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CH3041
DDT IV
• In Australia problems in the natural
environment were observed in the 1970s
and this helped to lead to the ban on DDT.
environment were observed in the 1970s
and this helped to lead to the ban on DDT.
• Birds of prey
were hard hit with reproduction
seriously affected as
DDE causes egg-shell failure.
DDE causes egg-shell failure.
• Levels of DDT have now
declined around the globe
and are relatively constant
in most developed areas
- but they are not zero.
declined around the globe
and are relatively constant
in most developed areas
- but they are not zero.
• Mussels are a convenient bioindicator:
USA : 1970 0.024 ppm 1986 0.003 ppm
USA : 1970 0.024 ppm 1986 0.003 ppm
Australian falcons
eggshell thickness
eggshell thickness
