DISTRIBUTION OF ANTARCTIC MACROPLANKTON 



89 



swamped with a shoal of Euphausia superba or Salpa). (iii) Those in an area which was 

 evidently altogether devoid of the species in question, (iv) Those in an area in which 

 the only samples were from a series of daily stations all taken at the same time of day. 



1000- 



500 



DO 04 08 12 16 20 00 04 08 



/ 



00 04 08 12 IS 20 00 04 08 



00 04 08 IE 16 20 00 04 08 



800 



400 



00 04 08 12 16 20 00 04 08 00 04 08 12 IG 20 00 04 08 00 04 08 12 16 20 00 04 08 



400 



200 



00 04 08 12 16 20 00 04 0B 



00 04 08 12 16 20 00 04 08 



00 04 08 12 16 20 00 04 08 



2000- 



1000 



2000- 



00 04 08 12 il 20 00 04 08 00 04 08 12 16 20 00 04 08 00 04 08 12 16 20 00 04 08 



00 04 08 12 16 20 00 04 08 



00 04 08 12 16 20 00 04 08 



00 04 08 12 16 20 00 04 08 



Fig. 19. Diurnal variations of macroplankton species (see legend to Fig. 18). 



Figs. 18, 19 and 20 show the variations for each species. With the available data the 

 average per haul for periods of one hour, or even two hours, gives figures which are a 

 little too erratic. Four-hour periods, however, give more regular results, and have 



