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The significance of pesticide residues in the environment

Residues derived from the organochlorine insecticides DDT, aldrin, dieldrin and heptachlor were widespread in the living environment during the 1960s, with particularly high levels being found in a number of predatory species. The reasons for this distribution pattern and the significance of the residue levels found are discussed. One outcome of the study of organochlorine pollution has been a growth of interest in better methods for determining the undesirable side effects of pesticides.