Ammonium uptake and regeneration rates in a coastal upwelling regime Public Deposited

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  • Ammonium uptake and regeneration rates were measured in time course experiments with 15N as a tracer. Both ammonium uptake and regeneration rates measured over 12 to 18 h remained essentially constant. However, as the length of the incubations increased the amount of usable data decreased dramatically due to substrate depletion and recycling of 15N. Mass balance calculations indicated that 22 to 51 % of the ammonium removed from the dissolved pool was not recovered in the particulate fraction. This appeared to be a more serious problem at 0 and 8 m (47%) than at 25 m (22%). As a result, ammonium uptake rates were probably underestimated. At 0, 12, and 20 m uptake rates either balanced or exceeded regeneration rates, while at 8 and 25 m net regeneration occurred. The fastest rates were measured during upwelling-induced phytoplankton blooms, intermediate rates characterized post-bloom conditions and the lowest rates coincided with an active upwelling event. Ammonium uptake rates were highest during the upwelling season (11 to 17 mmol N m-2 d-1) and lowest during the non-upwelling season (3 mmol N m-2 d-1), whereas regeneration rates did not differ significantly between seasons (11 to 20 mmol N m-2 d-1 ).
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  • Dickson, Mary-Lynn, and Patricia A. Wheeler. 1995. Ammonium uptake and regeneration rates in a coastal upwelling regime. Mar Ecol Prog Ser 121:239-248
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  • INTRODUCTION; MATERIALS AND METHODS: Sampling, Biomass and nutrient concentrations, Ammonium uptake and regeneration experiments, Calculations, Upwelling status; RESULTS: Time course experiments, Depth-dependent ammonium uptake and regeneration rates, Daily and seasonal ammonium uptake and regeneration rates; DISCUSSION.
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  • description.provenance : Approved for entry into archive by Linda Lamb(llamb@coas.oregonstate.edu) on 2009-11-17T23:13:05Z (GMT) No. of bitstreams: 1 Dickson&Wheeler1995.pdf: 918908 bytes, checksum: 264be1e84d1b7b5dd21b98e7fb2c2b64 (MD5)
  • description.provenance : Made available in DSpace on 2009-11-17T23:13:05Z (GMT). No. of bitstreams: 1 Dickson&Wheeler1995.pdf: 918908 bytes, checksum: 264be1e84d1b7b5dd21b98e7fb2c2b64 (MD5) Previous issue date: 1995
  • description.provenance : Submitted by Linda Lamb (llamb@coas.oregonstate.edu) on 2009-11-11T21:59:55Z No. of bitstreams: 1 Dickson&Wheeler1995.pdf: 918908 bytes, checksum: 264be1e84d1b7b5dd21b98e7fb2c2b64 (MD5)
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  • 0171-8630

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