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Mitogenomic data to study the taxonomy of Antarctic springtail species (Hexapoda: Collembola) and their adaptation to extreme environments

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Abstract

Mitochondrial DNA (mtDNA) encodes for proteins mainly involved in the oxidative phosphorylation process, and due to its molecular features, it is one of the most used molecular markers for phylogenetic and taxonomic purposes. Since mitochondria are the primary source of energy for aerobic organisms, it has been suggested that modifications of the mitochondrial genome’s features could be linked with major adaptive processes to particular environmental conditions. In this respect, Antarctic Collembola (springtails) may be considered an interesting model to study whether positive selective pressure has occurred, inducing significant changes in the mtDNA characteristics that have eventually led to cold adaptation. In this study, we describe the molecular features of the mitochondrial genome of Cryptopygus terranovus, a springtail species endemic to Victoria Land. Molecular data are also employed to support the new taxonomic placement of C. terranovus, and to establish if the conspecific lineages of Friesea antarctica, that lives in separated biogeographical regions of the Antarctic Continent, are indeed distinct species. Finally, all the mitochondrial genomes of springtails, so far sequenced, were applied for calculating the ratio (ω) of nonsynonymous versus synonymous nucleotide substitutions. This approach allowed us to investigate if Antarctic collembolans could have experienced Darwinian selective pressures compared to the non-Antarctic springtail species. Indeed, our data does indicate positive selection (ω > 1), suggesting that survival at extreme environmental conditions could be also related to mtDNA modifications.

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Acknowledgements

This work was funded by: the Italian Program of Research in Antarctica (PNRA16_00234), and the Italian MIUR (PRIN). Partial support was also provided by the University of Siena. All Authors declare no conflict of interest and approved the performed research and the draught of the manuscript. We would like to kindly thank the anonymous Referee, Professor Mark Stevens and Professor Bettine van Vuuren for their important help in improving the present manuscript.

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A.C. collected the material, performed the molecular and bioinformatics analyses and drafted the manuscript; C.L. performed the experiments of the molecular and part of the bioinformatics analyses, and contributed to the drafting of the manuscript. P.P.F. and F.F. contributed to the draught of the manuscript.

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Correspondence to Antonio Carapelli.

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300_2019_2466_MOESM1_ESM.pdf

Table S1. List of complete (or almost complete) springtail mtDNA available on GenBank and their accession numbers. On GenBank, the species Friesea antarctica is still identified as Friesea grisea; the accession numbers provided in the table are referred to specimens previously identified as F. grisea. AP = Antarctic Peninsula; VL = Victoria Land. Supplementary material 1 (PDF 15 kb)

300_2019_2466_MOESM2_ESM.pdf

Table S2: P-distance matrix among the cox1 sequences of the 13 springtails species included in all the analyses of the current study plusCryptopygus cisantarcticus. The divergence matrix was used to estimate the time of divergence among the Isotomidae and the two F. antarctica (AP and VL). Supplementary material 1 (PDF 14 kb)

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Carapelli, A., Fanciulli, P., Frati, F. et al. Mitogenomic data to study the taxonomy of Antarctic springtail species (Hexapoda: Collembola) and their adaptation to extreme environments. Polar Biol 42, 715–732 (2019). https://doi.org/10.1007/s00300-019-02466-8

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  • DOI: https://doi.org/10.1007/s00300-019-02466-8

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