. LONGITUDE Fig. 17. LONGITUDE Fig. 18. Fig. 17. Comparison of the total volume of zooplankton (1000-0 m.) in various sectors of the sub-Antarctic and Antarctic. Allowance has been made for the differences in the number of winter and summer observations in each sector. Fig. 18. Comparison of the mean volume of zooplankton in the three principal Antarctic Surface Drifts during the main period of increase (November-April), together with the number of observations in each sector. Table 8. The variation in mean total volume ( 1000-0 m.) between various sectors of the sub-Antarctic and Antarcti
. LONGITUDE Fig. 17. LONGITUDE Fig. 18. Fig. 17. Comparison of the total volume of zooplankton (1000-0 m.) in various sectors of the sub-Antarctic and Antarctic. Allowance has been made for the differences in the number of winter and summer observations in each sector. Fig. 18. Comparison of the mean volume of zooplankton in the three principal Antarctic Surface Drifts during the main period of increase (November-April), together with the number of observations in each sector. Table 8. The variation in mean total volume ( 1000-0 m.) between various sectors of the sub-Antarctic and Antarctic zones. Allowance has been made for there being different numbers of summer and winter observations in each sector. Total numbers of winter and summer observations in each sector are given in brackets 6o° W-o° 0° 20° E 20-1200 E i2o°E-i8o°W i8o-6o°W Sub-Antarctic Antarctic 10-65 (5) 8-40 (28) 7-84 (28) ii-I9(35) 8-89 (19) 10-25 (36) 5-27(i5) 9-14(20) 7-50(16) 9-39 (12) 6-84 (18) 8-i4(3i) The mean total volume ( 1000-0 m.) of plankton in different regions of the Antarctic, and also of the sub-Antarctic, are compared in Table 8, the results being represented diagrammatically in Fig. 17 (allowance has been made for the different numbers of winter and summer observations). The bulk of the observations are from the Atlantic sector and have been treated in three groups, 6o° W-o°, o° and 200 E. Data from the other areas have had to be treated in groups of larger intervals of longi- tude which correspond roughly to the main geographical divisions of the Southern Ocean, 20-1200 E being the Indian Ocean sector, 120-1800 the Australian-New Zealand sector, and 180-600 W the
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