Spatial and temporal analysis of population genetic structure of the Japanese eel in Taiwan and Japan
Date Issued
2008
Date
2008
Author(s)
Liao, Yi-Fen
Abstract
We use 6 polymorphic microsatellite loci and otolith increments to analyze population genetic structure and leptocephalus stages duration of Japanese eel from Taiwan and Japan between 2001 to 2002. We collected Japanese glass eel from Taiwan between 2007 to 2008 for growth experiment. In this study, we aim to clarify how the eel populations are distributed. Results showed very low genetic differentiation among recruits with insignificant differences (overall FST = 0.00015, p = 0.60). In multidimensional scaling (MDS) analysis, there are no specific spatial or temporal correlations between recruits, indicating no significant genetic differentiation in spatial and temporal scale. The mean larval durations of Japanese eel in Taiwan were significantly shorter than those in Japan (101.4 ± 9.0 d). The larval durations between early recruits (89.3 ± 8.3 d) and late recruits (92.4 ± 10.8 d) of Taiwan showed no significant difference (p = 0.36). There was also no significant genetic differentiation between samples with short or long larval durations (overall FST = 0.0026, P = 0.11), suggesting no correlation between larval duration and population genetic structure of Japanese eel. The mean total length and weight of early recruits, after 60 days culture, had no significant difference between groups reared at 25℃ and 31℃. The mean total length of late recruits reared under 31℃ is significantly longer than those reared under 25℃, but the mean weight under the two temperatures had no significant difference. Our results support the panmictic population of the Japanese eel. There may be no north and south populations between eels from Taiwan and Japan. The variation on length of leptocephalus stage is likely an acclimation, which depends on the environmental conditions, but not caused by heritability.
Subjects
Japanese eel
microsatellite DNA
population genetic structure
otolith increments
leptocephalus stage
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