. FIN WHALES BLUE WHALES CD Fig. 143. Euphausia superba and whale distribution in March 1926 (whale distribution from Kemp and Bennett, 1932). Few as these plankton observations are, combined with the observations of Mack- intosh and Wheeler just quoted, they suggest strongly that the movements of the whales during their sojourn south are very intimately bound up with the distribution of their food. These conclusions are found to be strengthened by considerations to be discussed in the next section. A FURTHER CONSIDERATION OF THE PLANKTON AND THE WHALE FISHERIES, WITH AN INTRODUCTION TO THE HY
. FIN WHALES BLUE WHALES CD Fig. 143. Euphausia superba and whale distribution in March 1926 (whale distribution from Kemp and Bennett, 1932). Few as these plankton observations are, combined with the observations of Mack- intosh and Wheeler just quoted, they suggest strongly that the movements of the whales during their sojourn south are very intimately bound up with the distribution of their food. These conclusions are found to be strengthened by considerations to be discussed in the next section. A FURTHER CONSIDERATION OF THE PLANKTON AND THE WHALE FISHERIES, WITH AN INTRODUCTION TO THE HYPOTHESIS OF ANIMAL EXCLUSION It is now desirable to seek an explanation for the distribution of the Euphausia superba. At first temperature suggests itself. We know that they are cold-water forms, and we find them in the December-January survey situated off the north-east coast in water which is colder than that on the south-western side, where the Bellingshausen Sea current has the greater influence. Yet in March 1926, when they were concentrated in such large numbers against the coast, the temperature of the water they were in had an average for the top 50 m. of 2-6° C, which is greater than that found at any part, even off the western coast, during the December-January survey 1926-7. Further, in March the temperatures are higher at the stations against the coast than they are farther out in
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