rn < 5ecc/i,oooM' 



I I 5 8-24.6 CC./l,000 M? 

 H] > 24.6CC./I,000M' 



^- 



Figure 5. --Density of zooplankton around Oahu, 

 May 7-11, 1956 (HMS-34, upper net). 



r~| < I lOCC/ipOOM? 

 [~~| I I 0-208 CC,/l,OOOM' 

 j~2] > 20 8 CC./ipOO M' 



vv. r^C 



Figure 7. --Density of zooplankton around Oahu, 

 November 7-10, 1956 (HMS-36, upper net). 



l^-M < 12.1 CC./1,000M? 

 123 12.1-28.5 CC./l,OOOM? 

 ^1 > 28 5CC./I.000M? 



■ 'a 



Figure 6. --Density of zooplankton around Oahu, 

 August 1-6, 1956 (HMS-35, upper net). 



est hauls of each cruise. Areas with densities 

 greater than the average plus one standard de- 

 viation were designated as "rich" and those 

 with densities less than the average minus one 

 standard deviation as ''poor." No particular 

 area was consistently "rich" or "poor." 



Seasonal Distribution 



The Smith cruises were scheduled at 3-month 

 intervals. Seasonal variations in abundance ot 

 zooplankton were indicated by the variation in 

 catches in the upper net during the different 

 cruises (table 7). 



The average volumes of zooplankton for the 

 upper stratum, both unadjusted (table 4) and ad- 

 justed (table 8). show that abundance of zoo- 

 plankton was greater in the winter (HMS-32) 

 and summer (HMS-35) than in the spring (HMS- 

 34) and fall (HMS-36). In contrast. King and 



Table 8. --Analysis of variance of adjusted volumes of zooplankton (cc. per 1,000 m.-') in 

 different seasons for the upper net of the Smith cruises [n = number of samples; 

 X = average volume; s = standard deviation; F = statistic for testing hypothesis; 

 P = probability] 



Item 



n 



X 



s 



Cruise and month (1956) 



HMS-32 

 Feb. 



HMS-34 

 May 



HMS-35 

 Aug. 



43 



23.3 

 6.8 



45 

 15.2 

 9.4 



45 



20.3 

 8.2 



HMS-36 

 Nov. 



44 

 15.9 

 4.9 



Treatment of data 



Source of 

 variation 



Degrees of 

 freedom 



Sum of 

 squares 



Mean 

 square 



Total 



Season means 

 Individuals 



176 

 3 



173 



11,715.60 

 1,923.66 

 9,791.94 



641.22 

 56.60 



11.3 



<0.01 



