Discovery reports (1957) Discovery reports discoveryreports28inst Year: 1957 220 DISCOVERY REPORTS 1-2 - 10- 08- 0 6 - 0 4- 0-2- ,o, i-o ANTARCTIC [_ j _ 1 | 'â â â ; â OS 06 0 4 H o 02 O z < O 6 LU 21 O 4 02 O 06 04- 02 - O SUB-ANTARCTIC __L_ Zl SUB-TROPIC â r; v.;:.' -'.'.'. TROPIC 1ââ¢â ~T- r SO 100 250 500 750 IOOO 1500 INTERVALS OF DEPTH (metres) Fig. 14. o-J- SUB-TROPIC ANTARCTIC TROPIC SUB-ANTARCTIC Fig- IS- Fig. 14. Comparison of the mean concentration ( volume per 50 m. haul) of zooplankton at seven intervals of depth in the Antarctic, sub-Antarctic, sub-tropic and tropic
Discovery reports (1957) Discovery reports discoveryreports28inst Year: 1957 220 DISCOVERY REPORTS 1-2 - 10- 08- 0 6 - 0 4- 0-2- ,o, i-o ANTARCTIC [_ j _ 1 | 'â â â ; â OS 06 0 4 H o 02 O z < O 6 LU 21 O 4 02 O 06 04- 02 - O SUB-ANTARCTIC __L_ Zl SUB-TROPIC â r; v.;:.' -'.'.'. TROPIC 1ââ¢â ~T- r SO 100 250 500 750 IOOO 1500 INTERVALS OF DEPTH (metres) Fig. 14. o-J- SUB-TROPIC ANTARCTIC TROPIC SUB-ANTARCTIC Fig- IS- Fig. 14. Comparison of the mean concentration ( volume per 50 m. haul) of zooplankton at seven intervals of depth in the Antarctic, sub-Antarctic, sub-tropic and tropic zones. This and Fig. 15 are based on results given in Table 7. Fig. 15. Comparison of the mean total volume (1000-0 m.) in the Antarctic, sub-Antarctic, sub-tropic and tropic zones. CIRCUMPOLAR VARIATIONS WITHIN THE ANTARCTIC ZONE The data discussed in the previous section have shown that when the distribution of the standing crop of zooplankton is considered in a north-south direction large-scale variations are observed. These are undoubtedly related to the considerable north-south gradients that occur in the physical and chemical character of the principal water masses. In the Southern Ocean hydrological differences in an east-west direction are small and all the main water masses, with the exception perhaps of the Antarctic Bottom Water (Deacon, 1937), have a circumpolar continuity. This is reflected, as Baker (1954) has shown, in the continuous circumpolar distribution of nearly all the commoner species of Antarctic phytoplankton and zooplankton. Hart (1934, 1942) has shown that for the Antarctic phytoplankton there are some localized neritic areas, particularly near South Georgia, where the standing crop is exceptionally great in summer. In the Antarctic oceanic areas, however, which he provisionally divided into the Northern, Intermediate and Southern regions, the standing crop was much less, and there was little regional variation during the period of main incre
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