Lead and mercury accumulation or depuration in
parts per million dry weight (ppm) in three transplanted
bivalve species for ten sampling periods from 1993ยจ1997.
Initial (T-0) concentrations are subtracted
from tissue concentrations after retrieval to give
concentrations accumulated or depurated (negative
value) during deployment in the Estuary. Bars indicate
the range of values of all stations where species
were deployed. Note different y-axis scales.