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These maps show the biomass of marine birds during three oceanic seasons (March 15 - August 14, August 15 - November 14, and November 15 - March 14). These data were provided by the California Biogeographic Assessment prepared for the Monterey Bay National Marine Sanctuary's Management Plan.

Citation: NOAA National Centers for Coastal Ocean Science (NCCOS) 2003. A Biogeographic Assessment off North/Central California: To Support the Joint Management Plan Review for Cordell Bank, Gulf of the Farallones, and Monterey Bay National Marine Sanctuaries: Phase I - Marine Fishes, Birds and Mammals. Prepared by NCCOS's Biogeography Team in cooperation with the National Marine Sanctuary Program. Silver Spring, MD 145 pp.
 
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