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Variability of inorganic and organic phosphorus turnover rates in the coastal ocean

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Abstract

Phosphorus is an essential nutrient in pelagic marine ecosystems. Phosphorus cycling in the upper ocean is, however, poorly understood, and few studies have directly investigated the biological utilization of this essential element1,2,3,4. Here, we have determined in situ phosphorus-turnover rates in a coastal marine environment by measuring the activities of two cosmogenic radionuclides (32P and 33P, with half lives of 14.3 and 25.3 days, respectively) in dissolved inorganic, dissolved organic and total particulate phosphorus pools over a seasonal cycle. Phosphorus turnover rates within dissolved and particulate pools are rapid and vary over seasonal timescales, suggesting that low phosphorus concentrations can support relatively high primary production. Furthermore, picoplankton, such as bacteria, appear preferentially to utilize certain dissolved organic phosphorus compounds to obtain other associated nutrients, such as carbon and nitrogen. It seems that the significance of the roles of both dissolved inorganic and organic phosphorus in supporting primary production—and, hence, CO2 uptake and particulate organic carbon export—has been hitherto underestimated.

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Figure 1: 33P/32P ratios in rain and sea water.
Figure 2: Phosphorus ages and particulate organic carbon (POC) fluxes.

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Acknowledgements

We wish to thank G. Crossin, J. Andrews, L. Ball and C. Tarr for help in sample preparation, collection and purification. We also thank the crew of the RV Cape Hatteras. The manuscript was greatly improved with the help of E. Ingall. This work was supported by NSF, EPA STAR Fellowship Program, and WHOI unrestricted funds.

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  1. Woods Hole Oceanographic Institution, Woods Hole, 02543, Massachusetts, USA

    Claudia R. Benitez-Nelson & Ken O. Buesseler

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  1. Claudia R. Benitez-Nelson
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  2. Ken O. Buesseler
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Correspondence to Claudia R. Benitez-Nelson.

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Benitez-Nelson, C., Buesseler, K. Variability of inorganic and organic phosphorus turnover rates in the coastal ocean. Nature 398, 502–505 (1999). https://doi.org/10.1038/19061

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