Phylogeny and Differentiation of Sibling-Species Sicista of the Group Betulina (Rodentia, Dipodoidea): Results of Analys
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Phylogeny and Differentiation of Sibling-Species Sicista of the Group Betulina (Rodentia, Dipodoidea): Results of Analysis of a Fragment of the IRBP Gene of Nuclear DNA Variability M. I. Baskevicha, *, A. S. Bogdanovb, L. A. Khlyapa, V. M. Malyginc, M. L. Oparina, S. F. Sapelnikovd, and B. I. Sheftela aSevertsov b
Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, 119071 Russia Koltzov Institute of Developmental Biology, Russian Academy of Sciences, Moscow, 119334 Russia c Biological Faculty, Moscow State University, Moscow, 119234 Russia d Voronezh State Reserve, Krasnolesny, Voronezh oblast, 394080 Russia *e-mail: [email protected] Received May 7, 2019; revised July 30, 2019; accepted August 21, 2019
Abstract—Results of the analysis of IRBP (interphotoreceptor retinoid-binding protein) nuclear DNA gene variability in birch mice of the genus Sicista reflect monophyly of the betulina group and confirm the substantial genetic isolation of the sibling species S. betulina and S. strandi within this group. Using Tamura’s 3-parameter model T92, it is shown that the mean genetic distances between S. betulina and S. strandi are 0.7%, comparable to the interspecific genetic distances for sibling species from other groups of birch mice. Their intraspecific differentiation, which is particularly well-expressed in S. strandi, is also identified. Differentiation between the northern and southern populations of S. strandi, comparable to the interspecific differences (D = 0.8%), and isolation of the Carpathian specimen of S. betulina from other European and Siberian sample sets (D = 0.2%) are shown. DOI: 10.1134/S1062359020050027
INTRODUCTION It was previously believed that the polytypic species of the northern birch mouse S. betulina s. lato Pallas, 1779, which is widespread from Scandinavia to Transbaikalia and from the Caucasus to the mouth of the Pechora River (Pucek, 1982), is morphologically homogeneous within its distribution range (Vinogradov, 1937; Ognev, 1948). However, the 1989 revision (Sokolov et al., 1989) increased the taxonomic rank of one of the S. betulina s. lato subspecies, Strand’s birch mouse S. betulina strandi Formosov, 1931, up to the species rank. The independence of the sibling species S. strandi and S. betulina (the latter will be considered further in a narrow sense) was based primarily on the karyotypic features: unlike the forest (=northern) birch mouse S. betulina s. str., the karyotype of which includes 32 chromosomes, Strand’s birch mouse has a set of 44 chromosomes (Sokolov et al., 1989). The degree of karyotypic differences (six translocations and five to six rearrangements such as changes in the centromere position and pericentric inversions) between the karyotypes of these species indicates that reproductive isolation has formed between them (Baskevich and Okulova, 2003; Kovalskaya et al., 2011). Currently, S. betulina s. str. and S. strandi along
with the gray birch mouse S. pseudonapaea Strautman, 1949 are considered as part of the betulina group (Sokolov and
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