Fig. 9. Annual cycle of changes in 

 population of zooplankton in 1955- 

 1956 at Igloolik (Fury and Hekla 

 Strait, Canadian Arctic) (Grainger, 

 1959). Ordinate--number of 

 specimens in the 0-50 m layer, 

 abscissa--months; A, mainly 

 predatory; B, mainly phytoplankton; 

 1, Copepoda, 2, all zooplankton; 

 3. Copepoda nauplii; 4, Cirripedia 

 nauplii; 5, Polychaeta larvae; 

 1, 3--0.24 mm mesh size; 2, 4, 

 5--0.57 mm mesh size. 



YM n: 



JOOOr 



zooo 



woo 



(Wiborg, 1954), Greenland Sea (Kielhorn, 1952; Digby, 1953; Grainger, 

 1959; Gruzov, 1963; Pavshtiks, 1972) and the White Sea (Konoplya, Kokin, 

 1973; Kolosova, 1975). The further north the zone in question, the fewer 

 the number of peaks on the curve, with the meroplanktonic elements of 

 the community disappearing first. In the high Arctic subarea, the general- 

 ized characteristics of seasonal development of zooplankton do not differ 

 in principle from those in the low-Arctic subarea (Digby, 1953; Hughes, 

 1968; Pavshtiks, 1972). Only the absolute biomass and time parameters vary, 

 while the number of peaks decreases. 



In the Arctic community, 

 on the latitude. The further 

 the spring-summer and summer- 

 the Arctic, the spring proces 

 earlier in the neritic water, 

 seasonal changes in the zoopl 

 also occur in the summer, but 

 and below 250 m remains pract 

 Cubic meter for each species 

 1966; Hughes, 1968; Hopkins, 

 particularly in the lower hor 

 seasonal increase in the infl 



the length of the biologic seasons depends 



north, the more the times of appearance of 

 fall faunistic complexes come together. In 

 ses of blooming of the water always begin 



over shallows and along the ice fields. The 

 ankton population beneath the continuous ice 



the number of animals increases but little, 

 ically unchanged, less than 1 specimen per 

 (Vircetis, 1957; Pavshtiks, 1971a, b; Harding, 

 1969). However, the species variety increases, 

 izons of the Central Polar Basin, due to the 

 ux of Atlantic water with its rich fauna. "!"he 



60 



