The history of effective population size and genetic diversity in the Yellowstone grizzly (Ursus arctos): Implications for conservation

AUTOR(ES)

Miller, Craig R.

FONTE

The National Academy of Sciences

RESUMO

Protein, mtDNA, and nuclear microsatellite DNA analyses have demonstrated that the Yellowstone grizzly bear has low levels of genetic variability compared with other Ursus arctos populations. Researchers have attributed this difference to inbreeding during a century of anthropogenic isolation and population size reduction. We test this hypothesis and assess the seriousness of genetic threats by generating microsatellite data for 110 museum specimens collected between 1912 and 1981. A loss of variability is detected, but it is much less severe than hypothesized. Variance in allele frequencies over time is used to estimate an effective population size of ≈80 across the 20th century and >100 currently. The viability of the population is unlikely to be substantially reduced by genetic factors in the next several generations. However, gene flow from outside populations will be beneficial in avoiding inbreeding and the erosion of genetic diversity in the future.

Documentos Relacionados

• Contribution à l'Étude du Développement du Cerveau de l'Ours brun (Ursus Arctos L.)
• Genetic Drift and Estimation of Effective Population Size
• Effective population size and genetic gain expected in a population of Coffea canephora
• Intraspecific variation in population gene diversity and effective population size correlates with the mating system in plants.
• Note on Genetic Drift and Estimation of Effective Population Size