. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 234 DISCOVERY REPORTS due to diatoms, dinoflagellates and ciliate Protozoa, but it is quite probable that Trichodesmium may also form blooms within the area sometimes. The conditions observed on the Orange river line during the second survey did not conform to the generalizations found to hold good for the rest of the area (Fig. 72). Here a diatom-rich plankton with both oceanic and neritic elements was found at the two offshore stations, and inshore there was an exceptionally poor phytoplankton
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 234 DISCOVERY REPORTS due to diatoms, dinoflagellates and ciliate Protozoa, but it is quite probable that Trichodesmium may also form blooms within the area sometimes. The conditions observed on the Orange river line during the second survey did not conform to the generalizations found to hold good for the rest of the area (Fig. 72). Here a diatom-rich plankton with both oceanic and neritic elements was found at the two offshore stations, and inshore there was an exceptionally poor phytoplankton with a high proportion of Metazoa and Seston. The hydrological data and qualitative plankton observations give some basis for the ' explanation', necessarily somewhat speculative, of this reversal of the usual pattern of quantitative distribution that has been attempted later (p. 245). .VSIOiO WSIOSI WSOS2 WSOS3 WS054. 50 IOO SEA MILES FROM LAND Fig. 72. Distribution of the main groups of microplankton, estimated totals per net haul, survey II, Orange river line, 21-24 September 1950. Distribution of the main diatom groups First survey The distribution of the main groups of diatoms, distinguished as described on p. 214, is summarized in Table 16. This shows the estimated total diatom numbers, estimated group totals, and relative percentages for each individual station. The stations are arrayed in order of the seven lines of observa- tions as they were worked, from north to south (cf. Table 14). As a further aid to description, the estimated group totals have been plotted on a logarithmic scale, in relation to the distance of each station from the coast (Figs. 73-76). In these figures the distance- scale reads seawards from the left of the page for each line, departing from the chronological sequence in order to secure uniformity of treatment in this respect. In commenting on the group distribution, reference has been made to qualitative data not given here, because the group t
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