FISHERY BULLETIN: VOL. 82, NO. 2 



*74°00 



^42°00' 



76°00 



CAPE HAT TERAS 



3 6° \. 



7 4° 00 



\ 



FIGURE 6. — Pooled site groups based on cluster analysis for fall NMFS Groundfish Survey cruises, 1967-75. 



III). The remaining site groups could be classified 

 as outer shelf-shelf break (group IV) or upper slope 

 (group V). The outer shelf-shelf break group dis- 

 played a wide depth range and a temperature 

 range very similar to groups II and III, but oc- 

 curred consistently offshore of those two groups 

 (Fig. 6). The upper slope group had the most re- 

 stricted temperature range and was bathymetri- 

 cally discrete from the inner- and mid-shelf 

 groups. The temperature-depth envelopes for the 

 first four site groups (Fig. 7) show a large amount 

 of overlap in the shallower portion of the study 



area, but much of this overlap is an artifact of 

 combining data across years and over a wide area 

 (i.e., thermal ranges and boundaries between 

 groups varied between years, and bathymetric 

 boundaries varied with latitude). 



Species Associations 



Between 6 and 11 species clusters were recog- 

 nized for each cruise (Colvocoresses and Musick 

 1979). As with the station clusters, although there 

 was some variation in group composition and dis- 



304 



