoplankton collected from the field displayed ELF-labeling patterns similar to those observed in cells from phosphorus-stressed cultures, supporting prior hypotheses of potential phosphorus stress in Atlantic subtropical gyres (e.g., Ammerman et al. 2003; Vidal et al. 2003).”
Nutrient limitation of picophytoplankton photosynthesis and growth in the tropical North Atlantic (2008, background): “With the N : P of the dissolved inorganic, dissolved organic and particulate pools exceeding the Redfield ratio of 16 mol N : 1 mol P (Ammerman et al. 2003; Vidal et al. 2003), it has been suggested that phosphate deficiency in the North Atlantic is an emerging paradigm (Ammerman et al. 2003).”