Rapid biologically mediated oxygen isotope exchange between water and phosphate

food chain. Through these reactions the soft tissue d 18 Op values become 23–26% higher than d 18 Ow, and d 18 Op values of DIP become 20% higher than d 18 Ow. No correlation between d 18 Op values and either temperature or P concentrations in these experiments was observed. Our data imply that biogenic recycling and intracellular phosphorus turnover, which involves kinetic fractionation effects, are the major parameters controlling the d 18 Op values of P compounds dissolved in aquatic systems. This information is fundamental to any application of d 18 Op of dissolved organic or inorganic phosphate to quantify the dynamics of phosphorus cycling in aquatic systems. INDEX TERMS: 1615 Global Change: Biogeochemical processes (4805); 4825 Oceanography: Biological and Chemical: Geochemistry; 4845 Oceanography: Biological and Chemical: Nutrients and nutrient cycling; 4870 Oceanography: Biological and Chemical: Stable isotopes; KEYWORDS: phosphate, oxygen isotopes, nutrient cycling

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