. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ^TWwWED A1 ... 1fIVO„ PROTOZOA NOT RECORDED ""'AT WSIOM 2. a o' d d d hd \ OTHER PLANTS RECORDED AT-WS K36I NO SESTON RECORDED AT WS IQbl SEA MILES FROM LAND SO SEA MILES FROM LAND Fig. 70. Distribution of the main groups of microplankton, estimated totals per net haul, survey II, Sylvia Hill line, 21-24 September 1950. Fig. 71. Distribution of the main groups of microplankton, estimated totals per net haul, survey II, Southern Inter- mediate line, 24-25 September 1950. adjacent lines
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ^TWwWED A1 ... 1fIVO„ PROTOZOA NOT RECORDED ""'AT WSIOM 2. a o' d d d hd \ OTHER PLANTS RECORDED AT-WS K36I NO SESTON RECORDED AT WS IQbl SEA MILES FROM LAND SO SEA MILES FROM LAND Fig. 70. Distribution of the main groups of microplankton, estimated totals per net haul, survey II, Sylvia Hill line, 21-24 September 1950. Fig. 71. Distribution of the main groups of microplankton, estimated totals per net haul, survey II, Southern Inter- mediate line, 24-25 September 1950. adjacent lines both north and south displayed the general narrowing of the zone of rich coastal plankton that seemed characteristic of the second survey in its most extreme form. The extremely rich diatom plankton found at the inshore station on the Sylvia Hill line (Fig. 70) showed clearly that, quite locally, the coastal population attained a density as great as that observed during the autumn, but proceeding seawards we again encountered the conditions met with farther north: a more rapid transition to relatively scanty offshore plankton, and greater relative abundance of Metazoa and Seston than had been observed there during the first survey. A very similar distribution of the main groups was also evident on the southern intermediate line (Fig. 71) where the diatom population inshore was one of the richest sampled during either survey. ' Other plants', chiefly represented by isolated filaments and a few rafts of Trichodesmium thiebautii, attained their maximum numbers and greatest relative importance in the comparatively scanty offshore plankton on this line, but it should be emphasized that the species was not observed in any- thing approaching bloom-forming Such blooms as we observed during the surveys were It is one of the commonest and most widely distributed bloom-forming organisms throughout the warm and temperate regions of the South Please note that these
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