Table 14 « Comparison of mean values of zooplankton volume a temperature 

 at 10-meter depth, depth to the 70° isotherms and surface in- 

 organic phosphate for four cruises in Hawaiian waters <> 



such a relationship o Correlation of zooplankton volumes resulting from 

 200-meter oblique hauls and percent saturation of oxygen at the 10-meter 

 depth gave a correlation coefficient (r) of — 0ol47 (table 11) o Correla- 

 tion of zooplankton with oxygen at 100 meters gave an "r" value of 

 — 0.024«, These coefficients are well below the level of statistical 

 significance and indicate an almost complete lack cf correlation between 

 the two variables o The fact that negative coefficients ^ such as had been 

 obtained for the equatorial region^ were derived in both instances is of 

 interesto 



Temperature - Salinity Relations 



Sverdrup et alo (1942s, po 740} show the Hawaiian Islands to be 

 located near the junction of three different water masses of the central 

 Pacific, The authors state that "oooothe region around the islands is 

 a boundary region within which water masses of very different character 

 may be encounteredo" One means of identifying a particular water mass 

 is by its temperature-salinity relations or "T-S" curve o 



It would seem possible that a change in plankton or pelagic 

 fish abundance might follow a change of the water mass bathing the Is- 

 leindso during the summer and fall of 1951 a significant change was noted 

 between the zooplankton volumes collected on Smith cruise 10 in July and 

 those of Smith cruise 12 in October » A comparison of the T-S curves 

 for these two cruises with those shown in Sverdrup et alo (1942, p, 741) j 

 indicates that during the time of both cruises the Islands lay in the 

 "Eastern North Pacific Central Water Mass". The change in zooplankton 

 abundance v;as, therefore, not a reflection of a change in water mass as 

 indentified by the T-S curve o 



46 



