Ammonium recycling limits nitrate use in the oceanic subarctic Pacific Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/6108vc82f

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  • Seasonal and diel changes in nutrient concentrations and nitrogen assimilation rates were used to assess the effects of NH4+ on NO3- assimilation. Surface-water NO3- concentrations ranged from 6 to 17 μM while NH4+ concentrations ranged from 0 to 0.4 μM. Total N assimilation ranged from 84 to 732 nM d–1 but showed no seasonal trend. NH4+ and urea concentrations were < 1% of total dissolved inorganic N, but use of this “regenerated” N still accounted for 44–89% of total N assimilation. Rates of NO3- assimilation were negatively correlated with ambient NH4+ concentrations, and concentrations of NH4+ between 0.1 and 0.3 μM caused complete inhibition of NO3- assimilation. NO3- was more important as a source of N in spring than in summer. We attribute this pattern to a summer increase in turnover rates for NH4+. Turnover times for the dissolved NH4+ pool were half as long in August as in May. Grazing and recycling in the euphotic zone apparently both play significant roles in preventing depletion of NO3- in the oceanic subarctic Pacific.
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  • Limnol. Oceanogr., 35(6), 1990, 1267-1278
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  • Methods; Results; Discussion
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  • description.provenance : Made available in DSpace on 2009-10-05T15:12:22Z (GMT). No. of bitstreams: 1 Wheeler&Kokkinakis 1990.pdf: 1113955 bytes, checksum: e312689f1cc95e420986a225e8e9e52d (MD5) Previous issue date: 1990
  • description.provenance : Approved for entry into archive by Linda Lamb(llamb@coas.oregonstate.edu) on 2009-10-05T15:12:22Z (GMT) No. of bitstreams: 1 Wheeler&Kokkinakis 1990.pdf: 1113955 bytes, checksum: e312689f1cc95e420986a225e8e9e52d (MD5)
  • description.provenance : Submitted by Linda Lamb (llamb@coas.oregonstate.edu) on 2009-10-04T20:13:08Z No. of bitstreams: 1 Wheeler&Kokkinakis 1990.pdf: 1113955 bytes, checksum: e312689f1cc95e420986a225e8e9e52d (MD5)
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  • 0024-3590

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