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CENTER for BIOLOGICAL DIVERSITY Because life is good
ABOUT ACTION PROGRAMS SPECIES NEWSROOM PUBLICATIONS SUPPORT

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ENDANGERED SPECIES ACT PROFILE

PROTECTION STATUS: Threatened

YEAR PLACED ON LIST: 1987

CRITICAL HABITAT: 18,293 acres in San Mateo and Santa Clara counties designated in 2008

RECOVERY PLAN: 1998

RANGE: San Francisco peninsula, San Mateo County, Santa Clara County

THREATS: Urban development, pesticides, nitrogen deposition, overgrazing, global warming, and air pollution

POPULATION TREND: The Bay checkerspot has been eliminated from most of its serpentine habitat around the San Francisco Bay, and it is extinct in Contra Costa, Alameda, and San Francisco counties. By 1998, there were only five remaining core areas that supported Bay checkerspots and fewer than 12,000 acres of suitable habitat.

Photo © Richard A . Arnold