260 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



The analysis of vai-iance of the logarithms of 

 the adjusted rankings of meristic characters 

 follows : 



Character index 



Branchiostegals 



Pyloric caeca _ 



Anal and dorsal fin rays 



Rakers on first gill arch. 



Vertebrae and lateral-line scales.. 



Oblique and dorsal to lateral-line scale counts. 



Mean square 



Between 

 genera 



0. 2594 

 .4210 

 ,5256 

 .2171 

 .0430 

 .2657 



Within 

 genera 



0. 0438 

 .0229 

 .0203 

 .0421 

 .0808 

 .0510 



F 

 value 



5.92* 

 18. 38" 

 26. 89" 



5.16* 

 .53 



5.21* 



For five of the six meristic indices, the variance 

 within is significantly less than the variance be- 

 tween genera. This tends to confirm the validity 

 of the generic groupings as established even though 

 it does not yield much information concerning 

 affiliations of particular species. 



To show the relationships between species, both 

 the maximum and the average differences in the 

 logarithms of the six meristic indices are given 

 for 16 species in table 30. 



The interrelationships of the various species as 

 shown by these meristic indices are depicted in 

 figure 13. The genus Oncorliynchus is quite well 

 separated from the other genera except for a close 

 link between 0. kisutch and Salmo gairdneri. 



Cristivmner sliows a loose affinity with Salve- 



Vmu.s alpinus and remote connections with several 

 other species. 



Salvelinus is a rather closely knit group, with S. 

 marstoni the closest link between Salmo gairdneri 

 and the other Salvelinus. 



ONCORHYNCHUS 



_ — T 6 ) CRISTIVOMER 



SALVELINUS 



AVERAGE LOG DIFFERENCE 

 I BELOW 16 



I 16-0,20 



021-025 



26-0 30 



MAXIMUM LOG DIFFERENCE 

 EXCEEDS 60 



I 



Figure 13. — Relation.ships of species of Salmonidae, as 

 shown by meristic indices. (See table 30 for key to 

 species' numbers in circles. 



Table 30. — Differences between logarithms of six meristic indexes, average differences between species (lower left), 



maximum differences (upper right) 



' Figures in parentheses show number of comparisons when less than 6. 



