. Fig. 4. Vertical distribution of the standing crop of zooplankton during September 1936 in o°; June 1936 in 200 E; and October 1932 in 80° W. In 200 E there are no June observations in 1938, but the 1936 series shows the presence of deep concentrations of plankton at a level intermediate between that in April and July 1938 (Fig. 2); and similarly the surface volumes were on the whole not as large as those in April but greater than those in July. The results for 1936 thus appear to fit reasonably well into the general picture presented by the 1938-39 series. The October results for 1932 and 1
. Fig. 4. Vertical distribution of the standing crop of zooplankton during September 1936 in o°; June 1936 in 200 E; and October 1932 in 80° W. In 200 E there are no June observations in 1938, but the 1936 series shows the presence of deep concentrations of plankton at a level intermediate between that in April and July 1938 (Fig. 2); and similarly the surface volumes were on the whole not as large as those in April but greater than those in July. The results for 1936 thus appear to fit reasonably well into the general picture presented by the 1938-39 series. The October results for 1932 and 1934 (fig. 3) in 8o° W, compare very well and show the same essential features, particularly at stations in approximately the same latitude ( Sts. 984 and 1441, 991 and 1447), although the 1934 sub-Antarctic hauls were greater than those in 1932. In both years the plankton was concentrated deeper, the farther south the station. From these three diagrams it would seem that differences from year to year are not, in these instances
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