282 



ZUBARIK AND O'CONNOR 



14,000 



1 2 3 4 5 6 7 



TIME, days 



Fig. 1 Methyl mercury uptake by Gammarus sp. over a period of 1 

 week. Each point represents the mean of three replicates. Activity 

 ratio = dis min~ g~' organism per dis min~* g^' in the w^ater at 

 the end of the experiment. 



4,000 



3,000 — 



< 



> 



CJ 



< 



2,000 



1,000 — 



3 4 5 6 7 8 



TIME, days 



Fig. 2 Mercuric chloride uptake by Gammarus sp. over a period of 

 1 week. Each point represents the mean of three replicates. 



