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Concentrations of extracted phycobiliproteins were measured a t a station off the Southern California coast, USA, from November 1985 to March 1986. The main pigment found was phycoerythrin-543 (PE) from Synechococcus spp. as described by Alberte et al. (1984). Concentrations of PE in water column, between 3 and 40 m, varied between 0.01 and 1 60 pg 1-' Maximum values were found between 3 and 22 m. In situ concentrations of PE were posit~vely correlated with cell numbers of Synechococcusspp., which ranged from 1.4 to 116 X 106 cells I ' , and showed maximal values between 3 and 13 m. Because no other types of PE were detected, all PE measured was considered to come from Synechococcus-type cells. Cellular concentrations of PE varied between 2.1 and 40.3 X 10-' pg PE cell-', with an average value of 10 5?4.1 X IO-' vg PE cell-' above the 1 % isolume for PAR (Photosynthetically Available Radiation). Pigment per cell increased consistently with depth dunng autumn and spring and had low and relatively constant values in the winter. High PE:cell (>20 X l O ' pg PE cell-') was observed only below the 1 % isolume for PAR. For all samples, cellular concentration of PE was inversely correlated with incident PAR and was positively correlated to dissolved inorganic nitrogen (nitrate) concentration. Cyanobactena were not a dominant component of phytoplankton standing stock during this study, contributing an estimated 4 to 15 O/O of total chlorophyll in the water column, but had high specific growth rates, with maximal values of >0.75 d' close to the surface. Absorption of light at 540 nm, as measured by in vivo absorption spectra of phytoplankton, was not correlated with PE concentration in the water column.

marine ecology. progress series

Adaptation of Synechococcus in situ determined by variability in intracellular phycoerythrin-543 at a coastal station off the Southern California coast, USA