Article
 

Ammonium uptake and regeneration rates in a coastal upwelling regime

Öffentlich Deposited

Herunterladbarer Inhalt

PDF Herunterladen
https://ir.library.oregonstate.edu/concern/articles/7s75dd828

Descriptions

Attribute NameValues
Creator
Abstract
  • 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 ).
  • Keywords: Ammonium uptake, Coastal upwelling, Ammonium regeneration
Resource Type
DOI
Date Available
Date Issued
Citation
  • 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
Journal Title
Journal Volume
  • 121
Urheberrechts-Erklärung
Funding Statement (additional comments about funding)
  • This research was supported by a NASA Graduate Student Fellowship In Global Change Research to M.L.D. and NSF grants OCE-9022403 and OCE-9101904 awarded to PAW.
Publisher
Language
Replaces
ISSN
  • 0171-8630

Beziehungen

Parents:

This work has no parents.

Artikel

Miniaturansicht Titel Hochladedatum Sichtbarkeit Aktionen
file details Dickson_Wheeler1995.pdf 2017-07-24 Öffentlich Herunterladen