Discovery reports (1957) Discovery reports discoveryreports28inst Year: 1957 8 0 h 1 \ 1 \ \ / \ 6 / *. / \ \ / / ; 8 —-o \ 0 9 I T m N IX x xi xn 1 Fig. vi vn VTTT MONTH 8. Seasonal variation in the mean concentration of zooplankton in the 100-50 m. and 50-0 m. horizons of sub-Antarctic and Antarctic surface water. The numbers on each curve refer to the number of observations in each month. From Fig. 7 and Table 3 it is also clear that the largest seasonal fluctuations in plankton density take place in the surface waters, which of course are the seat of phytoplankton production. The degr
Discovery reports (1957) Discovery reports discoveryreports28inst Year: 1957 8 0 h 1 \ 1 \ \ / \ 6 / *. / \ \ / / ; 8 —-o \ 0 9 I T m N IX x xi xn 1 Fig. vi vn VTTT MONTH 8. Seasonal variation in the mean concentration of zooplankton in the 100-50 m. and 50-0 m. horizons of sub-Antarctic and Antarctic surface water. The numbers on each curve refer to the number of observations in each month. From Fig. 7 and Table 3 it is also clear that the largest seasonal fluctuations in plankton density take place in the surface waters, which of course are the seat of phytoplankton production. The degree of seasonal variation is better illustrated in Fig. 8, where the mean monthly volumes of the 50-0 and 100-50 m. hauls have been plotted graphically. The highest summer mean volume is about seven times as great as the lowest winter mean volume in the sub-Antarctic, and about six times as great in the Antarctic at the 50-0 m. level. In both zones there are two main periods of increase, the first in spring reaching its maximum at the 100-50 m. level and the second in autumn at the 50-0 m.
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