

IZ 



16 



ZO ZU Z8 SI 



SS 



^O 



^■^ 



«^ 5Z Up 



Fig. 29. Dimensional structure of a population of Buccinum cyaneum 

 tenebrosum in early fall in the eastern portion of the Barents Sea. 



/d; 



Ordinate shows number of individuals N per 

 height H , mm. 



abscissa shows shell 



W. 



20 



// 

 8 



 - 8 - 



^ Years 



Fig. 30. Linear (1) and weight (2) growth of Bucci num cyaneum var. 

 tenebrosum in the eastern Barents Sea. Ordinate shows weight (W^), 

 and shell height H mm; abscissa shows age, years. 



species and genera wi 

 from the similarity o 

 population, biomass a 

 organisms with short 

 with large dimensions 

 particularly with ape 

 the unevenness of the 

 life form, the fluctu 

 greater than under re 



th similar dimensions and body weights, resulting 

 f their metabolic activity. The fluctuations in 

 nd production of populations are maximal for small 

 life cycles and comparatively greater for species 



and longer life durations. With severe, and 

 riodic changes in environmental conditions due to 



rate of elimination of species even of a single 

 ations in the production process are significantly 

 latively stable conditions. 



The rate of the production process is related to the genetically 

 determined thermopathy of the species. In species of warm-water origin 

 in the northern hemisphere, the maximum production is observed in the 

 southern portion of their areas of distribution in shallow waters and 

 becomes quite great during the heat of summer. The mean annual value of 

 production of these species in boreal waters can be calculated on the 

 basis of observations made in early fall. The widespread boreal species 

 in the southern portions of their areas of distribution yield the 

 maximum production in spring, and reach the mean annual values of their 



317 



