. BLUE WHALE5 no- Fig. 159. Whale distribution in November 1930 (from Kemp and Bennett, 1932). Blue whales at the same time. We see that the majority of whales of both species were taken in the region of high phosphate content and low pH values to the north-east, whilst we also see an interesting lesser concentration of Fin whales coinciding with the small patch of higher phosphate content to the north. No whales however were taken, as might have been expected, in the region of higher phosphate and lower pU values to the north-west. The major importance of these correlations is tha
. BLUE WHALE5 no- Fig. 159. Whale distribution in November 1930 (from Kemp and Bennett, 1932). Blue whales at the same time. We see that the majority of whales of both species were taken in the region of high phosphate content and low pH values to the north-east, whilst we also see an interesting lesser concentration of Fin whales coinciding with the small patch of higher phosphate content to the north. No whales however were taken, as might have been expected, in the region of higher phosphate and lower pU values to the north-west. The major importance of these correlations is that whales are not found in any numbers in regions of low phosphate content. Turning now to the South Shetlands survey of February 1929, the only one for which phosphate values together with whaling figures are as yet available, the phosphate con- tent is plotted in Fig. 161. The phos- phate values in these latitudes farther south are much greater even than those at South Georgia, but here also are areas of higher and lower phosphate value. We see an area of very high phosphate content close against the Weddell Sea, where pre- sumably very little phytoplankton production has taken place, and an area of comparatively low phosphate content where presumably there has been a heavy production. The pH values are plotted in Fig. 162 where the area of higher />H values, those of 7-95 and over, is seen to 100 90 80 70 60 O O iS o o o !CDC CD 812 14 16 â¢IB B 20 ' 22 ' 24 ' 26 ' â 28 830 -32 834 PR Fig. 160. Correlations of phosphate and pH values, each averaged for the top 50 m., at stations in the November correspond roughly with the area 1930 survey.
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