water we also waded and used self-contained underwater breathing 

 apparatus (SCUBA) . 



PERMANENT SAMPLING TRANSECTS 



In June 1984, five permanent transects were laid out and 

 sampled in the fleeting site (Figure 2) and one transect in the 

 control site (Figure 1) to determine whether mussel densities, 

 species composition, size distribution, and shell damage initially 

 differed between the fleeted and control sites. Permanent 

 transects will allow us to relocate sampling points for long-term 

 monitoring of the mussel beds after our short-term, manipulative 

 experiment is completed. 



To lay out a transect, the diver screwed a 1.2-m steel ground 

 anchor, normally used to anchor house trailers against wind, into 

 the bottom. He then attached one end of a 110-m rope to the 

 anchor and a float to the opposite end. The float was allowed to 

 move downstream in the current. The pontoon boat and diver then 

 moved downstream to the float, and another anchor was set by the 

 diver. Both upstream and downstream anchors were marked with 

 additional floats. The diver identified individual ground anchors 

 by the number of notches ground into the top of each one. We 

 designated transects by the ground anchors that marked them. 

 Thus, the transect running from ground anchor 3 to ground anchor 2 

 was transect 3-2 (Figure 2) . Positions of the ground anchors were 



