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DDT residues in starlings, 1974.
Pesticides Monitoring Journal
|June 1, 1975
Summary
The 2024 starling collection shows a 36% reduction in dichlorodiphenyltrichloroethane (DDT) levels, but the mean of 0.282 ppm remains above the predicted 0.1 ppm target. Initial findings suggest earlier DDT disappearance estimates were optimistic.
Area of Science:
- Environmental Chemistry
- Wildlife Toxicology
- Pesticide Monitoring
Background:
- Previous research predicted dichlorodiphenyltrichloroethane (DDT) levels in starlings to fall below 0.1 ppm for the 1974 collection.
- Predictions were based on the relationship between DDT and its metabolites in starlings and domestic DDT disappearance estimates.
Purpose of the Study:
- To summarize initial findings from the 1974 starling collection regarding DDT levels.
- To evaluate the accuracy of earlier predictions for DDT reduction.
Main Methods:
- Analysis of mean levels of DDT and its metabolites in starling collections.
- Comparison of 1974 geometric mean levels with 1972 data and previous predictions.
Main Results:
- The geometric mean level of DDT plus metabolites in the 1974 starling collection was 0.282 ppm.
- This represents a 36 percent reduction from the 1972 mean level of 0.442 ppm.
- The observed 1974 mean level exceeded the predicted target of below 0.1 ppm.
Conclusions:
- Earlier estimates for the disappearance of total DDT were overly optimistic.
- Continued monitoring of DDT levels in wildlife is crucial for assessing environmental contamination and the effectiveness of reduction strategies.