Abstract
Genetic divergence in the Far Eastern brook lamprey,Lethenteron reissneri, collected from Hokkaido and Honshu Islands, Japan, was investigated by electrophoretic analysis. Two local groups, northern and southern, were distinguishable by complete allele substitutions at 11 loci, resulting in high genetic differentiation (D=0.558–0.926). In addition, no genetic evidence of hybridization between the two groups was detected in three sympatric river populations, strongly suggesting their reproductive isolation, and separate specific status of the groups. In each local group, the genetic variability within and genetic differentiation between each population was considerable (H=0.034–0.147,Gst=0.508 for the northern group; H=0.024–0.105,Gst=0.629 for the southern group), suggesting large sizes for most populations, along with considerable isolation of each population from the others, resulting in lowered gene flow between them. Based on allele distribution and the cluster pattern on a UPGMA dendrogram, the northern and southern groups could be divided into two and three subgroups, respectively, which may have resulted mainly from isolation due to geographic barriers.
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Yamazaki, Y., Goto, A. Genetic differentiation ofLethenteron reissneri populations, with reference to the existence of discrete taxonomic entities. Ichthyological Research 43, 283–299 (1996). https://doi.org/10.1007/BF02347600
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DOI: https://doi.org/10.1007/BF02347600