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Abstract
The genetic diversity of the endangered species Oncorhychus
masou formosanus,has attracted increasing attention. This study
applied isozyme electrophoresis and mitochondria DNA sequencing
to analyze the genetic diversity within and among populations
in Taiwan and Japan.
As the isozyme experiment results indicated, only one out of
twenty three loci expressed minor genetic variations. It
implies low genetic diversity(Ho=0), and the F-statistic
analysis demonstrated the populations in Taiwan tended to
inbreed.
The DNA sequencing data lead to three main conclusions: One, the
genetic distances between anadramous and landlocked
populations in Japan is far greaterthan the distances within
population, which indicated that anadramous and landlocked
populations are gradually diverging. Two, landlocked populations
in Taiwan and Japan differ genetically slightly. This situation
is common among Pacific salmon genera. However, the
diversity of the Japan population (four genotypes in seven
specimen) is greater than that Taiwan''s (two genotypes
in twelve specimen). Three, the Taiwan population exhibits low
genetic diversity. The base pair difference between the two
genotypes dedicates a genetic distance of 0.0001. As a
result, one of the essential efforts to preserve this
precious species lies on maintaining and increasing the
genetic diversity of the population.
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