First Data on the Contact Zone and Hybridization between the Cryptic Species of Shrews Sorex araneus and S. satunini (Eu
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RAL BIOLOGY
First Data on the Contact Zone and Hybridization between the Cryptic Species of Shrews Sorex araneus and S. satunini (Eulipotyphla, Mammalia) V. V. Stakheeva,*, M. A. Makhotkina, O. O. Grigoryevab, S. A. Kornienkoc, A. A. Makarikovc, N. V. Panasjuka, and V. N. Orlovb Presented by Academician V.V. Rozhnov Received April 23, 2020; revised May 27, 2020; accepted May 28, 2020
Abstract—For the first time, based on sequence variation of microsatellite loci and the mtDNA cytb gene fragment, population genetic structure of the common shrew and Caucasian shrew in their contact zone was investigated. It was demonstrated that, although there was no complete reproductive isolation between the species under consideration, the gene flow was considerably limited. These data testify to the established reliable reproductive barriers between the common shrew and Caucasian shrew. Keywords: hybridization, reproductive isolation, contact zone, cryptic species, common shrew, Caucasian shrew DOI: 10.1134/S0012496620050099
Contact zones of previously isolated populations, in which natural selection forms assortative mating in response to the reduced fitness of hybrids (“reinforcement”), are the useful models for studying the processes of speciation [1]. Such contacts are more often found in groups of geographically replacing closely related species, “superspecies,” including superspecies of the common shrew. The common shrew, Sorex araneus L., widespread in the Palaearctic, in Western Europe forms two types of contacts with closely related cryptic species. Namely, range overlap without hybridization with Millet’s shrew, S. coronatus Millet, and a contact with narrow hybrid zone, with Valais shrew, S. antinorii Bonaparte [2]. The contact zone between the common shrew and Caucasian shrew, Sorex satunini Ognev, remained unexplored. Earlier, using data on the karyotype and the mtDNA cytochrome b (cytb) gene, the distribution of the common shrew along the lower Don River and the Kagalnik River, west of the settlement of Samara The
Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, 344006 Russia b Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, 119071 Russia c Institute of Systematics and Ecology of Animals, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia *e-mail: [email protected]
skoe (Fig. 1a), and Caucasian shrew, 140 km to the south along the Beysug River, was established [3]. In this study, the first data on the contact zone and hybridization between the common shrew and Caucasian shrew are presented. During the study of shrew populations in 2013 and 2016 in the floodplain of the Kugo-Eya River, a cohabitation area of these species in the vicinity of the Cossack village Kushchevskaya, 40 km south of the settlement of Samarskoe (Fig. 1a, 3) was revealed. The experiments were performed using tissue specimens of shrews caught in the Azov–Kuban Lowland and the Western Caucasus (Table 1). A total of 54 tissue specimens were examined, of whic
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