68 



Fishery Bulletin 90(1). 1992 



Annual solar insolation (variable 5) has high values 

 at the earth's Equator, with decreasing values as one 

 proceeds toward either pole. Only two morphological 

 variables have significant correlations with this envi- 



W Tempoial Fossa 



144 mm 

 394 

 349 



1 ' 



Figure 1 1 



Geographic variation in (A) W. Temporal Fossa and (B) Water Depth. Darkened part 

 of bar indicates value for particular block. 



ronmental factor (Table 7), each of which are negative 



and relatively weak. 

 The sixth environmental variable. Sea Surface Temp. 



(Jan.), has significant negative correlations with 22 

 morphological characters, as well 

 as principal component I (Fig. 4) 

 and canonical variable 1 (Fig. 

 8B). Variable 7, which is Sea Sur- 

 face Temp. (July) (Fig. 12), has a 

 relatively high number (21) of 

 significant negative associations 

 i7^:;>^ with morphological measures, as 



— LX^ v,'\ well as with principal component 



I (Fig. 4) and canonical variable 

 1 (Fig. 8B). Postorbital W. (Fig. 

 8A) has the strongest correlation 

 (-0.681) of any of the morpho- 

 logical characters with Sea Sur- 

 face Temp. (July). 



The eighth environmental vari- 

 able. Sea Surface Temp. (Ann. 

 Var.), exhibited relatively weak 

 geographic concordance with six 

 morphological characters, one of 

 which was a negative association 

 (Table 7). Also, only weak nega- 

 tive correlations of five morpho- 

 logical variables were found with 

 depth of the oxygen minimum 

 layer (variable 9). 



Fourteen of the 30 morpholog- 

 ical measures are significantly 

 correlated with environmental 

 variable 10, Surface Salinity (Fig. 

 13B). In addition to east-west 

 changes from lower to higher 

 values at a given latitude, salin- 

 ity also exhibits a north-to-south 

 trend of increasing values (below 

 15 °N). The highest correlation 

 (0.661) is with L. Braincase (Fig. 

 ISA). 



Thermocline Depth (Winter), 

 variable 11, was positively asso- 

 ciated with 13 morphological 

 variables (Table 8), while Thermo- 

 cline Depth (Summer), variable 

 12, has statistically significant 

 positive correlations with 11 

 morphological traits. The final 

 variable, Surface Dissolved Oxy- 

 gen, covaries with 16 morpholog- 

 ical variables. As suggested in 

 the dendrogram in Figure 9, this 

 environmental variable has a 



