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Double-crested Cormorants have been breeding on the Richmond-San Rafael Bridge and the San Francisco-Oakland Bay Bridge since the 1980's. These man-made structures have hosted the largest colonies of this species in the Bay for several years. However, new bridge construction, bridge maintenance activities, and recent declines in forage fish populations have led to drastic declines in both of the colonies.
Contact: Meredith Elliott
Jaime Jahncke
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PROJECT GOALS
Since 1988, PRBO has collaborated with other organizations and agencies to study this species in order to:
- Investigate breeding phenology, abundance, distribution, and breeding success
- Understand recent declines of Double-crested Cormorants at these bridges as well as their regional population trends
- Aid the California Department of Transportation to conduct construction and maintenance activities with minimal effects to birds
FOCAL SPECIES
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Double-crested Cormorant
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Northern Anchovy
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RESULTS
Double-crested Cormorant declines in San Francisco Bay
Double-crested Cormorant metapopulation
PARTNERS
California Department of Fish and Game
Garcia and Associates
LSA and Associates
National Oceanic and Atmospheric Administration
San Francisco bay Bird Observatory
U.S. Fish and Wildlife Service
