Chromosomal Variability in Chironomus plumosus (Linnaeus, 1758) (Diptera, Chironomidae) from a Coastal Lagoon of the Baltic Sea (Curonian Lagoon)

Abstract

Chromosomal variability of Chironomus plumosus (Linnaeus, 1758) population from the coastal Curonian Lagoon of the Baltic Sea was studied. The karyotype pool comprises 19 banding sequences (exceeding the mean value of 12.5 ± 0.4 sequences for the Palaearctic populations) and includes some unique sequences that are described here for the first time for the species: p'pluB15, p'pluB16, p'pluC7, p'pluD19, p'pluE3, and p'pluF7. The latter four banding sequences have resulted from pericentric inversions which are rare in Ch. plumosus. Altogether, 21 zygotic and 19 genomic combinations of banding sequences were found. The indices of chromosomal variability, i.e., the proportion of heterozygous individuals (54.43 ± 7.08%) and the number of heterozygous inversions per individual (0.71 ± 0.10), were lower than those in the center of the Palaearctic part of the species’ range; this is typical of peripheral populations. The structure of chromosomal variability has been stable throughout the entire study period (1975, 1998–2009), probably due to favorable living conditions in the Curonian Lagoon.

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ACKNOWLEDGMENTS

The authors are very grateful to the reviewer for thorough consideration of the manuscript and valuable comments, and to N.S. Khabazova for help with manuscript preparation.

Funding

This work was carried out within the framework of State research assignment 0149-2019-0013 at the Institute of Oceanology of the Russian Academy of Sciences and State research assignment AAAA-A19-119020790106-0 at the Zoological Institute of the Russian Academy of Sciences; it was financially supported by the Basic Research Program of the Russian Academy of Sciences “Biodiversity of Natural Systems and the Biological Resources of Russia”: subsection “Gene Pools in Nature and Their Protection.”

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Correspondence to M. F. Markiyanova.

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The authors declare that they have no conflict of interest. All the applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All the procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.

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Markiyanova, M.F., Petrova, N.A. Chromosomal Variability in Chironomus plumosus (Linnaeus, 1758) (Diptera, Chironomidae) from a Coastal Lagoon of the Baltic Sea (Curonian Lagoon). Entmol. Rev. 100, 969–981 (2020). https://doi.org/10.1134/S0013873820070027

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Keywords:

  • Chironomus plumosus
  • chromosomal variability
  • coastal lagoon
  • Curonian Lagoon