MAC - a/T7/y? 



/0,0 



0,01 0.! 



!.0 



100 



0,1 1,0 :o,o 



M.fZ ' am /J! 



AV\ 



0,1 !.0 10 



N-NO3 Ug-aton/Z 



Fig. 9. Relationship of nitrates with production at the surface (a), 

 production in the layer of maximum AN (b), content of chlorophyll a_ i n 

 the layer of maximum AN (c), and hourly AN (d): a, b, c, tropics; d, 

 World Ocean; 1, t° = 0-10°C; 2, t° = 10-20°C; 3, t° = 20-30°C; I, 

 regression lines; II, Michael is-Menten curves. Vertical line sections 

 show mean square deviations. 



nutrient salts, higher values of AN are characteristic (Saijo, Ichimura, 

 1960; Aruga, Monsi , 1962; Ichimura, Aruga, 1964; Thomas, 1970; Malone, 

 1971). 



A positive connection has also been established between AN and the 

 conditions of mineral nutrition in the seasonal aspect (Vedernikov, 

 Solov'yeva, 1972). 



To analyze the variation in values of AN, measured at the optimal 

 or neaar-optimal level of illumination (AN„p|-) with the content of 

 nitrates, 370 parallel determinations of chlorophyll _a_, production and 

 nitrates in various seas and oceans were analyzed. Only the results of 

 measurement of AN in samples containing 0.1-10 mg/m^^ of chlorophyll _a_ 

 were used, since with lower contents of chlorophyll the random error of 



247 



