| Summary: | 碩士 === 國立臺灣師範大學 === 生物學系 === 84 === Abstract
Genetic structure of Varicorhinus barbatulus（Pellegrin）was
examinedby using isozyme techniques. Among 18 studied
populations, it was foundthat genetic differentiation was high（
FST＝0.511）. Data of genetic distance analysis showing that
there are positive correlations between genetic and geographic
groups, ie Northern Taiwan, Southern Taiwan and Liwu
river, respectively. Gene flow among groups seems to be low（Nm
＝0.239）Overall survery, genetic variability of this species is
still high（He＝0.018? These results indicated that high
genetic diversity（GST＝0.503）of V. barbatulus is suggested to
be due to random mating（Fis＝-0.026）and low gene flow and/or
local selection due to the isolated river system in Taiwan.
Howerer, inbreeding coefficient in overall population（FIT
＝0.498）was unusually high may indicated that Wahlund effect to
be existedin V. barbatulus populations.
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