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Long-term impacts of the Exxon Valdez oil spill on sea otters, assessed through age-dependent mortality patterns

Proceedings of the National Academy of Sciences of the United States of America

By:
, , , ,
DOI: 10.1073/pnas.120163397

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Abstract

We use age distributions of sea otters (Enhydra lutris) found dead on beaches of western Prince William Sound, Alaska, between 1976 and 1998 in conjunction with time-varying demographic models to test for lingering effects from the 1989 Exxon Valdez oil spill. Our results show that sea otters in this area had decreased survival rates in the years following the spill and that the effects of the spill on annual survival increased rather than dissipated for older animals. Otters born after the 1989 spill were affected less than those alive in March 1989, but do show continuing negative effects through 1998. Population-wide effects of the spill appear to have slowly dissipated through time, due largely to the loss of cohorts alive during the spill. Our results demonstrate that the difficult-to-detect long- term impacts of environmental disasters may still be highly significant and can be rigorously analyzed by using a combination of population data, modeling techniques, and statistical analyses.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Long-term impacts of the Exxon Valdez oil spill on sea otters, assessed through age-dependent mortality patterns
Series title:
Proceedings of the National Academy of Sciences of the United States of America
DOI:
10.1073/pnas.120163397
Volume
97
Issue:
12
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
6562
Last page:
6567
Number of Pages:
6