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

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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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Keywords: Gadus macrocephalus; barriers to gene flow; control region; genetic bottleneck; genetic structure; historical demography

Document Type: Regular Paper

Affiliations: 1: Fisheries College, Ocean University of China, Qingdao, Shandong 266003, China 2: Liaoning Marine Fisheries Research Institute, Dalian, Liaoning 116023, China 3: Division of Oceanic Resources, National Institute of Far Seas Fisheries, Yokohama 236-8648, Japan 4: Division of Marine Environment and Resources, Graduate School of Fisheries Science, Hokkaido University, Hakodate, Hokkaido 041-8611, Japan

Publication date: 2010-10-01

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