. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 52 DISCOVERY REPORTS the surface and the o-ioo m. layer shows very little variation from south to north across the Scotia Sea in the months of January and October. The April observations fall mid- way between those of January and October, showing that regeneration is having an effect in the increased value of the April figures over those of January. The April values for silicate content are more uniform than those for phosphate, and, except close to the South Orkney Islands, the silicate content
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 52 DISCOVERY REPORTS the surface and the o-ioo m. layer shows very little variation from south to north across the Scotia Sea in the months of January and October. The April observations fall mid- way between those of January and October, showing that regeneration is having an effect in the increased value of the April figures over those of January. The April values for silicate content are more uniform than those for phosphate, and, except close to the South Orkney Islands, the silicate content falls gently from south to north. The reason for this may lie in the quicker regeneration in situ of silicate over phosphate, which latter is partly held by the zooplankton, whereas a large proportion of the silica skeleton of the diatoms is excreted when the phytoplankton is consumed by the zooplankton. The high AC MAR [{ SEPT LATITUDE STATION 60" S 5B" m (VI 1/1 in ttj OJ _l i_ 54° 52°S OJ aooo- q in & 1000 O MARCH 1934- X SEPTEMBER 1934 0-IOOm SURFACE. &!c? suRFACe x- - ~_~_-JT<X SEPT SURFACE*" SEPTEMBER SURFACE and 0-100 MARCH_0^120_-G MARCH SUR?ACE ' Fig. 15. Surface silicate content and the average silicate content of the o-ioom. layer between the Falkland Islands and Elephant Island. value at the most southerly station in April is due to the presence of Weddell Sea water close to the South Orkney Islands. The January values probably approach very closely to the minimum concentration of silicate in the surface layer of the Scotia Sea, and, in the absence of observations earlier than October, we can say that a minimum of about 50 per cent of the available silicate is withdrawn during the phytoplankton season at the south of the Scotia Sea, and something approaching 80 per cent in the north. Between the Falkland Islands and Elephant Island there are only two sets of data, one obtained in March 1934 and the other in September 1934, each set of ob
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