Cormorant and tern bird egg monitoring was incorporated into the Status and Trends Program in 2008, although substantial monitoring of eggs (cormorant in 2002, 2004, and 2006, and tern in 2002 and 2003) had previously been conducted through Exposure and Effects Pilot Studies. As of 2009, sampling occurs on a triennial basis. Since 2004, cormorant eggs have been collected at the Wheeler Island, Richmond Bridge, and Don Edwards Park sites and analyzed for mercury, selenium, PBDEs, PCBs, and pesticides. PFCs were included in the program in 2009. Tern eggs have primarily been collected from the South Bay and analyzed for mercury. In 2009, the collection effort was expanded to include six locations and analyzed for mercury, selenium, and PBDEs.
These data can be accessed through the Contaminant Data Display and Download (CD3) tool.
Contaminant Concentrations in Eggs of Double-crested Cormorants and Forster's Terns from San Francisco Bay: 2002-2012
San Francisco Bay Triennial Bird Egg Monitoring Program for Contaminants - 2016 Data Summary
San Francisco Bay Triennial Bird Egg Monitoring Program for Contaminants - 2009 Data Summary