Phosphorus is a critical nutrient for survival of photoautotrophs, including zooxanthellae. In recirculating systems densely-populated with zooxanthellate cnidarians and bivalves, and/or in which algae are utilized as a means of natural nutrient reduction, phosphorus may become a biolimiting nutrient, slowing or halting primary productivity and cohort growth until the concentration is increased; extreme deficiency may result in bleaching.
RB_Phosph8
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