25° 



THE BARENTS SEA 



30° 35" 40° 



103 



45° 



200- 



")500 



200 



LESS THAN'--: 

 1200 mg/m* £| 



45° 



73° 



72° 



71° 

 70° 

 69° 



Fig. 38. Distribution of plankton wet weight in to 25 m 

 layer of water, mg/m 3 . A — in second half of June 1937 

 (Manteufel). 1 Plankton biomass above 1,000 mg/m 2 ; 

 2 Plankton biomass 500 to 1,000 mg/m 2 . 



The mass destruction of Calanus by Ctenophora in 1938 becomes particu- 

 larly conspicuous from a comparison of the quantitative distribution of this 

 crustacean in 1937 and 1938 (Figs. 38 and 39) with the wet weight of plankton 

 in the to 25 m layer of the southwestern part of the Barents Sea, expressed 

 in mg/m 3 {Table 38). 



M. Kamshilov (1957) has elucidated some most interesting details of the 

 role of Ctenophora in the development of plankton. Three species of Cteno- 

 phora, Bolinopsis infundibulum, Pleurobrachia pileus and Beroe cucumis 





25° 30° 35° 40° 



Fig. 39. In second half of June 1938— the same notation 

 as in Fig. 38. 



