PHYTOPLANKTON 



207 



DEGREES EAST 



DEGREES WEST 



O BO IOO 120 140 160 180 160 140 120 IOO SO 60 40 20 C 



o1 

 (E 





N9 OF SAMPLES EXAMINED | IO 

 FRACILARIOPSIS ANTARCTICA 

 NITZSCHIA SERIATA 



V DISTEPHANUS SPECULUM 

 CHAETOCEROS CRIOPHILUM 

 RHIZOSOLENIA ALATA 

 RH ANTARCTICA 

 RH. CHUNII 

 RH HEBETATA 

 RH STYLIFORMIS 

 RH. TRUNCATA 



DACTYLIOSOLEN ANTARCTICUS 

 CORETHRON CRIOPHILUM 

 DO., SPINELESS CHAINS 

 SYNEDRA PELAGICA 



V THALASSIOTHRIX ANTARCTICA 



f 



THALASSIOSIRA SPP. 



ASTEROMPHALUS PARVULUS 



BIDDULPHIA STRIATA 



EUCAMPIA BALAUSTIUM 



CHAETOCEROS NEGLECTUM 



CH SOCIALE 



^NITZSCHIA CLOSTERIUM 



CHAETOCEROS ATLANTICUM 



CH CASTRACANEI 



CH. CHUNII 



CH. CURVATUM 



CH DICHAETA 



DO.TENUICORNIS PHASE 



CH. RADICULUM 



^.CH. SCHIMPERIANUM 



Fig. 2. Occurrence of species of phytoplankton in all longitudes around the Antarctic zone of the Southern Ocean, showing 

 the percentage frequency of occurrence in samples taken within every 20 of longitude. 



