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Decline in PCB levels in otters (Lutra lutra)
1Department of Biological Sciences, University of Essex, Colchester, UK.
Chemosphere
|April 9, 1998
Summary
Total polychlorinated biphenyl (PCB) levels in otters (Lutra lutra) from England and Wales have declined significantly. Current mean PCB levels are unlikely to threaten otter populations, indicating a positive environmental recovery trend.
Area of Science:
- Environmental Science
- Ecotoxicology
- Wildlife Biology
Background:
- Polychlorinated biphenyls (PCBs) are persistent organic pollutants with known toxic effects.
- Otters (Lutra lutra) are sensitive indicators of aquatic ecosystem health.
- Historical PCB contamination posed a significant risk to European wildlife.
Purpose of the Study:
- To assess the trend of total PCB levels in otter tissues from England and Wales.
- To determine if current PCB levels in otters pose a threat to population viability.
Main Methods:
- Analysis of PCB concentrations in otter tissues collected between 1983 and 1992.
- Statistical analysis to determine the annual rate of change in PCB levels.
Main Results:
- A consistent decline in total PCB levels in otter tissues was observed.
- The average annual decline in PCB levels was 8% over the study period.
- Mean PCB concentrations have reached levels unlikely to endanger otter populations.
Conclusions:
- PCB contamination in England and Wales has decreased, as evidenced by otter tissue analysis.
- Otter populations in England and Wales are showing signs of recovery from PCB pollution.
- Continued monitoring is recommended to ensure sustained environmental health for otters.