Seasonal variability of phytoplankton distribution and size composition in the Indian sector of Southern Ocean

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The chlorophyll-a concentration was 0.3-0.5mgm-3 in the subantarctic zone (40S-50S). The dominant size of phytoplankton was pico size phytoplankton (< 10um). In the polar frontal zone (50S-60S), the chlorophyll-a concentration increased to 0.4-0.6 mgm-3, but dominated phytoplankton was almost pico size phytoplankton. In the Antarctic divergence area (60S to 65S), chlorophyll a concentration increased to 0.6-0.8 mgm-3, and dominated nano size phytoplankton (>10um). These phytoplankton distribution and composition have been uniform in the same region in spite of the different season. These results should be useful for to establish the future monitoring strategy in the Indian sector of southern ocean.