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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Kojima, S., Moku, M. & Kawaguchi, K. Genetic diversity and population structure of three dominant myctophid fishes (Diaphus theta, Stenobrachius leucopsarus, and S. nannochir) in the North Pacific Ocean. J Oceanogr 65, 187–193 (2009). https://doi.org/10.1007/s10872-009-0018-8
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DOI: https://doi.org/10.1007/s10872-009-0018-8