Table 3-1. Metal Levels In Mytilus edulis 



Metal levels \x\ Mytilus edulis expressed above in ug/g dry weight as: 



Mean 



Standard deviation or range 



(no. of organisms above detection limit) 



Copper levels in M. edulis 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 M. edulis from the three groups are not significantly 

 different (Figure 3-4). 



Vanadium 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 



