Type: report
Article abstract: Surveys for the endangered Least Bell's Vireo (Vireo bellii pusillus) were conducted at Marine Corps Base Camp Pendleton (MCBCP or Base), California, between 29 March and 12 July 2010. Drainages containing riparian habitat suitable for vireos were surveyed two to seven times. One thousand and sixty-eight territorial male vireos and 60 transient vireos were detected on 19 out of the 23 drainages/sites surveyed. Ninety-seven percent of all vireo territories occurred on the ten most populated drainages, with the Santa Margarita River containing 62% of all territories on Base. Seventy-one percent of male vireos were confirmed as paired.
Number of pages: 113
Authors: Lynn, Suellen; Kus, Barbara;
Year: 2010
Purpose: The purpose of this study was to document the status of Least Bell's Vireo at Marine Corps Base Camp Pendleton in San Diego County, California. Specifically, our goals were to (1) determine the size and composition of the Least Bell's Vireo population at the Base, (2) characterize habitat used by vireos, (3) band a subset of vireos to facilitate the estimation of vireo survivorship and movement, and (4) assess the short-term effects of giant reed removal on vireo fecundity, nest success, and productivity by intensively monitoring vireos within established nest monitoring sites that had recently undergone giant reed removal (2008) and at reference sites in which giant reed had been removed 10-12 years earlier, between 1997 and 1999.
Prepared for: Assistant Chief of Staff, Environmental Security U.S. Marine Corps Base Camp Pendleton;
Prepared by: U.S. Geological Survey, Western Ecological Research Center;
Keywords: endangered species; least Bell's Vireo; Marine Corps Base Camp Pendleton;
Species: Least Bell's vireo
Vegetation communities: riparian forest & scrub
Threats: Parasitism/disease