228 



DISCOVERY REPORTS 



wsqso ws9<)i ws<m wsws wsw ws<ns 



SEA MILES FROM LAND 



Fig. 62. Distribution of the main groups of microplankton, 

 estimated totals per net haul, survey I, Sylvia Hill line, 

 io-ii March 1950. 



-0 

 ■6 



1 



HO 



O 



id 



n 



\\ MICROPLANKTON 



Lii 



VOLUME 

 PHYTOPUNKTON |OQ 



IO. 



J l_L 



-.PINQPMICEAE. 



NO DINOPHrCEAE OTHER PLANTS-. 



RECORDED 

 -NO OTHER PLANTS INSHORE 



SEA MILES FROM LAND 



Fig. 63. Distribution of the main groups of microplankton, 

 estimated totals per net haul, survey I, Southern Inter- 

 mediate line, 11-12 March 1950. 



WSI002 WSIOOI WSIOOO WSW WSS9B wsw 



J I I III 



So ■ 100 



SEA MILES FROM LAND 



Fig. 64. Distribution of the main groups of microplankton, estimated totals per net haul, survey I, 



Orange river line, 12-14 March 1950. 



On the Walvis Bay line Protozoa and Metazoa were present only in very moderate numbers, their 

 relative importance greatly increasing beyond the point where the rich diatom plankton declined. Yet 

 again this transition zone was the only point where 'other plants' were noted. 



Rich inshore conditions persisted right out to the seaward end of the short mid-intermediate line, 

 with large volumes, very large numbers of diatoms, and relatively few Dinophyceae (Fig. 61). 



