1000 — 
h- 
x 
O 
LU 
>- 
or 
Q 
CL 
CL 
Cu Ni Pb 
MERCENARIA 
Figure 3-2. Metal levels in indigenous Mercenaria mercenaria from 
clean and polluted parts of Narragansett Bay, Rl. 
Note: Range shown is one standard deviation on either side of the mean. 
The mussels used in this study were collected at one time from off 
Popasquash Point, Narraganasett Bay, R.I. (Figure 3-1), and held in a 
laboratory flow-through system for six days prior to the First deployment. 
29 
