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Proceedings Paper

Observations of a Synechococcus-dominated cyclonic eddy in open-oceanic waters of the Arabian Sea
Author(s): Robert R. Bidigare; Mikel Latasa; Zachary Johnson; Richard T. Barber; Charles C. Trees; William M. Balch
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Paper Abstract

The optical, chemical and biological characteristics of a cyclonic eddy were investigated in the Arabian Sea during November 1995. This eddy was 3,000 km2 in area and located 350 km offshore of the coast of Oman. The mixed layer of this feature extended to a depth of 17 m, below which oxygen concentrations were depleted to 10 percent of surface values. Chlorophyll a concentrations within the mixed layer averaged 1.7 mg m-3. Microscopic observations and flow cytometric measurements revealed that the algal community was dominated by the coccoid cyanobacterium Synechococcus. Detailed pigment analyses documented additional phytoplankton biomass contributions by Prochlorococcus, diatoms, dinoflagellates, pyrmnesiophytes, cryptophytes, chlorophytes and pelagophytes. This algal community caused a marked attenuation of the blue to bluegreen wavelengths of light, resulting in a preferential transmittance of green light with increasing depth. Measurements of photosynthetic performance and the spectral absorption coefficient document that the phytoplankton community was photo- and chromatically-adapted to the light environment within the eddy. The results of this field work support a previous laboratory study which found that the nonphotosynthetic carotenoid zeaxanthin produces significant decreases in the maximum quantum yield of photosynthesis of the marine cyanobacterium Synechococcus.

Paper Details

Date Published: 6 February 1997
PDF: 6 pages
Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); doi: 10.1117/12.266452
Show Author Affiliations
Robert R. Bidigare, Univ. of Hawaii (United States)
Mikel Latasa, Univ. of Hawaii (United States)
Zachary Johnson, Duke Univ. (United States)
Richard T. Barber, Duke Univ. (United States)
Charles C. Trees, San Diego State Univ. (United States)
William M. Balch, Bigelow Lab. for Ocean Sciences (United States)

Published in SPIE Proceedings Vol. 2963:
Ocean Optics XIII
Steven G. Ackleson; Robert J. Frouin, Editor(s)

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