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Picophytoplankton Distribution in the Chuuk Lagoon South Pacific  

Noh Jae-Hoon (Marine Environmental Research Division, KORDI)
Lee Mi-Jin (Ocean Policy Center, KORDI)
Publication Information
Korean Journal of Environmental Biology / v.24, no.1, 2006 , pp. 81-88 More about this Journal
Abstract
The cell abundance and marker pigment distribution patterns of picophytoplankton in the Chuuk Lagoon, tropical South Pacific, were analyzed flow cytometry and HPLC. Also, respective contribution of Synechococcus, Prochlorococcus and picoeukaryotes on estimated carbon biomass was evaluated. Synechococcus and Prochlorococcus showed contrasting distributional patterns in the waters of Chuuk Lagoon. Relatively high concentration of Synechococcus was observed near Weno Island but the concentration decreased toward the Northeast Passage. However, Prochlorococcus showed an opposite distributional pattern. Picoeukaryotes did not show any significant variable difference. The range of divinyl chlorophyll a (Chl. $\alpha$) concentration, marker pigment of Prochlorococcus, was $1.2\sim180.3\;ng\;L^{-1}$ and higher concentrations were observed at the stations near the Northeast Passage than stations near Weno Island. This pigment pattern was similar to cell abundance pattern indicating that chi. a2 may be a useful biomass indicator. On the other hand, the range of zeaxanthin concentrations was $61.4\sim135.8\;ng\;L^{-1}$ showing comparatively less significant variation indicating zeaxanthin influence derived from Prochlorococcus. Estimated carbon biomass of Synechococcus contributed 68% of total picophytoplankton biomass. Prochlorococcus and picoeukaryotes respectively contributed 17.1% and 14.9% of total picophytoplankton biomass.
Keywords
Chuuk Lagoon; flow cytometry; pico-phytoplankton; abundance; pigment; carbon biomass;
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