Chemical characterization of three large oceanic diatoms: potential impact on water column chemistry

J. C. Goldman, D. A. Hansell, M. R. Dennett

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

Stephanopyxis palmeriana, Pseudoquinardia recta and Navicula sp. (cell volumes 1.15 × 105 to 3.83 × 105 μm3), were isolated from the Sargasso Sea and cultivated in batch cultures under low irradiance. Growth rates μ of each species occurred in two phases, an exponential phase where μ varied from 0.72-1.12 d-1 and a much slower transition phase that lasted from 3-6 d. Diffusion limitation of nutrient transport may control growth rates during this latter phase. Exponential growth rates were rapid enough to meet the requirements of a bloom scenario wherby total annual new production in a locale such as the Sargasso Sea could be met in a single 21 d bloom. The C:N:P ratio of all species was close to the Redfield proportions during exponential growth. Uncoupling between photosynthesis and nutrient acquisition was evident in S. palmeriana, with carbon accumulation, both in the form of phytoplankton carbon and dissolved organic carbon, continuing well into the stationary phase, long after nutrients were depleted from the growth medium. In fact 50% of particulate organic carbon production occurred after the culture entered the stationary phase. -from Authors

Original languageEnglish (US)
Pages (from-to)257-270
Number of pages14
JournalMarine Ecology Progress Series
Volume88
Issue number2-3
DOIs
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

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

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