DISCOVERY REPORTS 



to 



UJ . 



< 2 



a< 



o 



LiJ 



ID 



UJ 



r k 



HUJ 



°- S 



NUMBER OF SPECIES OF COPEPQDA 

 PRESENT 



ZO 



30 



40 



50 



60 



164 

 129 



l03-< 



I5i 



0- 



50 

 100 



250- 



500 



144 



750 



94 



1000 



•f 



• 23(-2 + 4 = NET GAIN Z) 



+ 8 = NET GAIN 8 



• 38 (- 4 + 1 U NET GAIN 7 J 



■56 



/(-B + 24 . 



: NET GAIN 18) 



•54 (-2) 



Fig. 54. Curve prepared by the late Mr Andrew Scott showing the increasing number of species of Copepoda 

 with increasing depth in the South Georgia region of the Antarctic Zone. 



The mean vertical distributions of the more important species are compared in Figs. 

 55 and 56; here again reference should be made to the temperature and salinity curves. 



Calanidae 



Calanns simillimus, Giesbr. Whilst this species was found throughout the area, it was 

 not so abundant as C. propinqims or C. acutus. For the December-January South Georgia 

 survey, 1926-7, the average number per 50 m. haul with the N 70 V net in the top 

 250 m. of water was only 18, the maximum number per 50 m. haul being 459 (at St. WS 

 38 50-0 m.). A complete record of its occurrence is given in Appendix II, and its 

 distribution in the top 250 m. is shown in Fig. 57. Farran (1929), in his report on the 

 Terra Nova collection, describes it as " frequent to the south of New Zealand between 

 50 and 6o° S. and at two stations south of 60° S". Previously Wolfenden (1908) from 

 the National Antarctic (Discovery) collection gave a similar distribution, but recorded 



