BODY LENGTH AND BODY WEIGHT OF STENELLA AND DELPHINUS 



Régression coefficient b 



815 



Origin of ordinates a 

 Régression line 



Standard déviation of the 

 individual values about the 

 régression line 



Standard of the régression 

 coefficient 



Signficance test 

 t P : N — 2 



Significance level 



P= 5°/ 



= S xy : S xx (corresponds to the factor n 

 of Schultz, 1938) 



= y — bx (corresponds to the factor F 

 of Schultz, 1938) 



Y = a + bx (corresponds to 



log W = log F -f («) (logL) 

 Schultz, 1938) 



1 



= s Y = 



N— 2 



74 



[S yy S xy : S xx ] 



S y '■ S xx 



t b = b :s b 



The values obtained for Stenella styx and Delphinus delphis are set out in 

 able 2. 



Table 2 



Species 



X 



y 



6 



a 



Sy 







significance 

 N level 



P = 5% 



teneïïa 



2.2309 



1.7256 



2.6104 



—4.0982 



0.0515 



0.4266 



6.1189 



12 + 



styx 



ïelphinus 

 delphis 



2.2233 



1.6838 



2.3569 



—3.5565 



0.0463 



0.1957 



12.0436 



24 + 



For both Stenella and Delphinus it was found that régression coefficient 

 /hich represents the slope of the straight line, is significant at a significance level 

 f p = 5%. The value obtained for Stenella was 6 = 2.6104 (= 69°0') and for 

 delphinus, b = 2.3569 (= 67°0'). The équations for the straight Unes, in terms 

 f logarithms, are as follows : 



for Stenella : log y = —4.0982 + (2.6104) (log x) 

 for Delphinus: log y = —3.5565 + (2.3569) (log x). 



Both lines are slightly flatter than those obtained by Schultz, whose spécimens 

 'ère mostly whalebone whales, and by Sergeant for Globicephala melaena, that 



