Table 4. --Values of t^ from tests for equality of transformed means {X' = A + 0.5} 

 of density of zooplankters in four areas of the eastern Chukchi Sea, September- 

 October 1970. 



-^East equals north and south areas combined. 



*t or t' equals difference of means significant at P = 0.05. 



Table 5. --Values of F from tests for equality of variances using transformed data 

 (X' = /X ■«■ 0.5) for density of zooplankters in four areas of the eastern 

 Chukchi Sea, September-October 1970. 



Areas comparecT 



- East equals north and south areas combined. 

 *P • 0.05. 

 **P = 0.025. 



♦**P = 0.010. 



north and south areas separately and combined were 

 significantly lower than for the west area, although the 

 mean of the two areas (11 per 100 m^ for 28 stations) 

 did not differ significantly from the mean for the west 

 area (60 per 100 m^ for 1 1 stations). The density con- 

 tours of /4. longiremis (Fig. 5) tend to run more 

 strongly north-south than the contours for the other 

 species. Although the west-north and west-east differ- 

 ences of means were not statistically significant, the 

 differences are probably real. 



The mean densities and variances of Calanus 

 finmarchicus and Centropages abdominalis were sig- 

 nificantly higher in the west area than in the north and 

 south areas. The separation of north and south areas 

 was not statistically significant for either C. 



1 FATHOM LINE 



I 1 < 216/100 m^ 

 I 1 217-1,296/100 m' 

 W^ 1.297-7,776/100 m^ 

 n > 7,777/100 m^ 



Figure 2. — Abundance of the hydromedusan Aglantha digitale con- 

 toured in powers of 6 per 100 m^. 



16<**W 



l-FATHOM LINE 



I I ABSENT 

 I [ 1-9/100 m3 

 I 1 10-27/100 m' 

 ^ 28-81/100 m3 

 @ > 82/100 m^ 



Figure 3. — Abundance of chaetognath Sagitta elegans contoured in 

 powers of 3 per 100 m^. 



10-FATHOM LINE 



ALASKA 

 I I ABSENT 



I I 1-27/100 m' 59<'N- 



I i 28 81/100 m^ 

 ^ e2-2i4VtOO m^ 

 B 211 729/100 m^ 

 H > 730 100 m^ 



Figure 4. — Abundance of pteropod Clione limacina contoured in pow- 

 ers of 3 per 100 m'. Presence of Spiralella limacina indicated by X. 



10 



