Genetic diversity and population structure of three dominant myctophid fishes (<Emphasis Type="Italic">Diaphus theta,Stenobrachius leucopsarus</Emphasis>, and <Emphasis Type="Italic">S. nannochir</Emphasis>) in the North Pacific Ocean |
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| Authors: | Shigeaki Kojima Masatoshi Moku Kouichi Kawaguchi |
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| Institution: | (1) Ocean Research Institute, The University of Tokyo, Minamidai, Nakano-ku, Tokyo 164-8639, Japan;(2) Department of Fishery Science and Technology, National Fisheries University, Nagata-Honmachi, Shimonoseki, Yamaguchi 759-6595, Japan |
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| Abstract: | We compared the genetic diversity of three dominant myctophid fishes in the North Pacific Ocean that have different diel vertical
migration patterns on the basis of the nucleotide sequences of the mitochondrial gene for cytochrome b. No genetic structure was detected for each of these three species. The genetic diversity progressively increased for Diaphus theta, a diel migrant species showing clear diel vertical migration; Stenobrachius leucopsarus, a semi-diel migrant, in which only part of the population migrates vertically; S. nannochir, a non-diel migrant. All three species were suggested to have experienced a recent, sudden population expansion. Interspecific
differences in genetic diversity might be attributable to differences in the degree of population size reduction during the
glacial periods; this degree in turn corresponds to the energy demand of the fishes. |
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| Keywords: | Myctophid fishes mitochondrial DNA cytochrome b North Pacific Ocean genetic diversity population structure diel vertical migration |
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