• a ,1 



•I 

 .3 



. •■'^ ■* 



— r-. ■*'.'■• .  ^ ' "* 



V -• • * ^ • 



 • • • 



* * .* ' • 



Fig. 11. Primary production (a), 

 AN (b), and chlorophyll £ 

 concentration (c), and temperature 

 with various contents of nitrates in 

 the water: 1, <0.1; 2, 0.1-1.0; 

 3, >1.0 ug-atom/Ji N-NO3; 4, data on 

 nitrates not available. Vertical 

 line segments on graph b show mean 

 square deviations of AN; a, c, 

 tropics; b. World Ocean. 



in both cases. Thomas (1966) showed that the optimal 

 the growth rate of the tropical algae Chaetoceros and 

 in the 27-37°C interval. Williams and Murdoch (1966) 

 depression of assimilation activity of chlorophyll in 

 at temperatures of 25-30°C. 



temperature for 

 Nannochloris lies 

 found no 

 the summer months 



The curves presented in Fig. lib were used to determine the values 

 of Qj^Q for various temperature intervals (Table 2). 



The mean value of Qig for zones with different contents of nitrates 

 was found to be 2.2 in the 0-20°C interval, 1.7 in the 0-30°C 

 interval. The former of these values coincided with the value of Q^Q' 

 obtained for the littoral waters long the Atlantic coast of the USA 

 (Williams, Murdoch, 1966). From this it follows that for the mean 

 assimilation activity of chlorophyll under natural conditions over a 

 broad temperature interval, the most probable values of Qj^q are close to 

 2, at least in mesotrophic and eutrophic waters. The values of Qig for 

 individual S'C intervals were maximal at 10-15°C, decreasing rapidly 



251 



