Abstract
Conservation breeding programs have long been an important management tool for species recovery. Recently, breeding programs have begun to integrate next generation sequencing data into pedigree-based management strategies designed to maximize retention of genetic diversity and minimize inbreeding. In 2005, an ex situ breeding program for two of the three extant, geographically separate populations of the endangered southern mountain yellow-legged frog (Rana muscosa) was established at the San Diego Zoo Wildlife Alliance. To provide improved breeding recommendations for the species, we conducted molecular population genetic assessments using double digest restriction site-associated DNA sequencing data. We first studied genetic diversity, population differentiation, and genetic structure of wild frogs to validate the status of management units in R. muscosa. Genetic diversity was relatively low (HO = 0.166–0.245), population differentiation moderate (FST = 0.29), and patterns of genetic structure and admixture supported the evolutionary divergence of frogs by mountain ranges with limited gene flow. In the breeding program, relatedness estimates identified close relatives amongst the founders, and molecularly-derived kinship values were used to determine and rank suitable breeders to minimize population mean kinship. Ex situ management recommendations highlight the need for importing additional founders from the wild to enhance genetic diversity in the breeding program, as an effective source for genetic restoration. Alternatively, the use of advanced reproductive technologies to capture wild diversity without removal of individuals from the wild seem promising.
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Data availability
Supplementary tables with sample and sequence read information are deposited in the Dryad data repository (https://doi.org/10.5061/dryad.5tb2rbpbb and https://doi.org/10.5061/dryad.95x69p8rq). Raw sequence reads are deposited at NCBI (Project number PRJNA1061082). Scripts for selecting Stacks parameter settings are available on GitHub (https://github.com/apwilder/StacksParameterSelection).
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Acknowledgements
We would like to thank our partners in the R. muscosa recovery program including the United States Fish and Wildlife Service, California Department of Fish and Wildlife, United States Forest Service, United States Geological Survey (USGS), the Los Angeles Zoo, Omaha’s Henry Doorly Zoo, University of California, Los Angeles, Aquarium of the Pacific and Santa Ana Zoo. We appreciate the support of Jonathan Richmond and Robert Fisher from USGS, for providing the San Gabriel DNA samples used as reference population in this study. Finally, and most importantly, we acknowledge that our research takes place on the traditional lands of numerous Indigenous Peoples. We would therefore like to respectfully acknowledge the traditional custodians of the land on which this work was conducted and pay our respect to Elders both past, present and emerging.
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This work was supported by the Disney Conservation Fund AZA/AZH (Conservation Grants Funds File Number: 17-1433). Dr. Calatayud received financial aid from Exploradora de Immuebles, S.A. (EISA) as postdoctoral fellow.
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CCS, JI, NEC and DMS contributed to the study conception and design. Material preparation, data collection and analysis were performed by CCS, LJ, EC, AW and JI. The first draft of the manuscript was written by CCS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Steiner, C.C., Jacobs, L., Choi, E. et al. Integrating genomics into the genetic management of the endangered mountain yellow-legged frog. Conserv Genet 25, 647–662 (2024). https://doi.org/10.1007/s10592-023-01594-3
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DOI: https://doi.org/10.1007/s10592-023-01594-3