. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. o d HC? a Yd WS963 WS984 W5985 "'On 70"M^; VOLUME IIOO Yd OINOPHYCEAf' NO OTHER PLANTS RECORDED. OO SEA MILES FROM LAND SO 60 SEA MILES FROM LAND Fig. 60. Distribution of the main groups of microplankton, estimated totals per net haul, survey I, Walvis Bay line, 6-8 March 1950. Fig. 61. Distribution of the main groups of micro- plankton, estimated totals per net haul, survey I, Middle-Intermediate line, 9-10 March 1950. On the northern intermediate line the quantities of microplankton
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. o d HC? a Yd WS963 WS984 W5985 "'On 70"M^; VOLUME IIOO Yd OINOPHYCEAf' NO OTHER PLANTS RECORDED. OO SEA MILES FROM LAND SO 60 SEA MILES FROM LAND Fig. 60. Distribution of the main groups of microplankton, estimated totals per net haul, survey I, Walvis Bay line, 6-8 March 1950. Fig. 61. Distribution of the main groups of micro- plankton, estimated totals per net haul, survey I, Middle-Intermediate line, 9-10 March 1950. On the northern intermediate line the quantities of microplankton were still small and rather uniform, greatest at a moderate distance out towards the shelf-edge and least, owing mainly to the usual drop in diatom numbers, at the station farthest offshore. The proportion of Dinophyceae to diatoms was unusually high, and it will be shown later that local abundance of Gonianlax spinifera was mainly responsible for this. Neither ' other plants' nor Seston were observed on this line. Conditions more typical of the Benguela current proper were first encountered on the Walvis Bay line (Fig. 60). Here the vastly greater quantities of diatoms in the inshore waters and their abrupt decrease seawards are even reflected in the settlement volumes. (The latter are rarely a reliable guide to plankton quantities, being frequently distorted by differential packing among organisms of diverse shapes, the presence of small numbers of extra large organisms, and the necessity of settling out large samples in relatively wide cylinders, so that the volumes cannot be read with the same accuracy as the small ones.) They are included only for their value as a basis for crude comparison with earlier collections in other areas, from some of which numerical estimates are not yet available. 14. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may no
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