FIG. 1.

Ratio of bacterial carbon biomass to phytoplankton biomass in the study area. Bacterial carbon was estimated by using the data in Table 3. Phytoplankton carbon was estimated by assuming that the carbon-to-chlorophyll a ratio is 50. Error bars indicate the ranges of estimates with carbon-to-chlorophyll a ratios ranging from 20 to 100. Regions for which results are shown are indicated either by latitudinal positions (for oceanic samples) or by geographic names (see Table 1). Note that there are four results from the Otsuchi Bay.