Rocky Intertidal Monitoring

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Park staff take measurements on a rocky surface with the city in the background
Rocky intertidal monitoring on Alcatraz Island

NPS / Sarah Wakamiya

The rocky intertidal zone, or the band of rocky shore covered up by the highest of tides and exposed by the lowest of tides, is an extraordinarily diverse and productive ecosystem. More than 1,000 species of invertebrates and algae live in Central California's rocky intertidal areas, and many more fish, birds and mammals rely on rocky intertidal species as a source of food. While rocky intertidal communities can withstand pounding surf and scorching sun, they are also highly sensitive to pollution, oil spills, invasive species and changing air and ocean temperatures.

The San Francisco Bay Area Inventory and Monitoring Program monitors rocky intertidal communities at five sites in Golden Gate National Recreation Area and Point Reyes National Seashore. Though rocky intertidal monitoring has taken place at some sites since 1989, a new monitoring protocol developed for the Multi-Agency Rocky Intertidal Network (MARINe) was adopted in 2006 to allow results to be directly compared to more than 100 other MARINe sites.

Monitoring Documents

Protocol Documents

Source: Data Store Saved Search 1910. To search for additional information, visit the Data Store.

Monitoring/Trend Reports

Source: Data Store Saved Search 1911. To search for additional information, visit the Data Store.

Resource Briefs

Source: Data Store Saved Search 1838. To search for additional information, visit the Data Store.

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