COLVOCORESSES and MUSICK: CONTINENTAL SHELF DEMERSAL FISHES 



A 



SITE GROUPS 



co B 



Q- 



O 

 K 

 <S> 



v> C 



UJ 



o 



UJ 



w D 



E 



wmmr 



CONSTANCY 



| 2 70 % 

 Very High 



bi 



S > 50% 



High 



f^j > 30% 

 Moderate 



D > l0% 



Low 



] < 10% 

 Very Low 



B 



FIGURE 10.— Nodal constancy (A) and 

 fidelity (B) diagrams showing the inter- 

 relation between pooled site and species 

 groups. NMFS Groundfish Survey fall 

 cruises, 1967-75. 



SITE GROUPS 



nr m 



CO 

 0- 



o 

 o 

 cc 

 o 



CO 

 UJ 



o 



UJ 

 0. 

 CO 



FIDELITY 



) 2 2 



Highly Positive 



> I I 



Positive 



> 09, < I I 



Neutral 



< 09 

 Negative 



] <_ 045 

 Highly Negative 



FALL CRUISES 



TABLE 5. — Dominant species by site group for Fall NMFS Groundfish Survey cruises, Mid-Atlantic Bight area, 

 1967-75. A species was considered dominant if it occurred among the five most abundant species at at least 

 20'/r of all stations in the site group. Figures given are percentage of stations within each site group at which 

 a species occurred (% ) and the average percentage that the species contributed towards total abundance of 

 nonpelagic fishes (x9c ) within the site group. Faunal affinities and species groups are as given in Table 3. 



309 



