COPPER SENSITIVITY OF ADULT PACIFIC OYSTERS 



307 



50 100 150 200 50 



ADJUSTED EXPOSURE TIME, hr 



100 



150 



200 



Fig. 1 Cumulative mortality of adult oysters continuously exposed 

 to copper, (a) Experiment 3. (b) Experiment 4. Exposure time was 

 adjusted by the ratio of amount of time the shells were opened to 

 the time closed. Numbers on the curves are copper concentrations in 

 micrograms per liter. 



>- 



DC 



o 



55 

 O 

 ID 



0.2 



0.3 0.4 0.5 0.6 

 COPPER, A(g/ml 



0.8 



1.5 



Fig. 2 Toxicity curve for adult oysters continuously exposed to 

 copper based on data from experiments 3 and 4 with adjusted 

 exposure times. The least square equations for this line are Y = 

 6.3595- 1.6619X and r^ = 0.9645. The dashed lines (= = = =) 

 indicate ±95% confidence limits around the x value. 



