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ISSN 20751117, Russian Journal of Biological Invasions, 2015, Vol. 6, No. 1, pp. 1–5. © Pleiades Publishing, Ltd., 2015. Original Russian Text © Yu.A. Bazhenov, M.V. Pavlenko, V.P. Korablev, A.I. Kardash, 2014, published in Rossiiskii Zhurnal Biologicheskikh Invasii, 2014, No. 4, pp. 2–9. Current Distribution of the Striped Field Mouse (Apodemus agrarius Pallas, 1771) in Eastern Transbaikalia: New Findings in the Disjunction Area Yu. A. Bazhenova, b, M. V. Pavlenkoc, V. P. Korablevc, †, and A. I. Kardashd aDaursky State Nature Biosphere Reserve, ul. Komsomol’skaya 76, Nizhny Tsasuchey, Zabaikalsky krai, 674480 Russia bInstitute of Natural Resources, Ecology, and Cryology, Siberian Branch, Russian Academy of Sciences, ul. Nedorezova 16A, Chita, 672014 Russia email: [email protected] cInstitute of Biology and Soil Science, Far Eastern Branch, Russian Academy of Sciences, pr. 100letiya Vladivostoka 159, Vladivostok, 690022 Russia email: [email protected] dChita Plague Control Station, ul. Biologicheskaya 1, Chita, 672014 Russia Received November 12, 2013 Abstract—Materials on the new findings of the striped field mouse (Apodemus agrarius) in Transbaikalia, within an earlier disjunction area in the habitat of this species (in the basins of the Onon and Ingoda rivers), are presented. Possible causes of the expansion of the species range are discussed. It is most probable that the species was introduced from the basin of the Argun River with a cargo of agricultural products to the lower reaches of the Onon River or the upper reaches of the Shilka River. Currently, the striped field mouse is a com mon species inhabiting a floodplain shrub biotope in the lower reaches of the Ingoda and Onon rivers. Keywords: striped field mouse (Apodemus agrarius), Eastern Transbaikalia, invasion, disjunction area DOI: 10.1134/S2075111715010026 INTRODUCTION MATERIALS AND METHODS The striped field mouse (Apodemus agrarius Pallas, The materials presented in this work were obtained 1771) is widespread in the Palearctic region and is a during the joint expeditions of the Daursky State Nature Biosphere Reserve and the Institute of Biology highly abundant agrophilous rodent species in some and Soil Science, Far Eastern Branch, Russian Acad areas (Karaseva and Toshchigin, 1993; Tupikova et al., emy of Sciences, as well as in the course of regular cen 2000). Its range comprises two wide isolated part: suses of rodents performed by the Chita Plague Con European–Siberian–Kazakhstan and Far Eastern– trol Station (PCS) in the steppe and foreststeppe Chinese (Karaseva, 1979). This is an example of clas regions of Zabaikalsky krai. sical European–East Asian disjunction (Matyushkin, 1976), which is confined to the arid and mountain regions of Inner Asia. In Russia, the habitat disjunc RESULTS AND DISCUSSION tion of A. agrarius occurs in Transbaikalia (Buryatia In 1948, A. agrarius was first found in Transbaika and Zabaikalsky krai). lia, in Verkhnii Kaltan (15 km southwest of Soktui A. agrarius has significantly expanded its habitat Milozan), by Khokhlov, a zoologist (Lipaev et al., 1957). Subsequently and until recently, all the known over recent decades, which is associated with the eco habitats of A. agrarius in these regions were limited to nomic activity of humans (Karaseva et al., 1992; the floodplain of the Argun River in the steppe zone Tikhonova et al., 1992; Tupikova et al., 2000; Kos along Russia’s national boundary with China (Lipaev tenko, 2000). et al., 1957; Nekipelov, 1960). The aim of this communication is to describe the A. agrarius was caught in Transbaikalia, far beyond current distribution of A. agrarius in Transbaikalia on the floodplain of the Argun River, over the period from the basis of new findings of this species. 1999 to 2013 (table, figure). The findings of this spe cies in the basin of the Argun River, in the cultivated † Deceased. lands of Zabaikalsky and Krasnokamensk districts of 1 2 BAZHENOV et al. Area of finds and abundance of A. agrarius in Transbaikalia, 1999–2013 Abundance Number No. Area of trapping (locality) Year Biotope (specimens/ n of trapdays 100 trapdays) 1 Chita district, Tyrgyvken Rivulet (Chita River tribu 1 2012 Floodplain 0.1 1440 tary), 7 km west of VerkhChita village shrubs 2 Chita district, left bank of the Ingoda River, Novok 1 2013 Floodplain 0.5 200 ruchininskii village shrubs 3 Shilka district, right bank of the Ingoda River, 3 km 8 2013 Floodplain 7.4 108 west of Krasnoyarovo village shrubs 4 Shilka district, left bank of the Onon River, 6 km 1 2013 Floodplain 1.9 53 from the estuary shrubs 5 Shilka district, left bank of the Onon River, 6 km east 2 2012 Floodplain 1.9 52 of the estuary of the Aga River shrubs 6 Baley district, left bank of the Unda River, 2 km from 1 2009 Floodplain 2.9 35 the confluence into the Onon River shrubs 7 Border between Baley and Olovyanninskii districts, 1 2004 Floodplain 2.5 40 right bank of the Onon River, 10 km north of Karak shrubs sar village 8 Mogoitui district, left bank of the Onon River, 4 km 2 2013 Floodplain 4.0 50 north of Nurinsk village shrubs 9 AleksandrovoZavodskii district, Buldurutui Rivulet 1 2013 Floodplain 5.0 20 (tributary of the Verkhnyaya Borzya River), 3 km shrubs north of SavvoBorzya village 10 Priargunsk district, Priargunsk village 1 2006 Shrubs of 5.0 20 fallow fields near forest belts 11 Krasnokamenskii district, SoktuiMilozan village 2 1999 Field 2 100 13 2001 Field 13 100 1 2002 Field 1 100 12 Zabaikalsky district, Zabaikalsk village 1 2010 Village or sum 1100 mer cottage outskirts 13 Zabaikalsky district, 14 km east of Zabaikalsk village 1 1999 Field 1 100 8 2002 Field 8 100 14 Zabaikalsky district, Abagaitui village 2 2006 Field 2 100 Zabaikalsky krai, were made during the census trap Borzinskii district during 1986–1988 (Puzanskii, pings conducted by the Chita PCS (sites 11–14). It 1990). According to the map in the review paper by should be noted that A. agrarius was not registered Karaseva et al. (1992), there was only one finding of annually despite regular sensuring in the areas where the species outside the floodplain of the Argun River, the findings were made. During the short expeditions, i.e., on the Shilka River (probably in Nerchinsk dis one A. agrarius specimen each was found in Priar trict). Unfortunately, no detailed data on these find gunsk (site 10) and AleksandrovoZavodskii (site 9) ings are available. districts. The above findings of A. agrarius refer to the steppe areas in the basin of the Argun River but are In the lower reaches of the Onon River (on its right 50–70 km away from its floodplain. bank), 10 km north of Karaksar (on the border between Baley and Olovyanninskii district, site 7), an Only two findings of A. agrarius in Transbaikal krai, adult female A. agrarius specimen (parous, with 11 both yielding little information, were known outside placenta spots) was registered by us in September 2004 the steppe Argun River region before our trappings. (Pavlenko et al., 2007). During the expeditions orga A. agrarius is listed among 19 species of rodents and nized in subsequent years (2009, 2012, and 2013), lagomorphs caught in the anthropurgic stations of A. agrarius was caught in four other areas on the banks RUSSIAN JOURNAL OF BIOLOGICAL INVASIONS Vol. 6 No. 1 2015 CURRENT DISTRIBUTION OF THE STRIPED FIELD MOUSE 3 Amazar Am Mogocha az ar Ksen’evka lka Shi AksenovoZilovskoe Ust’Karsk N e r c h Chernyshevsk a VershinoDarasunskii r Sretensk u 1 im az Chita G k Nerchinsk o l i Shilka h 2 K Ingoda Urov 3 4 n u Darasun Pervomaiskii Baley Shelopugino g 5 a r Und A a r u 6 T Mogotui 7 Aginskoe 8 Ilya ga A Olovyannaya Aleksandrovskii Zavod 9 Dul’durga Onan a orzy B Borzya 10 Krasnokamensk Zun-Torei 11 Dauriya A MONGOLIA IN 12 CH 13 ldza U 14 Distribution of A. agrarius in Eastern Transbaikalia. Areas where smallsized mammals inhabiting floodplain shrubs were trapped in 1999–2013: A. agrarius detected (filled triangles) or not (empty triangles). Numbers of localities as in table. The map of global habitat according to (http://www.sevin.ru/vertebrates/). in the lower reaches of the Onon River (sites 4–8) and shrubs in the downstream flows of the Onon and one more area in the lower reaches of Ingoda River Ingoda rivers: Maximowicz’s vole (Microtus maxi (site 3). A. agrarius specimens from these six localities mowiczii Schrenk, 1859), northern redbacked vole were caught in the dense floodplain shrubs (willow, (Clethrionomys rutilus Pallas, 1779), Korean field Siberian crabapple, and wild rose) bordering the river mouse (Apodemus peninsulae Thomas, 1907), brown channels and meadow areas. rat (Rattus norvegicus Berkenhout, 1769), and Sibe In 2012 and 2013, the plague control service rian chipmunk (Tamias sibiricus Laxmann, 1769). The trapped one specimen of A. agrarius in each basin of share of A. agrarius relative to all mammals that were the Ingoda River within Chita district (sites 1, 2). It caught was 37% (sites 3–6, 8). should be emphasized that neither we nor other The findings of A. agrarius in the valleys of the researchers have registered A. agrarius in the valley of Onon and Ingoda rivers are of high interest, because the Ingoda River near the district’s largest transporta they were performed in the disjunction area of the vast tion center (Chita), although small mammals have range of this species. Taking into consideration that been trapped here more or less regularly. The recent the findings in the valley of the Onon River and in the findings are likely to be related to the habitat expan lower reaches of the Ingoda River were made during sion of A.

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