THE BARENTS SEA 



157 



20% 

 10% 



-2° -1° 0° 1° 2° 3° 4° 5° 6° 7°C 

 Fig. 60. Temperature conditions for the existence of certain 

 echinoderms in the Barents Sea (Schorygin, 1928). 1 

 Ophiopleura borealis; 2 Ophiura sarsi; 3 Leptychaster 



arcticus. 



It is interesting to note that some forms have a centre within the limits of 

 their ecological habitat and the biomass decreases with the distance from this 

 centre to the periphery (/, 2, 3, 4). Other forms are uniformly distributed 



Temperature °C 



8763432 10-1-2 87 65 4 32 1 -1-2 



Fig. 61. Ecological habitats of some bottom animals of the Barents Sea (Zenkevitch 

 and Brotzky, 1939). 1 Astarte montagui; 2 Spiochaetopterus typicus; 3 Astarte 

 crenata; 4 Brisaster fragilis; 5 Serripes groenlandicus; 6 Average ecological habitat 

 for 60 mass benthos forms. 



