Archive image from page 44 of Discovery reports (1934) Discovery reports discoveryreports08inst Year: 1934 CORETHRON VALDIVIAE SPINELESS CHAINS PHYTOPLANKTON OF SOUTH GEORGIA 35 Stations on the Cooper Island line, were richer than those obtained on the more westerly lines described above, and this was, in fact, the case. At all the first five stations proceeding outwards from the land, the two large dino- flagellates so common on this survey predominated in small hauls taken in water of comparatively high temperature. Out- side these, however, a fairly rich diatom plankton was found, and the
Archive image from page 44 of Discovery reports (1934) Discovery reports discoveryreports08inst Year: 1934 CORETHRON VALDIVIAE SPINELESS CHAINS PHYTOPLANKTON OF SOUTH GEORGIA 35 Stations on the Cooper Island line, were richer than those obtained on the more westerly lines described above, and this was, in fact, the case. At all the first five stations proceeding outwards from the land, the two large dino- flagellates so common on this survey predominated in small hauls taken in water of comparatively high temperature. Out- side these, however, a fairly rich diatom plankton was found, and the dinoflagellates were of no appreciable importance. The three outer stations, 344, 343 and 342, all showed surface temperatures more than 0-5° C. lower than those at the inshore stations where dinoflagellates were dominant. The principal diatoms were Corethron valdiviae and Thalassiothrix antarctica, the proportion of the latter increasing as one proceeded off- shore. The January-February 1930 survey of the South Georgia area was concluded by the Vakop line (Table VIII, Figs. 4,11), worked almost due east from the island. The conditions found on this line formed a close parallel to the results obtained on the Cooper Island line described above. At the five inshore stations temperatures were relatively high, and dinoflagellates dominant, except in the small sample obtained at St. 353, where the diatom Th. antarctica predominated. At the two outermost stations, worked at somewhat wider intervals than usual in order that the survey might be completed before weather conditions led to delay, the two diatoms Corethron valdiviae and Thalassiothrix antarctica became completely dominant, the change again being accompanied by a consider- able drop in temperature to 2-01° C, the lowest value recorded in the surface waters examined on this survey. St. 356 pro- vided the richest haul of the survey, over 30 million diatoms being estimated. The last two lines worked on this survey thus cut
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