Elucidating evolutionary processes in three threatened carnivores: genetic substructure, admixture, and cancer susceptibility

• Main Author: Hendricks, Sarah
• Other Authors: Hohenlohe, Paul
• Format: Text
• Language: English
• Published: 2019
• Subjects: Conservation biology; Evolution & development; Genetics; Canis lupus; Mite
• Online Access: http://digital.lib.uidaho.edu/cdm/ref/collection/etd/id/2030

Advanced genomic techniques can be used to understand threats to global biodiversity and to promote ecosystem conservation. Population structure, migration, admixture, and the genetic basis of adaptive variation can be inferred in small, isolated, and declining populations of interest, thereby adding knowledge necessary for appropriate conservation planning. Here, I present three case examples to illustrate genomics’ potential to influence the management of wild populations. First, Tasmanian devils (Sarcophilus harrisii) face a combination of threats to persistence, including devil facial tumor disease (DFTD), an epidemic transmissible cancer. I used RAD sequencing to investigate genome-wide patterns of genetic diversity and geographic population structure. Our results refine the geographic extent of the zone of mixed ancestry and substructure within it. DFTD has spread across all genetic clusters, but recent evidence points to a genomic response to selection imposed by DFTD. Any allelic variation for resistance to DFTD may be able to spread across the devil population, and/or be present as standing variation in both genetic regions. This can inform the management of genetic variation that existed in pre-diseased populations of the species. Second, wolves (Canis lupus) have naturally reestablished in the Pacific northwest region of North America. I used targeted capture sequencing to acquire SNP data from which I inferred population structure and ancestry. The wolves in Washington state represent an admixed population between the inland Northern Rocky Mountain wolf and the coastal rainforest wolf. Given this admixture, conservation status and management could be impacted if other coastal wolf populations continue to decline in size. Third, Catalina Island (SCA) foxes (Urocyon littoralis catalinae) have a high prevalence of ear canal (ceruminous gland) tumors that appear to be associated with inflammation from chronic ear mite (Otodectes) infections. I tested the hypothesis that the remarkably high incidence of ...