Nitrate uptake in marine phytoplankton: Energy sources and the interaction with carbon fixation

P. G. Falkowski, D. P. Stone

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

Field studies of whole natural phytoplankton communities from Knight Inlet, B. C., Canada and laboratory cultures of the diatom Skeletonema costatum indicate inorganic carbon fixation may be temporarily suppressed following 10 to 15% enrichment with NO3-or NH4+. (This effect is suggested to be due to competition between inorganic carbon and nitrogen for adenosine triphosphate (ATP), and is reduced when chlorophyll a is increased intracellularly after 6 to 8 h.) Results imply that the source of ATP for nitrate uptake is primarily from Photosystem I (cyclic photophosphorylation) in the presence of light. It would appear that a transient nutrient-adaptive response occurs upon addition of extracellular nitrogen.

Original languageEnglish (US)
Pages (from-to)77-84
Number of pages8
JournalMarine Biology
Volume32
Issue number1
DOIs
StatePublished - Sep 1975
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

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