Discovery reports (1935-1936) Discovery reports discoveryreports11inst Year: 1935-1936 PHYTO- AND ZOOPLANKTON INTERRELATIONS MILLIONS OF CELLS 150 100- 50- 40' 30 20 10-j 0 PHYTOPLANKTON EXPRESSED IN NUMBER OF CELLS AND IN VOLUME NUMBER OF STATIONS AVERAGED VOLUME IN 30 measure of phytoplankton production. We should not expect to find whale concentra- tions in those parts of an area which had a markedly lower phosphate content than the rest. It is important to observe that the records of phosphate values give an indication of the production of phytoplankton over a little time in the
Discovery reports (1935-1936) Discovery reports discoveryreports11inst Year: 1935-1936 PHYTO- AND ZOOPLANKTON INTERRELATIONS MILLIONS OF CELLS 150 100- 50- 40' 30 20 10-j 0 PHYTOPLANKTON EXPRESSED IN NUMBER OF CELLS AND IN VOLUME NUMBER OF STATIONS AVERAGED VOLUME IN 30 measure of phytoplankton production. We should not expect to find whale concentra- tions in those parts of an area which had a markedly lower phosphate content than the rest. It is important to observe that the records of phosphate values give an indication of the production of phytoplankton over a little time in the past, a period of time, which would allow either the phytoplankton to be reduced by the Euphausians or allow the distribution of Enphausia to be adjusted according to the hypothesis of exclusion, and also that of the whales. We have demonstrated on p. 68 that measurement of phytoplankton either by the number of cells or by volume is not really satisfactory, so that an estimation by reduction in phosphate content for this and the reason just given may often be a better guide than actual phyto- plankton measurements at the time. This will not invariably be so, because if phytoplankton pro- duction ceases and the crop dies down, then as time elapses phos- phate measurements will lose their value as a guide. Since the survey with which we are concerned was carried out the results of the phosphate determi- nations of later surveys have been 20 10 >I05 101-105 96-100 91-95 66-90 PgOs IN MGM PER M- <BG Fig. 145. Correlations of phytoplankton production with phosphate values averaged for the top 50 m. published in the Station Lists in the Discovery Reports ;x there are whale distribution figures published by Kemp and Bennett which correspond in time to three surveys at South Georgia and one at the South Shetlands. Supposing for a moment that the inverse correlationship between the phytoplankton and the Euphausians is correct, we will attempt to deduce the state of the whale fishe
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