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Project Information

Title: Eagle Damage Assessment Closeout

Project Year and Number: 1992: B04

Other Fiscal Years and Numbers for this Project: 1991: B04, 1990: B04, 1989: B04

Principal Investigator (PI): Tim Bowman, US Fish & Wildlife Service

Assisting Personnel: Jeffrey Bernatowicz, Philip Schempf

Research Location: All Spill Affected Areas

Restoration Category: Damage Assessment

Injured Resources Addressed: Bald Eagles

Abstract: Surveys were conducted following the oil spill to estimate bald eagle numbers and reproductive success of eagles residing in the Exxon Valdez oil spill area. Eagles were radio-tagged and monitored to determine survival, and document movements and exposure to oiled areas. Toxicological tests were conducted on tissue samples, and addled eggs, prey remains, blood, and feathers were collected and analyzed for evidence of hydrocarbon exposure.

Preliminary results have shown that oil contamination of the intertidal habitats used extensively by breeding, wintering and migrating bald eagles have resulted in impacts to these birds. Conservative estimates of total mortality of bald eagles due to Exxon Valdez oil spill is 553 eagles. Bald eagle nesting surveys revealed a significantly low nest success and productivity in Prince William Sound with approximately 69% of occupied nests failing in 1989 and 43% failing in 1990. A conservative estimate of lost production in 1989 was 133 chicks. Hydrocarbon analysis of addled eggs, prey remains, blood, and feathers in 1989 and 1990 indicated exposure. Two of 3 eggshell samples collected in 1989 on the Alaska Peninsula and Kodiak area were exposed to hydrocarbons. Concentrations of uric acid in blood serum from adult eagles in oiled areas were higher than those from unoiled areas in 1989. Eggs collected in 1990 in eastern Prince William Sound also indicated exposure to petrogenic hydrocarbons.

A preliminary report of results has been prepared for this study but comprehensive data synthesis and analysis have not been completed. The preparation of a final report will be essential for understanding the injuries the spill caused to bald eagles. If this information is not clearly and completely available to those responsible for restoration, it will not be possible to adequately address the restoration needs of the resource.


Keywords

Geographic Regions Prince William Sound
Fields of Expertise Contaminants/Toxicology
Ecology
Technological Methods Radio Tagging
Tissue sampling/biopsy

Proposal: PDF Not Available

Funding Recommendations: View

Funding Detail For: 1992

Quarterly Project Tasks For: 1992

Annual Report: 1992: Not Applicable

Final Report: View

Publications from this Project: None Available

More information may be available for this project under other years:

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Project Number Proposal Annual Reports Final Report Data
1991: B04 Not Available 1991: Not Applicable
See Project B04 See Project B04
1990: B04 Not Available 1990: Not Applicable
See Project B04 See Project B04
1989: B04 View (PDF) 1989: Not Applicable
See Project B04 See Project B04