Status of the California Red-legged Frog (Rana draytonii) in the State of Baja California, México

Herpetological Conservation and Biology
By: , and 

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Abstract

The California Red-legged Frog (Rana draytonii) 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 R. draytonii 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 Mártir. We found R. draytonii 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 Mártir (two sites at Arroyo San Rafael, two sites at Arroyo San Telmo, and six sites at Arroyo Santo Domingo). We did not detect R. draytonii 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.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Status of the California Red-legged Frog (Rana draytonii) in the State of Baja California, México
Series title Herpetological Conservation and Biology
Volume 11
Issue 1
Year Published 2016
Language English
Publisher Partners in Amphibian and Reptile Conservation
Publisher location Texarkana, TX
Contributing office(s) Western Ecological Research Center
Description 13 p.
First page 168
Last page 180
Country Mexico
State Baja California
Online Only (Y/N) N
Additional Online Files (Y/N) N