Supplementary material from "Genetic rescue in an inbred Arctic fox (Vulpes lagopus) population"
Posted on 2018-03-10 - 12:14
Isolation of small populations can reduce fitness through inbreeding depression and impede population growth. Outcrossing with only a few unrelated individuals can increase demographic and genetic viability substantially, but few studies have documented such genetic rescue in natural mammal populations. We investigate the effects of immigration in a subpopulation of the endangered Scandinavian arctic fox (Vulpes lagopus), founded by six individuals and isolated for 9 years at an extremely small population size. Based on a long-term pedigree (105 litters, 543 individuals) combined with individual fitness traits, we found evidence for genetic rescue. Natural immigration and gene flow of three outbred males in 2010 resulted in a reduction in population average inbreeding coefficient (f), from 0.14 to 0.08 within 5 years. Genetic rescue was further supported by 1.9 times higher juvenile survival and 1.3 times higher breeding success in immigrant first-generation offspring compared with inbred offspring. Five years after immigration, the population had almost doubled in size and allelic richness increased by 37%. This is one of few studies that has documented genetic rescue in a natural mammal population suffering from inbreeding depression and contributes to a growing body of data demonstrating the vital connection between genetics and individual fitness.
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Hasselgren, Malin; Angerbjörn, Anders; Eide, Nina E.; Erlandsson, Rasmus; Flagstad, Øystein; Landa, Arild; et al. (2018). Supplementary material from "Genetic rescue in an inbred Arctic fox (Vulpes lagopus) population". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.4028188.v1