120 
Fishery Bulletin 113(2) 
2 
6 2 4 6 
Distance (km) 
Appendix Figure 
Sample and fitted semivariograms of spiny dogfish ( Squalus acanthias) catch 
per unit effort in the northeast U.S. shelf large marine ecosystem between 1989 
and 2009 for the sink gillnet fishery in (A) autumn and (B) spring, the ot- 
ter trawl fishery in (C) autumn and (D) spring, and the Northeast Fisheries 
Science Center bottom trawl survey in (E) autumn and (F) spring. Note that 
ranges on x- and y-axes differ between panels. 
