期刊
ANIMAL CONSERVATION
卷 24, 期 5, 页码 847-861出版社
WILEY
DOI: 10.1111/acv.12688
关键词
forward simulation; genetic diversity; genetic drift; inbreeding; N; (e); N; (b); observed heterozygosity; population size estimation
资金
- Australian Marine Mammal Centre
- Sea World Research and Rescue Foundation
- Department of the Environment, Water, Heritage and the Arts
- Macquarie University
- Resources Aquatiques Quebec (RAQ)
- Canadian Research in Genomics and Conservation of Aquatic Resources
- Department for Environment, Water and Natural Resources, SA [Z25675]
- DEH SA Wildlife Ethics Committee [44/2008]
This study found that the endangered Australian sea lion has experienced genetic bottlenecks, leading to reduced effective population sizes and loss of genetic variation. Future population declines may exacerbate inbreeding risk, making the species more vulnerable.
Genetic bottlenecks can reduce effective population sizes (N-e), increase the rate at which genetic variation is lost via drift, increase the frequency of deleterious mutations and thereby accentuate inbreeding risk and lower evolutionary potential. Here, we tested for the presence of a genetic bottleneck in the endangered Australian sea lion (Neophoca cinerea), estimated N-e and predicted future losses of genetic variation under a range of scenarios. We used 2238 genome-wide neutral single-nucleotide polymorphisms (SNPs) from 72 individuals sampled from colonies off the southern (SA) and western (WA) coastline of Australia. Coalescent analyses using approximate Bayesian computation (ABC) methods indicated that both the SA and WA populations have experienced a historical genetic bottleneck. Using LD-based methods, we estimated contemporary N-e to be 160 (CI = 146-178) and 424 (CI = 397-458) for the WA and SA populations respectively. Modelled future population declines suggested that disease epidemics prompted the highest increases in inbreeding relative to fishery-related mortalities and other modelled threats. Small effective sizes and relatively low genetic variation leave this species vulnerable, and these risks may be compounded if current population declines are not reversed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据