Kane: Zooplankton biomass and species abundance on Georges Bank 



469 



<61m 



Biomass 



P. minutus 



M. lucens 



61 -100m 







>101m 



C. finmarchicus 



C. typicus 



C. hamatus 



Season Season 



Figure 4 



The average seasonal distribution of biomass and the five dominant species as a function of depth during the ten year 

 study period. Season abbreviation key: W = Winter, ES = Early Spring, LS = Late Spring, S = Summer. EA = Early 

 Autumn, and LA = Late Autumn. 



the 1980's. Extremely low estimates were recorded in 

 1983. 



Interannual fluctuations in late spring biomass were 

 closely related to C. finmarchicus and P. minutus abun- 



dance (Table 1C). The similarities between abundance 

 plots of both species during spring seasons (Fig. 7) 

 suggest that their population dynamics may be con- 

 trolled by similar factors. 



