Distribution and Breeding Status of Least Bell’s Vireo along the San Luis Rey River in San Diego County, California for Select Years (1996, 1999-2001, 2003-2004 and 2007)

The spatial data are results of USGS surveys for Least Bell's Vireo (Vireo bellii pusillus) (LBVI) along the San Luis Rey River for selected years (1996, 1999-2001, 2003-2004, 2007). Data was used to determine abundance and distribution of vireos as part of long-term demographic studies.