Bradford D. Hellingsworth Jonathan Q. Richmond Jorge H. Valdez-Villavicencio Gorgonio Ruiz-Campos Robert N. Fisher Pedro Cruz-Hernandez Patricia Galina-Tessaro Anny Peralta-Garcia 2016 <p>The California Red-legged Frog (<i>Rana draytonii</i>) is a threatened species in the United States that has undergone population declines, especially in southern California. Due to the lack of information on the status of Mexican populations, we surveyed for the presence of <i>R. draytonii</i> in Baja California and assessed possible threats to population persistence. Our study area extended from the U.S.-Mexican border to the southern end of the distribution of the species in the Sierra San Pedro M&aacute;rtir. We found <i>R. draytonii</i> at six of 15 historical sites, none at five proxy sites (i.e., alternative sites chosen because the historical record lacked precise locality data), and four at 24 additional sites. The 10 occupied sites are within three watersheds in the Sierra San Pedro M&aacute;rtir (two sites at Arroyo San Rafael, two sites at Arroyo San Telmo, and six sites at Arroyo Santo Domingo). We did not detect <i>R. draytonii</i> at 60% of historical sites, including the highest elevation site at La Encantada and multiple low-elevation coastal drainages, suggesting the species has declined in Baja California. The threats we noted most frequently were presence of exotic aquatic animal species, water diversion, and cattle grazing. Management of remaining populations and local education is needed to prevent further declines.</p> application/pdf en Partners in Amphibian and Reptile Conservation Status of the California Red-legged Frog (Rana draytonii) in the State of Baja California, México article