Light and picophytoplankton in the Gulf of Eilat (Aqaba)

Noga Stambler

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

The underwater light field and phytoplankton abundance in the Gulf of Eilat were studied at station A1 during 1996-2000. In summer, a deep chlorophyll maximum developed at about 80 m, characterized by high concentrations of Prochlorococcus, while during the mixing time, Prochlorococcus, Synechococcus, and eukaryotic algae were found throughout the water column. Chlorophyll concentrations in the euphotic zone were low (0.1-0.6 μg L-1) and as such, the phytoplankton influence on light attenuation was minor. The vertical attenuation coefficient, Kd (PAR) (photosynthetically available radiation), showed seasonal fluctuation, with a summer minimum of ∼0.04 m-1 and a spring maximum of ∼0.065 m-1. The euphotic zone ranged to depths between 80 and 115 m. Phytoplankton absorption spectra were shown to be dependent on depth. During summer stratification, as a response to the exponential decrease of light in the water column, the phytoplankton exhibited photoacclimation, evident as a marked increase in cellular chlorophyll with increasing depth. Light in the Gulf is not a limiting factor even down to more than 100 m, except when combined with stratification, e.g., nutrient limitation, does it affect phytoplankton abundance and composition.

Original languageEnglish
Article numberC11009
JournalJournal of Geophysical Research: Oceans
Volume111
Issue number11
DOIs
StatePublished - 8 Nov 2006
Externally publishedYes

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

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