Nitrogen uptake and phytoplankton growth in coastal upwelling regions Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/pg15bg60h

Support for this rcscarch was provided by NSF grants OCE 82-08873 and OCE 83-08753 to P. Wheeler.

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  • Uptake of nitrogenous nutrients by microplankton off the Washington and Oregon coasts was measured during the 1985 upwelling period. Nitrogen uptake rates in low-NO3- waters (<5 μM) were 0.020–0.258 μmol N liter-1 h-1 and were primarily supported by regenerated nitrogen (71% of total uptake). Nitrogen uptake rates in high-NO3- waters (≥20 μM) were 0.281–1.480 μmol N liter-1 h-1 and new (NO3-) nitrogen supported 83% of total uptake. Phytoplankton N was estimated by assuming a constant Chl a : PN for phytoplankton and was used to calculate phytoplanktonspecific uptake rates. Despite differences in nutrient concentrations, PN and Chl a at three upwelling sites (Oregon, Benguela, and Peru), NO3- uptake normalized to Chl a, and estimates of NO-3-supported phytoplankton growth rates are remarkably similar. Nitrate uptake supports growth rates on the order of 1–2 d-1. Estimates of phytoplankton growth from rates of NH4+ + NO3- uptake range from 1.36 to 4.79 d-1 and are negatively correlated with concentrations of NO3- and phytoplankton N. The apparent increase in phytoplankton growth rates for waters with lower nitrogen availability may result from heterotrophic bacterial utilization of NH4+ nitrogen.
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  • Limnol. Oceanogr., 32(5), 1987, 1112-1123
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  • Methods; Results; Discussion
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  • description.provenance : Submitted by Linda Lamb (llamb@coas.oregonstate.edu) on 2009-10-04T21:35:05Z No. of bitstreams: 1 Kokkinakis&Wheeler 1987.pdf: 1512765 bytes, checksum: a2b951658bde140a8bc4682c1cd531ec (MD5)
  • description.provenance : Made available in DSpace on 2009-10-05T15:08:56Z (GMT). No. of bitstreams: 1 Kokkinakis&Wheeler 1987.pdf: 1512765 bytes, checksum: a2b951658bde140a8bc4682c1cd531ec (MD5) Previous issue date: 1987
  • description.provenance : Approved for entry into archive by Linda Lamb(llamb@coas.oregonstate.edu) on 2009-10-05T15:08:56Z (GMT) No. of bitstreams: 1 Kokkinakis&Wheeler 1987.pdf: 1512765 bytes, checksum: a2b951658bde140a8bc4682c1cd531ec (MD5)
ISSN
  • 0024-3590

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