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Lemmus Amurensis) in the Late Pleistocene – Holocene in the Southern Far East of Russia

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Lemmus Amurensis) in the Late Pleistocene – Holocene in the Southern Far East of Russia Russian J. Theriol. 9(1): 3337 © RUSSIAN JOURNAL OF THERIOLOGY, 2010 The distribution history of the Amur brown lemming (Lemmus amurensis) in the Late Pleistocene Holocene in the southern Far East of Russia Mikhail P. Tiunov* & Valeria E. Panasenko ABSTRACT. Fossil bone remains of Amur (Lemmus amurensis) and wood (Myopus schisticolor) lem- mings were obtained from the Late Pleistocene-Holocene deposits at the Medvezhiy Klyk Cave (Primorski Kray). These species were differentiated based on proportions of M3. Bone remains of Amur lemming occur throughout the exposed thickness of loose deposits in the Medvezhiy Klyk Cave from the depth of 5.4 m and almost to the surface. The occurrence confirms a hypothesis of a relict status of recent Amur lemming and its wider distribution in the Late Pleistocene. KEY WORDS: distribution, Holocene, Late Pleistocene, Lemmus amurensis, Myopus schisticolor, Far East, Russia. Mikhail P. Tiunov [[email protected]] and Valeria E. Panasenko, Institute of Biology and Soil Science Far East Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia. Ê èñòîðèè ðàñïðîñòðàíåíèÿ àìóðñêîãî ëåììèíãà (Lemmus amurensis) â ïîçäíåïëåéñòîöåí ãîëîöåíîâîì âðåìåíè íà òåððèòîðèè þãà Äàëüíåãî Âîñòîêà Ðîññèè Ì.Ï. Òèóíîâ, Â.Å. Ïàíàñåíêî ÐÅÇÞÌÅ.  ïîçäíåïëåéñòîöåí-ãîëîöåíîâûõ îòëîæåíèÿõ ïåùåðû Ìåäâåæèé Êëûê (Ïðèìîðñêèé êðàé) îáíàðóæåíû êîñòíûå îñòàòêè àìóðñêîãî è ëåñíîãî ëåììèíãîâ. Îïðåäåëåíèå ýòèõ âèäîâ ïðîâîäèëîñü ïî M3. Âñòðå÷àåìîñòü êîñòíûõ îñòàòêîâ àìóðñêîãî ëåììèíãà ïî âñåé òîëùå âñêðûòûõ ðûõëûõ îòëîæåíèé ïåùåðû Ìåäâåæèé Êëûê, íà÷èíàÿ ñ ãëóáèíû 5,4 ì è ïî÷òè äî ïîâåðõíîñòè, ïîäòâåðæäàåò ãèïîòåçó î ðåëèêòîâîñòè ñîâðåìåííûõ àìóðñêèõ ëåììèíãîâ è áîëåå øèðîêîì ðàñ- ïðîñòðàíåíèè èõ â ïîçäíåì ïëåéñòîöåíå. ÊËÞ×ÅÂÛÅ ÑËÎÂÀ: ðàñïðîñòðàíåíèå, ãîëîöåí, ïîçäíèé ïëåéñòîöåí, Lemmus amurensis, Myopus schisticolor, Äàëüíèé Âîñòîê, Ðîññèÿ. The Amur lemming (Lemmus amurensis Vinogra- identify fossil lemming species (Agadzhanyan, 1972; dov) is a rare relict species that is widely distributed Smirnov et al., 1997; Chaline et al., 1989). from Transbaikalia and the Amur River to Kamchatka Currently, no lemming species are known in the and the Verkhoyansk Range (Gromov & Erbaeva, 1995; area near the Medvezhiy Klyk Cave. The southern Andreev et al., 2005). The habitats of the species are boundary of the wood lemming (Myopus schisticolor typically situated in forest wetlands and highlands, and (Lilljeborg)) range in Primorski Kray lies 300 km to the their basic food consists of green mosses. Fossils of the north of the cave (Kostenko, 2000). The nearest habitat Amur brown lemming were only known from the mid- of the Amur brown lemming is in the Amur Oblast at dle and upper Pleistocene of the Baikal region (Abram- the headwaters of the Zeya River. In addition to these son, 1993; Khenzykhenova, 2001). two species, there are two more Lemmus species in the Lemming fossils were obtained from deposits in the Far East with similar teeth structure: the Siberian brown Medvezhiy Klyk Cave (located at the crest of the Lozo- lemming (L. sibiricus (Kerr)), found on Wrangel Is- vy Range in the Partizansk District of Primorski Kray) land, and the North American brown lemming (L. tri- (Tiunov & Panasenko 2007). Examination of third up- mucronatus (Richardson)), widely spread from the right per molars revealed the presence of two morphological bank of the Lower Kolyma to the eastern part of the types of lemmings (tribe Lemmini): Lemmus and Myo- Chukchi Peninsula and the Anadyr Lowlands. The ranges pus. Molars of Lemmus are comparatively more elon- of these species, which inhabit tundra landscapes, are gated and narrow, whereas the grinding surface in Myo- quite distant from the area of the study. The most recent pus is relatively broad and short. As has been shown explanation for this is that approximately 25-15 ka ago, previously, researchers can use molar proportions to the brown lemming moved westward into the Chukchi 34 Table 1. Measurements of M3 (in mm) of recent Myopus schisticolor and Lemmus amurensis and fossil Myopus schisticolor and Lemmus amurensis from the Medvezhiy Klyk locality. Myopus schisticolor Lemmus amurensis Length Width WM3/LM3 index N Length Width WM3/LM3 index N minmax mean minmax mean minmax mean minmax mean minmax mean minmax mean Recent 1.712.65 2.21 1.121.65 1.37 0.580.71 0.62 51 2.02.75 2.3 1.01.4 1.19 0.470.59 0.52 47 M.P. Tiunov&V.E.Panasenko Layer 3 2.052.4 2.23 1.251.45 1.37 0.6062 0.61 3 Layer 34 2.45 1.55 0.63 1 Layer 5 2.25 1.5 0.67 1 2.22.5 2.4 1.251.4 1.33 0.540.57 0.56 3 Layer 567 2.252.35 2.28 1.351.5 1.43 0.60.64 0.63 3 2.15 1.2 0.56 1 Layer 7 2.35 1.4 0.6 1 Layer 67 1.952.9 2.20 1.21.55 1.38 0.60.68 0.63 10 2.32.75 2.48 1.251.5 1.37 0.540.56 0.55 3 Layer 678 2.052.55 2.31 1.31.6 1.43 0.60.64 0.62 11 2.152.65 2.36 1.11.35 1.26 0.480.57 0.54 13 Layer 789 2.02.4 2.25 1.351.45 1.4 0.60.68 0.62 5 2.452.6 1.31.45 0.530.56 2 Layer 89 2.252.45 1.351.5 0.60.61 2 2.3 1.3 0.56 1 Layer 9 2.22.75 2.35 1.351.65 1.47 0.60.68 0.62 16 2.12.65 2.41 1.151.5 1.33 0.520.57 0.55 13 Layer 91011 2.12.65 2.32 1.351.65 1.46 0.60.67 0.63 12 2.252.55 2.38 1.251.4 1.32 0.530.57 0.55 5 Layer 11 2.052.6 2.36 1.31.6 1.46 0.60.7 0.62 33 2.252.6 2.42 1.151.45 1.34 0.510.57 0.55 10 Layer 12 1.752.5 2.34 1.11.55 1.45 0.60.67 0.62 24 2.152.75 2.44 1.051.5 1.33 0.480.57 0.54 31 Layer 13 2.45 1.55 0.63 1 2.45 1.35 0.55 1 Lemmus amurensis in the Late Pleistocene Holocene in the southern Far East of Russia 35 Figure 1. Distribution of width/length ratio (index) values (WM3/ LM3) in recent Lemmus amurensis and Myopus schisticolor. The overlap zone indicated stands for revealed fossil molars of intermediate morphology. Peninsula and populated it up to the mouth of the amurensis (WM3/LM3 = 0.480.57). The differences in Kolyma River (Chernyavsky et al., 1993). Therefore, proportion between them are clear from Figure 2. For of the known lemming species, the ones most likely to the remaining 57 teeth, the width/length ratio ranged be found among the bone remains in southern Primorie between 0.58 and 0.59. These teeth can represent either are the wood lemming and the Amur lemming. M. schisticolor or L. amurensis, and their identification In this report, we provide data on size of Ì3 in the to the species is impossible for the time being. modern Amur and wood lemmings. This work was The teeth of wood and Amur lemmings were dis- based on material collected by the Zoological Institute tributed vertically across almost the entire depth of RAS and the Institute of Biology and Soil Science FEB exposed unconsolidated deposits in the Medvezhiy Klyk RAS. Lower right molars of 51 of recent wood lem- Cave, from a depth of 5.4 m up to the surface. Based on mings from the Khabarovski Kray, Amurskaya Oblast lithologic features, cave deposits have been divided and Sakhalin Island were measured. Forty seven stud- into 13 layers. Deposits at the depth range of 1.081.18 ied specimens of Amur lemmings originated from the m (layer 7) were radiocarbon dated (based on the bear Amurskaya Oblast, Yakutia, and the Kamchatka Penin- bone) to 13.7914.2 ka cal. BP (GIN-13479). As the sula. MBS-10 binocular microscope with a micrometer layers bedding was flat and semi-steep, and the ground eyepiece was used for the measurements. Measure- was excavated in beds with 510 cm increment, some ments included the length and width of the third upper samples represent mixed material from neighbouring molars (LM3 and WM3). Length to width ratio (WM3/ levels (Table 1). LM3) was calculated too (Table 1). Based on the radiocarbon dating and faunal com- This study made it apparent that Amur and wood position, layers 35 were assigned to Holocene, and lemmings cannot be differentiated based on the abso- layers 613, to the Late Pleistocene. In morphotypes lute dimensions of the grinding surface (Ì3), as the present, Holocene and Late Pleistocene lemmings do dimensions almost completely overlapped. In contrast, not differ from modern lemmings. In size, however, the proportions (i.e., width to length ratio of the grind- they are slightly larger than modern lemmings, similar ing surface of M3) showed marked distinctions (Fig. 1). to Pleistocene lemmings from the Baikal region (Khen- Using 263 third upper molars excavated from de- zykhenova, 2001). posits of the Medvezhiy Klyk Cave, 123 teeth were Analysis of the obtained material was objective assigned to the lemming species M. schisticolor (WM3/ enough to suppose that the wood lemming inhabited the LM3 = 0.600.68), and 83 teeth were identified as L. location for the entire period under investigation, ex- 36 M.P.
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