. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ORANGE R. 10° 15" EAST Fig. 89. Distribution of Asterionella japonica, survey II, September-October 1950. (Station numbers are shown in Fig. 2.) 20e 25 | q* KARSTENI SURVEY:!. ORANGE R. IO° 15° EAST Fig. 90. Distribution of Fragilaria karsteni and F. granula'a, survey I, March 1950. (Station numbers are shown in Fig. 1.) importance in outer shelf-waters. Since they are among the most completely cosmopolitan of all marine plankton diatoms and, moreover, very difficult to separate with certai
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. ORANGE R. 10° 15" EAST Fig. 89. Distribution of Asterionella japonica, survey II, September-October 1950. (Station numbers are shown in Fig. 2.) 20e 25 | q* KARSTENI SURVEY:!. ORANGE R. IO° 15° EAST Fig. 90. Distribution of Fragilaria karsteni and F. granula'a, survey I, March 1950. (Station numbers are shown in Fig. 1.) importance in outer shelf-waters. Since they are among the most completely cosmopolitan of all marine plankton diatoms and, moreover, very difficult to separate with certainty when working at the speed necessary to obtain counts, it is scarcely surprising that they did not show such well-defined distributional trends as most other members of the group. Figs. 92 and 93 show the relative importance (percentage of total diatoms) of Thalassiothrix longissima, the most essentially oceanic of the ' Pennatae' in this area, to be considerable at the offshore stations, where the total phytoplankton was poor. It was equally abundant at some rich shelf stations where, however, its proportion of the whole flora was insignificant. This same method of treatment was also found necessary to show the high relative importance of the solenoid group offshore during the second survey only. Here they were definitely dominant, and the. 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 not perfectly resemble the original Institute of Oceanographic Sciences (Great Britain); National Institute of Oceanography of Great Britain; Great Britain. Colonial Office. Discovery Committee. London ; New York : Cambridge University Press
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