10 LOG(PDW = 



11 LOG(DV) 



12 LOG(WW) = 



13 LOG(DV) 



0.853 + 1.02J, LOG(PC) 45 



1.037 + 0.839 LOG(DW) 111 



0.975 + 0.9A6 LOG(DW) 9It 



0.107 + 1.082 LOG(WW) 76 



To prepare these GM functional regression equa- 

 tions (Ricker 1973:412), the original data were 

 checked and log transformed, and the regressions 

 recomputed. The variances and correlation coeffi- 

 cients remain essentially unchanged. Note that in 

 Wiebe et al. (1975) and above, equations 1-10 are 

 based on biomass standardized to per cubic meter 

 while the remainder are not. Equations 6 and 10 in 

 table 2 of Wiebe et al. (1975) also contained errors; 

 the intercept of equation 6 was incorrectly printed 

 as 0.670 rather than 0.067; the intercept of equa- 

 tion 10, which was 0.558, has been corrected to 

 0.853. 



The equations listed above, when compared with 

 those originally presented, provide estimates of x 

 given yory given x, which generally differ by less 



than 6% in the central part of the data set and by 

 less than 15% in the tails of the data set. Samples 

 similar in biomass and taxonomic composition to 

 those used in this study, which we have analyzed 

 for size of individuals as a function of taxonomic unit 

 (Davis and Wiebe 1985), contain animals which 

 typically range in size from 0.35 mm to 100 mm. 



For a number of samples for which we reported 

 carbon values, nitrogen values were also obtained 

 from the CHN analyzers we used (Table 1 , this note). 

 Although carbon to nitrogen conversion factors exist 

 in the literature, few are based on data ranging over 

 as many hydrographic regimes as does data pre- 

 sented in Wiebe et al. (1975). Since a growing num- 

 ber of mathematical models use nitrogen rather than 

 carbon as the basic currency, we take this oppor- 

 tunity to present these data (Fig. 1) and the result- 

 ing carbon/nitrogen ratio. 



Functional regression of carbon versus nitrogen 

 yielded the following significant {P < 0.01; r' = 

 0.99) relationship: 



10' 



CO 



c 



CD 

 CD 

 O 



10^ 



10' 



1(D^ 



10^ 



10^ 



Carbon (mg/m^) 



Figure 1.— Plot of data used in calculating the regression relating carbon and nitrogen in zooplankton collections from areas specified 



in Table 1. 



834 



