key to understanding seabird population dynamics is to characterize the biological responses of seabirds to fluctuations in prey abundance, distribution and quality. This long-term study forms the basis of the Alaska Science Center - Biological Science Office Seabird Project, and is designed to measure foraging (functional) and population (numerical) responses of six seabird species to fluctuating forage fish densities at three seabird colonies in lower Cook Inlet. This involves at-sea surveys (hydroacoustic, trawling, seining) for forage fish while measuring aspects of seabird breeding biology and behavior at adjacent colonies. Funded by the Exxon Valdez Oil Spill (EVOS) Trustees under the Apex Predator Experiment (APEX) program, and by USGS (including Base and MMS-OCS funds). Collaboration with Alaska Maritime National Wildlife Refuge (ANMWR), U.S. Fish & Wildlife Service (USFWS), Alaska Department of Fish and Game (ADF&G), Institute of Marine Science, University of Alaska Fairbanks (IMS-UAF) and several universities. Last year of field work was FY99. Reduced funding for write-up in FY00-01.