. JULY I AUG I SEPT OCT NOV I DEC I JAN I FEB I MAR I APR I MAY I JUNE Fig. 6. Bottom temperature on the shelf; partly hypothetical annual cycle for the intermediate region, corrected to an assumed mean depth of 100 m., with surface cycle for comparison. feature is the lag of at least a month after the surface maximum, and the relatively high autumn and winter values due to mixing. For this reason the seasonal graph does not fall anything like so steeply as does that showing the surface temperatures, from the maximum to midwinter. Observations of the nutrient sah content of the waters of the F
. JULY I AUG I SEPT OCT NOV I DEC I JAN I FEB I MAR I APR I MAY I JUNE Fig. 6. Bottom temperature on the shelf; partly hypothetical annual cycle for the intermediate region, corrected to an assumed mean depth of 100 m., with surface cycle for comparison. feature is the lag of at least a month after the surface maximum, and the relatively high autumn and winter values due to mixing. For this reason the seasonal graph does not fall anything like so steeply as does that showing the surface temperatures, from the maximum to midwinter. Observations of the nutrient sah content of the waters of the Falkland current are not yet available for this area. PLANKTON During the trawling surveys some phytoplankton samples were collected from the waters of the shelf with the Gran net. They have not been fully analysed because of pressure of other work. Most were obtained during the third survey. Mr Rayner made some preliminary observations on them (un- published) and has recorded his impression that they indicate a poorer phytoplankton than that found off the west coast of South America. Some of our early phytoplankton work in the ' Discovery H' extended northwards, to the extreme south of the trawling survey area, and there we found some
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