FISHERY BULLETIN: VOL. 82, NO. 2 





A 



' 



74°00' 



42°00 



76°00' 



36°00 



36°00' 



71°00^ 



FIGURE 4.— Pooled site groups based on cluster analysis for spring NMFS Groundfish Survey cruises, 



1968-76. 



tortions introduced by misclassified stations, 

 points which exceeded 2 standard deviations from 

 either mean were not included. As may be seen by 

 a comparison of Figures 4 and 5, groups I and IV 

 are geographically, bathymetrically, and ther- 

 mally discrete from one another with groups II and 

 III occupying the intermediate area and somewhat 

 overlapping the first two groups in terms of 

 bathymetry and thermal regime. Groups II and III 

 are largely separable on the basis of latitude (as 

 well as faunal composition). 



Fall Cruises 



Station groups recognized from cluster analysis 

 of the fall cruises (Colvocoresses and Musick 1979) 

 were not as geographically contiguous or as ther- 

 mally restricted as during the spring cruises, but 

 could still be readily grouped into categories based 

 on faunal attributes. During seven of the nine 

 cruises there was a distinct southern inshore site 

 group between shore and about 60 m extending 

 from Cape Hatteras northward to the region off 



302 



