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<p><a href="page.php?w=phosphate">phosphate</a>, or <a href="page.php?w=silicic_acid">silicic acid</a>, which are required in relatively large quantities for growth. Their availability in the surface ocean is governed by the balance between the so-called <a href="page.php?w=biological_pump">biological pump</a> and <a href="page.php?w=upwelling">upwelling</a> of deep, nutrient-rich waters. The <a href="page.php?w=stoichiometry">stoichiometric</a> nutrient composition of phytoplankton drives -- and is driven by -- the <a href="page.php?w=Redfield_ratio">Redfield ratio</a></p><p>
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