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2010 Banding and Nest Monitoring Report

Banding Students and community members monitored twenty-two peregrine falcon nest sites in the San Francisco Bay Area during the 2010 nesting season. It is important to note that “monitoring” means that observers remain far enough away from the nest so that adult peregrines are not disturbed. Information about a nest site is gathered by viewing and interpreting behavioral cues that are described in detail at our web site,  scpbrg.org, in the “volunteers” section.

Repeated visits by qualified observers are required to accurately report occupancy and productivity at a peregrine falcon nest site. We are grateful to the UC Santa Cruz students and members of the community who gave their time and effort to assist with this ongoing effort. Here is what we learned.

Twenty-two sites were monitored in 2010. At least one adult peregrine falcon occupied nineteen of the sites. Breeding activity occurred (eggs were laid) at fourteen sites. Four sites failed to produce young. Ten sites are known to have produced young and we were able to count a total of twenty-two young at seven of the sites. We climbed to five nests and banded fourteen nestlings that were each about three weeks old.

Reproductive success may be estimated for the Bay Area population by combining the information that we have for sites where the outcome of nesting is known (fourteen nests where breeding activity was attempted producing at least twenty-two young). Based on this sample, we conclude that an average 1.57 young per nest were produced in the 2010 San Francisco Bay Area population.