Sanchez et al: Morphometry of juvenile and subadult Loligo pealei and L plei 



541 



used in statistical analyses ranged in size from 50.0 

 to 147.0 mm and females from 64.0 to 140.0 mm ML. 

 Results of statistical analyses of tests of sexual di- 

 morphism for characters and indices are shown in 

 Table 4. 



Coefficients of determination (r 2 ) were high for both 

 males and females for AL, FCL, FL, GW, NCL, RW, 

 and W when regressed on mantle length. The slopes 

 of the regression lines were similar between sexes 

 for W and GW, but females were heavier than males 

 (Fig. 4) and had a broader gladius (Fig. 5). There 

 were also no significant differences between males 

 and females in the slopes of the regression lines for 

 AL, FCL, FL, NCL, and RW, and the 95% confidence 

 intervals of the regression intercepts overlapped. Fin 

 width was highly correlated with ML only in females. 

 Overlap occurred in all measured characters. 



Significant differences were found in the slopes of 

 the regression lines only for W/ML. With the excep- 

 tion of W/ML in females, all indices had low coeffi- 

 cients of determination. Means of the indices of FW/ 

 ML, GW/ML, GW/RW, and RW/ML were significantly 

 higher in females than in males; however, overlap 

 was high. 



Loligo plei Sex could be determined for 51% of the 

 specimens identified as L. plei (n-73). Males used in 

 statistical analyses ranged in size from 52.0 to 107.0 

 and females from 46.0 to 101.0 mm ML. Results of 

 statistical analyses of tests of sexual dimorphism for 

 characters and indices are shown in Table 5. 



No significant differences were found between the 

 sexes in the slopes of the regression lines for any of 

 the characters. Weight (Fig. 6) and GW (Fig. 7) were 

 highly correlated to ML in both males and females; 

 however, there was no significant difference in the 

 slopes of the regression lines, and the 95% confidence 

 intervals of the regression intercepts overlapped. 

 Females were heavier than males of similar length, 

 and the gladius was broader in female specimens. 

 Fin length and RW were also highly correlated with 

 ML but, as with W and GW, there was no significant 

 difference in the slopes of the regression lines and 

 the 95% confidence intervals of the regression inter- 

 cepts overlapped. Fin width, FCL, and NCL were 

 highly correlated with mantle length only in males. 



With the exception of FCL/ML in males, all indi- 

 ces had low coefficients of determination. There were 

 significant differences in the means of FW/FL, 



