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Remarkably low mtDNA control-region diversity and shallow population structure in Pacific cod Gadus macrocephalus

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Author to whom correspondence should be addressed at present address: 5 Yushan Road, Qingdao, Shandong 266003, China. Tel.: +86 532 82032063; fax: +86 532 82032076; email: gaozhang@ouc.edu.cn

Abstract

To investigate the genetic diversity and describe the population structure in Gadus macrocephalus, a 452 base pair (bp) fragment of the mitochondrial DNA control region was analysed in 259 individuals. The results showed remarkably low nucleotide diversity and a lack of genealogical structure. Small but significant genetic differentiations, however, were detected among north-western Pacific populations, but no large-scale regional differences were detected. These results indicate that populations of G. macrocephalus in the north-western Pacific are genetically subdivided and represent evolutionary lineages that should be managed individually.

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