PRBOPoint Reyes Bird Observatory
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PRBO Conservation Science, 3820 Cypress Drive #11, Petaluma, California 94954, USA; present address: Audubon Alaska, 441 West Fifth Avenue, Suite 300, Anchorage, Alaska 99501, USA; nwarnock@audubon.
Using data collected at thousands of locations across California, the PRBO scientists project current and future statewide distributions for 64 bird species using climate models developed at UC Santa Cruz.
Counts conducted by PRBO since the 1970s targeted only the South Farallon Islands, whereas CDFG counts included the South and North Farallon Islands.
Families were removed in 1965 and the lighthouse was automated in 1972, after which time only PRBO researchers remained on the island (Ainley and Lewis, 1974).
PRBO found pronounced age effects during years of poor fish availability, with significantly smaller C eggs and low fledging success for young (inexperienced) parents (Sydeman et al.
The PRBO studies also report a major difference in breeding performance between first-time and experienced breeders (Pyle et al.
This difference probably results from the fact that PRBO restricted their data set to 3-9 yr-old birds with 0-4 yr of breeding experience "because of inadequate samples of older, more experienced gulls" (Pyle et al.
Although scientists at the PRBO are the undisputed Western Snowy Plover experts, the CCC has continually focused on the vehicles in the park over predator management.
Rhinoceros Auklets are believed to be monogamous (Richardson 1961; Leschner 1976; PRBO unpublished data), and they generally breed in the same crevice or burrow, year after year.
1990)), loss of nesting habitat to erosion and trampling by pinnipeds, and human disturbance (Lewis and Tyler 1987, PRBO unpublished data).