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Quantifying the Elevation of Mitochondrial DNA Evolutionary Substitution Rates Over Nuclear Rates in the Intertidal Copepod Tigriopus californicus

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Abstract

Mitochondrial DNA (mtDNA) genomes generally evolve rapidly in animals, but considerable variation in the rates of evolution of mtDNA occurs among taxa. Higher levels of mutation will tend to increase the amount of polymorphism, which should also scale with population size, but there are mixed signals from previous studies on the evolutionary outcomes of the interactions of these processes. The copepod Tigriopus californicus provides an interesting model in which to study the evolution of mtDNA because it has high levels of divergence among populations and there is the suggestion that this divergence could be involved in reproductive isolation. This species also appears to have an elevated mtDNA substitution rate, but previous studies did not provide an accurate measurement. This article examines the rate of mtDNA substitution versus nuclear substitution in T. californicus and finds that the mtDNA rate for synonymous sites averages 55-fold higher, a level that exceeds the rates found in most other invertebrates. Levels of polymorphism are also examined in both mtDNA and nuclear genes, and it is shown that the effective population size of mtDNA genes is much lower than that of nuclear genes. In addition, no correlation between polymorphism in mtDNA and nuclear genes is found across populations, which suggest factors other than demography may shape polymorphism in this species. The results from this study suggest that mtDNA is evolving at a very rapid rate in this copepod species, and this could increase the likelihood that mtDNA evolution is involved in the generation of reproductive isolation.

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Acknowledgments

The author would like to thank N. Gindele, A. Craven, and E. Burch for their assistance with data collection and analysis; and T. Lima and three reviewers for their useful comments on this article. The study was supported by the National Science Foundation Grant DEB-0821003.

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  1. Department of Biology, University of North Carolina, CB#3280 Coker Hall, Chapel Hill, NC, 27599-3280, USA

    Christopher S. Willett

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Willett, C.S. Quantifying the Elevation of Mitochondrial DNA Evolutionary Substitution Rates Over Nuclear Rates in the Intertidal Copepod Tigriopus californicus . J Mol Evol 74, 310–318 (2012). https://doi.org/10.1007/s00239-012-9508-1

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  • DOI: https://doi.org/10.1007/s00239-012-9508-1

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