Table 3-1. Metal Levels in Mytilus Edulis 
Cd 
Pb 
Ni 
Cu 
Cr 
V 
Zn 
Lab-held 
2.89 
9.7 
5.7 
8.5 
2.35 
10.7 
170 
41 specimens 
.78 
1.9 
1.6 
2.2 
1.52 
4.3 
52 
(time = 0) 
(40) 
(10) 
(19) 
(41) 
(41) 
(22) 
(41) 
Stressed 
3.04 
12.6 
15 
19 
3.76 
10.5 
199 
10 specimens 
.65 
10.8- 
3.69 
2.8 
.69 
4.7- 
83 
15.5 
11.4 
(time = 4 weeks) 
(10) 
( 4) 
(10) 
(10) 
(10) 
( 5) 
(10) 
Unstressed 
2.42 
7 
9.1 
12 
2.53 
8.4 
149 
10 specimens 
.47 
7 
2.7 
1.4 
.50 
6.4- 
22 
11.5 
(time = 4 weeks) 
(10) 
( D 
(10) 
(10) 
(10) 
( 5) 
(10) 
Metal levels in Mytilus edulis expressed above in ug/g dry weight as: 
Mean 
Standard deviation or range 
(no. of organisms above detection limit) 
Copper levels in Mytilus are significantly higher in that group of animals 
from polluted Station 2 than either Station 3 or laboratory-held animals. 
However, the latter two animal groups have statistically similar levels. Copper 
data show a sharp drop from the polluted area to the levels in both lower Bay 
groups (Figure 3-4). 
Chromium levels in Mytilus from the three stations are not significantly 
different (Figure 3-4). 
Vandium levels were above detection in only about one-half of the 
individuals collected from each station. While the data are too sparse for 
statistical analysis, no difference between the levels at the three stations is 
apparent (Figure 3-4). 
Variability in levels of Zn is so great within each station that meaningful 
comparison between stations is not possible. 
34 
