Protocol for the reintroduction of California red-legged frogs to Santa Monica Mountains National Recreation Area
Semple Delaney K, Mendelsohn M, Wenner SM, Backlin A, Gallegos E, Fisher RN, Riley SP. 2023. Protocol for the reintroduction of California red-legged frogs to Santa Monica Mountains National Recreation Area. Natural Resource Report. NPS/SAMO/NRR—2023/2507. National Park Service. Fort Collins, Colorado. https://doi.org/10.36967/2297287
Once common and widespread in Southern California, California red-legged frogs (Rana draytonii) began declining sometime in the middle of the 20th century. They were listed as threatened under the Endangered Species Act in 1996. Three small and isolated populations remained in Los Angeles and Ventura Counties by the start of the 21st century. The nearest population of California red-legged frogs to Santa Monica Mountains National Recreation Area is critically small, located 15 km to the north, yet there is evidence of persistence, including successful reproduction each year it has been measured. A potential solution to alleviate small population size and isolation is to reintroduce a species back to habitable historical locations nearby. In 2011, we initiated a project to reintroduce California red-legged frogs back to the Santa Monica Mountains, where historical records showed they were once widespread. We developed a procedure to transfer partial egg masses into tadpole rearing pens located within streams determined to be suitable for the species. This translocation protocol outlines our procedure and results for the first five years of the project. It is our hope that this protocol will guide and inform similar conservation efforts for California red-legged frogs in other parts of their range as well as other amphibian conservation efforts throughout the world.
- Type
- Published Report
- Authors
- Semple Delaney, Kathleen; Mendelsohn, Mark; Wenner, Sarah; Backlin, Adam; Gallegos, Elizabeth; Fisher, Robert; Riley, Seth
- Date of Issue
- 2023-04
- Publisher
- National Park Service
- DOI
- 10.36967/2297287
- Units
- NRSS , SAMO
- Keywords
- California Red-legged Frogs, endangered species, southern California
- Subjects
- Ecological Framework: Biological Integrity | Focal Species or Communities | Amphibians and Reptiles