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DDT RESIDUES IN ROBINS AND EARTHWORMS ASSOCIATED WITH CONTAMINATED FOREST SOILS1

Published online by Cambridge University Press:  31 May 2012

John B. Dimond
Affiliation:
Maine Agricultural Experiment Station, University of Maine, Orono
Glenn Y. Belyea
Affiliation:
Maine Agricultural Experiment Station, University of Maine, Orono
Raymond E. Kadunce
Affiliation:
Maine Agricultural Experiment Station, University of Maine, Orono
A. Stanley Getchell
Affiliation:
Maine Agricultural Experiment Station, University of Maine, Orono
John A. Blease
Affiliation:
Maine Agricultural Experiment Station, University of Maine, Orono

Abstract

Residue analysis of forest soils sprayed once at 1 lb/acre showed little breakdown of DDT through 9 years after application. In the absence of appreciable downward trend, residue persistence could not be estimated beyond stating that it appears to persist much longer than the 10 years suggested by others. Persistent residues are largely restricted to the upper soil litter. Residues pass from soils to earthworms to robins throughout the 9-year period studied. It is suggested that this relationship may persist for as long as 30 years after a single application to the forest. Biological magnification of residues in robins is demonstrated. Significance of these residue levels is discussed.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1970

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