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Fine scale genetic population structure of the freshwater and Omono types of nine‐spined stickleback Pungitius pungitius (L.) within the Omono River system, Japan
Author(s) -
Tsuruta T.,
Goto A.
Publication year - 2006
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2006.01154.x
Subject(s) - biology , stickleback , analysis of molecular variance , population , mantel test , genetic structure , ecology , genetic divergence , population genetics , genetic diversity , zoology , genetic variation , evolutionary biology , genetics , fishery , demography , fish <actinopterygii> , sociology , gene
The fine scale geographic population structure of two types of nine‐spined stickleback Pungitius pungitius (the widely distributed freshwater type and a local endemic, the Omono type) within the Omono River system, Japan, was investigated. A principal components analysis of allele frequencies and neighbour‐joining tree for pair‐wise F ST values, based on 10 allozyme loci, revealed that the Omono type was comprised of four regional groups with relatively high genetic divergence. This grouping was also supported by hierarchical analysis of molecular variance (AMOVA) with a higher variance component among the regional groups, and by an exact test with significant genotypic differentiation for all sample pairs among the regional groups. Moreover, in the clustering of individuals using the Bayesian method, most of individuals in each regional group were assigned the corresponding cluster. On the other hand, there were less pronounced regional groups of the freshwater type, although AMOVA, exact test for genotypic differentiation and Bayesian analysis indicated genetic divergence between two sampling sites in lower reach of the Omono River and other sites. The results suggest that the Omono type represented an earlier colonization, with subsequent invasion of the freshwater type.