QUAST: MORPHOMETRIC VARIATION ON PACIFIC OCEAN PERCH 



ATKA-B , ATKA-G| KOD 



YAK 



SE 



REGION 

 VAN ATKA-B, ATKA-G, KOD , YAK 



39 



38 



37 



36 



'i 



B 



DC 

 ^ 35 



O 

 < 



cr 

 < 

 I 

 33 



LU 

 N 



W 32 



Q 



LU 



O 



Q 



m 31 



cr 



Q. 



O 



-O 



o- 



A7. UPPER-JAW LENGTH 



O 



o 



30 



29 



28 



O 



-O 



o 



o 



^■9- 



t> 



-o 



[> 



o 



O. SYMPHYSEAL KNOB 



SE 



VAN 



13 

 12 

 1 1 



5.3 

 5.2 

 5.1 

 5.0 

 4.9 

 4.8 



4.7 

 4.5 

 4.4 

 4.3 



4.2 

 4.1 



f* w ,, E*3 



N. UPPER-JAW WIDTH 



P 



-O 



o 



o 



--0 



p. 6**^ SPINOUS RAY 

 IN DORSAL FIN 



•o 



Figure 2.— Continued. 



graphic variation was significant but erratic in 

 this index to height of the spinous dorsal fin. 

 Kodiak specimens had the highest spinous dor- 

 sal fins, on average. Sexual variation was in- 

 consistent and is probably unimportant. 



13th spinous ray in dorsal fin (Fig. 2Q). — Geo- 

 graphic variation was significant but erratic in 

 this index to height of the notch between 

 spinous and soft dorsal fins. Sexual dimorphism 

 seems generally unimportant. 



3d anal-fin spine (Fig. 2R). — Geographic and sex- 

 ual variation in length of the spinous ray was 

 minor, except that the fin spine was unusual- 

 ly short in females from the Southeastern 

 region. 



The measurements (as related to the standard- 

 ized fish of 260 mm SL) usually varied geograph- 

 ically either in generally monotonic clines over 

 the study area (Atka-Bering to Vancouver re- 

 gions) or V-shaped clines that were broken in the 

 Yakutat or Kodiak region. Only two sets of char- 

 acters varied almost monotonically, and varia- 

 tion within each can be ascribed to a progressive 

 shift in boundary features for body regions: 

 Length of nape generally decreased and length of 

 the spinous-dorsal fin increased from southeast to 

 northwest (Fig. 2A, B), probably because of a rela- 

 tional shift in the dorsal-fin insertion. Belly size 

 increased from southeast to northwest (Fig. 2E), 

 probably because the pectoral girdle and associ- 



673 



