Abstract
Three species of luminous bacteria are found in the nearshore surface waters of southern California; two of these account for over 99% of the strains isolated. Photobacterium fischeri is found throughout the year in concentrations between 1 and 5 cells Beneckea harveyi predominates in summer (2.5–3.0 cells · ml−1) but is almost totally absent during winter. Photobacterium phosphoreum was detected in only a few winter samples. This seasonal pattern was repeated over a 23‐month sampling period. The abundance of B. harveyi is very highly correlated with the ambient surface water temperature. Growth rate studies indicate that B. harveyi is more temperature sensitive than P. fischeri when grown in a complex medium.
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