Long term changes of population genetic structure of the Japanese eel Anguilla japonica
Date Issued
2012
Date
2012
Author(s)
Hsieh, Ming-Hui
Abstract
Population genetic analysis is commonly used to examine, manage, and conserve widespread species. The Japanese Eel (Anguilla japonica) is widely distributed in East Asia and its population size has dramatically declined since the 1970s. Recent studies using microsatellite loci indicate that panmixia was observed in A. japonica. There is no significant differentiation in the temporal or spatial scale of A. japonica, yet the historical demographics are not k now, such as whether the species suffered genetic bottlenecks, genetic drift, and/or inbreeding depression. We used 7 polymorphic microsatellite DNA loci from 13 geographic locations in East Asia, spanning from 22°N to 40°N, from 1985 to 2012 to understand the genetic diversity of A. japonica. Our data show that A. japonica still exhibits high genetic diversity in terms of average allelic richness (14.78) and observed heterozygosity (0.68–0.85). Inbreeding is rare (FIS= 0.066), and there is no genetic differentiation among annual cohorts (FST= 0.0069). The estimated mean effective population size (Ne) among the 26 years is modest (24.7 to infinity). In conclusion, there is no significant differentiation among annual groups of A. japonica. Simulation studies suggest that the population genetics of A. japonica has been stable for the past two decades, but might experience bottleneck in the past. No evidence of genetic bottleneck is found in the 26 annual cohorts. Accordingly, these data suggest that the population of A. japonica, under the current situation, does not face severe threat of losing genetic diversity.
Subjects
Japanese Eel
microsatellite DNA
population genetics
genetic bottleneck effect
genetic drift
inbreed
Type
thesis
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