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Diagnostic brain residues of dieldrin: Some new insights

OCLC: 8238044
By:
and
Edited by:
D.W. Lamb and E.E. Kenaga
DOI: 10.1520/STP28373S

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Abstract

Forty adult male cowbirds were fed a diet containing 20 ppm dieldrin; 20 of the birds were randomly selected to die from dieldrin poisoning and 20 were sacrificed when dieldrin had made them too sick to eat. An average of 6.8 ppm dieldrin (range of 1.51 to 11.7) in the brain on a wet-weight basis was associated with a treatment-related cessation of feeding, whereas an average of 16.3 ppm (range of 9.84 to 23.5) was found in the brains of birds that died from dieldrin poisoning; the latter concentrations agreed with those determined in other studies. Dieldrin-induced starvation was generally irreversible; therefore, brain levels of dieldrin that are clearly sublethal may nevertheless present a grave hazard to birds by initiating a process that leads to death. Fatter cowbirds were able to survive longer on dieldrin treatment but contained brain residues similar to those in cowbirds that died sooner. Some cowbirds survived for 2 months or longer with unexpectedly large amounts of body fat remaining when they died or were sacrificed. Fatter cowbirds also survived longer after they had stopped eating.

Additional Publication Details

Publication type:
Book chapter
Publication Subtype:
Book Chapter
Title:
Diagnostic brain residues of dieldrin: Some new insights
Series number:
757
DOI:
10.1520/STP28373S
Year Published:
1981
Language:
English
Publisher:
American Society for Testing and Materials
Publisher location:
Philadelphia, Pa
Contributing office(s):
Patuxent Wildlife Research Center
Description:
164
Larger Work Type:
Book
Larger Work Subtype:
Other Government Series
Larger Work Title:
Avian and Mammalian Wildlife Toxicology, Second Conference: a symposium
First page:
72
Last page:
92