PHYTOPLANKTON OF BRANSFIELD STRAIT 



109 



THE PHYTOPLANKTON OF BRANSFIELD STRAIT 



During the period studied three surveys of this area were undertaken. The first two, 

 each consisting of eighteen stations on three Hues crossing the strait in a north and south 

 direction, were made by the 'William Scoresby' in February and in November 1929, 

 i.e. in autumn and spring. The third, consisting of seventeen stations on three lines dis- 

 posed somewhat farther to the eastwards than on the preceding surveys, was made by 

 ' Discovery IT ' in December 1930, and in addition six stations at the western end of the 

 strait were worked later in that season. From the times of year at which these observa- 

 tions were carried out it will be seen that this material should give a useful idea of the 

 seasonal changes taking place, the collections having been obtained in late spring, mid- 

 summer and in early autumn. Except for minor complications at the eastern end of the 

 strait due to Weddell Sea influence, the phytoplankton was found to be of very much 

 the same character throughout and much less varied than that of either of the two large 

 oceanic areas studied during the same period. 



THE SURVEY OF FEBRUARY 1929 

 The first line to be considered was that worked farthest to the east, from a point off 

 Admiralty Bay, King George Island, southwards to a point off Graham Land. The 

 full analyses of the phytoplankton material collected on this line are given in Table 

 XXXIII and the positions of the stations, Sts. WS 382-WS 388, m Fig. 49. 



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[Low 1. 



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Fig. 49. Reference chart showing the positions of the stations worked in Bransfield Strait, February 1929. 



