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• W2898897161 abstract "Endangered species that exist in small isolated populations are at elevated risk of losing adaptive variation due to genetic drift. Analyses that estimate short-term effective population sizes, characterize historical demographic processes, and project the trajectory of genetic variation into the future are useful for predicting how levels of genetic diversity may change. Here, we use data from two independent types of genetic markers (single nucleotide polymorphisms [SNPs] and microsatellites) to evaluate genetic diversity in 17 populations spanning the geographic range of the endangered eastern massasauga rattlesnake (Sistrurus catenatus). First, we use SNP data to confirm previous reports that these populations exhibit high levels of genetic structure (overall Fst = 0.25). Second, we show that most populations have contemporary Ne estimates <50. Heterozygosity-fitness correlations in these populations provided no evidence for a genetic cost to living in small populations, though these tests may lack power. Third, model-based demographic analyses of individual populations indicate that all have experienced declines, with the onset of many of these declines occurring over timescales consistent with anthropogenic impacts (<200 years). Finally, forward simulations of the expected loss of variation in relatively large (Ne = 50) and small (Ne = 10) populations indicate they will lose a substantial amount of their current standing neutral variation (63% and 99%, respectively) over the next 100 years. Our results argue that drift has a significant and increasing impact on levels of genetic variation in isolated populations of this snake, and efforts to assess and mitigate associated impacts on adaptive variation should be components of the management of this endangered reptile." @default.
• W2898897161 created "2018-11-09" @default.
• W2898897161 creator A5010747799 @default.
• W2898897161 creator A5064206160 @default.
• W2898897161 creator A5075486537 @default.
• W2898897161 creator A5081289191 @default.
• W2898897161 date "2019-01-28" @default.
• W2898897161 modified "2023-10-16" @default.
• W2898897161 title "Genetic signatures of small effective population sizes and demographic declines in an endangered rattlesnake,<i>Sistrurus catenatus</i>" @default.
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• W2898897161 doi "https://doi.org/10.1111/eva.12731" @default.
• W2898897161 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6439488" @default.
• W2898897161 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30976301" @default.
• W2898897161 hasPublicationYear "2019" @default.
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