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Long-term persistence and evolutionary divergence of a marine fish population with a very small effective population size (Kildin cod Gadus morhua kildinensis)

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Abstract

The effective population size (Ne) is a crucial characteristic of numerically small populations, positively correlated with their ability to persist in a changing environment and to evolve. Information about the lower bounds of Ne of natural populations is both theoretically interesting and practically important. We studied Kildin cod, an isolated population of Atlantic cod Gadus morhua from an ecologically marginal habitat (marine lake), comparing it with the parental Barents Sea population by a set of 20 microsatellite and protein loci. Overall, the genetic variability in Kildin cod was low (mean allelic richness and heterozygosity: Kildin cod 1.6, 0.26; marine cod 11.6, 0.73). We detected a single locus, the glucose-6-phosphate isomerase-1, which demonstrated a unique variation in the lake. At this locus, about 75 % of the lacustrine fishes carried an allele not found in the sea. The obtained genetic estimates of Ne of Kildin cod (less than a hundred) were much smaller than what is considered as the smallest Ne of a viable population. At the same time, Kildin cod is known to be healthy and productive. Based on the results of bottleneck tests, we hypothesize that Kildin cod has experienced founder-flush dynamics that lead to loss of genetic variation during the founder phase(s) and purging of genetic load and the rise of adaptation during flush phase(s).

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Acknowledgments

We extend our sincere gratitude to the following persons and organizations: E. Movchan and other members of the Saint-Petersburg State University (SPbSU) Barents Sea expeditions for their assistance in the field; N. Lentsman for English language editing of the manuscript; T. Moum, P.R. England, D. Roy and anonymous reviewers for helpful comments; Centre for molecular and cell technologies of SPbSU for technical help. This work was funded by SPbSU (Grant no. 1.38.253.2014) and Russian Foundation for Basic Research (Grant nos. 07-04-01734-a and 10-04-90836).

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  1. St. Petersburg State University, Vasil’evsky Isl., 16 line 29, St. Petersburg, 199178, Russia

    Victor Andreev & Petr Strelkov

  2. Research Institute of Lake and River Fisheries, Makarova nab. 26, St. Petersburg, 199053, Russia

    Victor Andreev

  3. Zoological Institute, Russian Academy of Science, Universitetskaya nab. 1, St. Petersburg, 199034, Russia

    Mikhail Fokin

  4. Russian Federal Research Institute of Fisheries and Oceanography, Verhnyaya Krasnoselskaya st. 17, Moscow, 107140, Russia

    Nikolai Mugue

  5. N.K. Koltzov Institute of Developmental Biology, Russian Academy of Science, Vavilov st. 26, Moscow, 117808, Russia

    Nikolai Mugue

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Andreev, V., Fokin, M., Mugue, N. et al. Long-term persistence and evolutionary divergence of a marine fish population with a very small effective population size (Kildin cod Gadus morhua kildinensis). Mar Biol 162, 979–992 (2015). https://doi.org/10.1007/s00227-015-2642-8

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