Effects of food stress on survival and reproductive performance of seabirds

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Abstract

Traditional field methods of assessing effects of fluctuations in food supply on the survival and reproductive performance of seabirds may give equivocal results. In this project we applied an additional tool: The measure of stress hormones in free-ranging seabirds. Food stress can be quantified by measuring base levels of stress hormones such as corticosterone in the blood of seabirds, or the rise in blood levels of corticosterone in response to a standardized stressor: capture, handling and restraint. We applied these techniques to seabirds breeding in Lower Cook Inlet and also used captive birds for controlled experiments. This study provided a unique opportunity for a concurrent field and captive study of the behavioral and physiological consequences of stress in seabirds. Moreover, this study provides the basis for management of seabird populations in the areas affected by the Exxon Valdez oil spill, which will have broader applications for seabird monitoring programs. This year represents production of a synthesis of the project.

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Publication type Report
Publication Subtype Other Report
Title Effects of food stress on survival and reproductive performance of seabirds
Year Published 2001
Language English
Publisher Exxon Valdez Oil Spill Trustee Council
Publisher location Anchorage, AK
Contributing office(s) Alaska Science Center
Description 9 p.
Public Comments Final Report: Exxon Valdez Oil Spill Restoration Project 02479
Country United States
State Alaska
Other Geospatial Cook Inlet, Gulf of Alaska
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