Figure 5. — Abundance of the copepod Acartia longiremis contoured in 

 powers of 3 per 100 m '. 



Figure 6. — Abundance of the copepod Calanus finmarchicus con- 

 toured in powers of 4 per 100 m^. 



■ 10 FATHOM LINE 



I I ABSENT 



I 1 10-27/100 m' 

 ^ 28-81/100 m' 

 H 82-243/100 m^ 



Figure 8. — Abundance of the copepod Eucalanus bungii contoured in 

 powers of 3 per 100 m^. 



Figure 9. — Abundance of the copepod Pseudocalanus minulus con- 

 toured in powers of 3 per 100 m^. 



finmarchicus or C. abdominalis. but the density con- 

 tours (Fig. 6, 7) show that the portions of each area 

 having zero counts were separated by a band of mod- 

 erate density along the probable boundary of the north 

 and south areas. Eucalanus bungii (Fig. 8) had a simi- 

 lar density distribution, in which statistically signifi- 

 cant differences were found between means of the 

 south area and the west and north areas but not be- 

 tween the west and north areas. However, the differ- 

 ence in the mean for E. bungii in the west and north 



areas is quite large (?' = 2.217 vs. t'^^ , 



2.224), and 



Figure 7. — Abundance of the copepod Centropages abdominalis con- 

 toured in powers of 3 per 100 m''. 



the difference of variance is significant (F = 18.26 vs. 

 Fo.9995 = 8.14). Pseudocalanus minutus varied from 

 the other calanoid copepods in that the higher mean 

 density for the west area (90 per 100 m^) was not statis- 

 tically different from that for the south area (16 per 100 

 m^) but did differ from that for the north area (9 per 100 

 m^). The density contours of P. minutus (Fig. 9) show 



11 



