914 tocLate Pleistocene insects from the Dubrovino site at Ob River (West Siberia, Russia) and their paleoenvironmental significance

Anna A. Gurina, Roman Yu. Dudko, Sergey E. Tshernyshev, Eugeny V. Zinovyev, and Andrei A. Legalov

Article number: 22.1.3
https://doi.org/10.26879/914
Copyright Paleontological Society, January 2019

Author biographies
Plain-language and multi-lingual abstracts
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Submission: 11 August 2018. Acceptance: 10 December 2018

ABSTRACT

A blue-grey clay loam lens with plant and insect remains was found in an exposure of the Ob River, 2 km upper Dubrovino village in Novosibirskaya Oblast of Russia. Conventional radiocarbon dating of the Dubrovino deposit is ca 19,444±159 14C BP (23,234±338 cal yr BP) and coincides with Sartan glaciation period (MIS 2). Ninety-two Coleoptera species, dominated by fragments of Curculionidae and Carabidae are represented in the Dubrovino deposit. Species of the tundra-steppe fauna are dominant, followed by meadow-dwelling taxa and coniferous forest taxa. A comparison of the Dubrovino assemblage with the previously studied late Pleistocene Kalistratikha and Bunkovo fossil assemblages showed that tundra-steppe landscapes with coniferous groves and sparse meadow vegetation were typical for this area from the end of Kargin interglacial (MIS 3) through the end of the Sartan glaciation (MIS 2).

Anna A. Gurina. Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, Frunze Street 11, Novosibirsk 630091, Russia. This email address is being protected from spambots. You need JavaScript enabled to view it.
Roman Yu. Dudko. Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, Frunze Street 11, Novosibirsk 630091, Russia. This email address is being protected from spambots. You need JavaScript enabled to view it.
Sergey E. Tshernyshev. Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, Frunze Street 11, Novosibirsk 630091, Russia and Tomsk State University, Lenina Prospekt 36, Tomsk 634050, Russia. This email address is being protected from spambots. You need JavaScript enabled to view it.
Eugeny V. Zinovyev. Institute of Plant and Animal Ecology, Ural Branch of Russian Academy of Sciences, Vos’mogo Marta Street 202, Yekaterinburg 620144, Russia. This email address is being protected from spambots. You need JavaScript enabled to view it.
Andrei A. Legalov*. Institute of Systematics and Ecology of Animals, Siberian Branch of Russian Academy of Sciences, Frunze Street 11, Novosibirsk 630091, Russia and Tomsk State University, Lenina Prospekt 36, Tomsk 634050, Russia. This email address is being protected from spambots. You need JavaScript enabled to view it.

Keywords: paleoecology; sub-fossil insects; late Pleistocene; paleoenvironment; Siberia

Gurina, Anna A., Dudko, Roman Yu., Tshernyshev, Sergey E., Zinovyev, Eugeny V., and Legalov, Andrei A. 2019. Late Pleistocene insects from the Dubrovino site at Ob River (West Siberia, Russia) and their paleoenvironmental significancee. Palaeontologia Electronica 22.1.3A 1-18. https://doi.org/10.26879/914
palaeo-electronica.org/content/2019/2377-pleistocene-insects-ob-river

Copyright: January 2019 Paleontological Society.
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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INTRODUCTION

Insect remains in Quaternary deposits have typically been found in the temperate and high latitudes, and are especially well-preserved in permafrost regions. These fossils are widely used for the reconstruction of past environments (Nazarov, 1984; Elias, 1994; Coope and Lemdahl, 1995; Sher et al., 2005). Chitin is poorly preserved in tropical and subtropical regions, although insect diversity and abundance is much greater there (Buckland and Coope, 1991).

Late Pleistocene insects are known from deposits on the southern part of the West Siberian Plain and have recently been described from sites in the territory of Novosibirskaya Oblast and Altaiskii Krai (Tsepelev et al., 2013; Tshernyshev et al., 2013; Zinovyev et al., 2016; Kuzmina, 2017; Gurina et al., 2018). One of the fossil deposits was discovered in the bank of Ob River near Dubrovino Village (ca 55°27′ N), with calibrated radiocarbon age of 23,234±338 cal BP (SPb-1417), that coincides with Marine isotope stage 2 (MIS 2) and the Sartan glaciation period according to Siberian regional scale. Similar age Quaternary insect deposits have not previously been described from the southern and central parts of the West Siberian Plain. This paper presents data on the fossil Coleoptera from this deposit as well as a paleoenvironmental reconstruction based on the insect faunal assemblage.

STUDY AREA

s figure1The Dubrovino deposit is located in the southern part of forest zone of West Siberian Plain (Figure 1). Pine forests including Pinus sibirica Du Tour, Betula pendula Roth., B. alba L., Sorbus sibirica Hedl. and rarely with Larix sibirica Ledeb. are represented in the studied area. The regional climate is continental with great changes in air temperature on a daily, seasonal and annual basis; the annual precipitation ranges from 380-430 mm. The average temperature of the warmest month, July, is +19.3 °С, and the coldest, January, is -17.7 °С (Luchitskaia et al., 2014).

GEOLOGICAL SETTINGS

The deposit is located on the right bank of the Ob River, 2 km above Dubrovino village in Moshkovskii District of the Novosibirkaya Oblast of Russia, 40 km north of Novosibirk city. The site coordinates are: 55°27'07.0'' N, 83°15'17.7'' E. The deposit is in a 13 m cliff. The lower part of the sequence, at 12.6-12.9 m depth, contains alluvial detritus with insect remains. Samples for entomological and radiocarbon analysis were taken from this organic-rich deposit in August 2014. A sedimentary description of the Dubrovino deposit profile is presented in Table 1 and Figure 2.

MATERIAL AND METHODS

s figure2Sampling methods follow those of Сооре (1959) with later updates (Medvedev, 1968; Morgan, 1969, 1988; Nazarov, 1984; Kiselev et al., 1987). For geological description of the profile and to prevent contamination by modern insect fragments, the upper layer in the cliff was cleaned to produce a fresh exposure. The layer of sediments containing detritus and insect remains was placed in a large volume of filtered river water. The suspension was then washed through the sieve with cell diameter 0.3 mm. The sediment, containing a mixture of plant detritus and insect fragments, was examined, and the insect remains were placed in a vial with 30% alcohol. Other detritus containing chitin was collected in a plastic bag. Further study of these samples took place in the laboratory. The sample was sieved meshes of 3 mm, 1 mm and 0.3 mm, respectively. The sieved fractions were air-dried, and the remaining insect fragments were picked under a binocular microscope.

The fragments were mounted with water-soluble glue onto entomological cards or placed in general plate, as each fragment was given a number entered into a digital database. Each fragment was then studied and identified by taxonomic specialists of the different beetle groups.

The sample was dated by radiocarbon analysis, yielding an age of 19,444 ± 159 14C BP (SPb-1417). The calibrated age using the Calpal Online (http://www.calpal-online.de) is 23,234±338 cal yr BP. This age coincides with the beginning of MIS 2 or Sartan glaciation of the late Pleistocene.

RESULTS

Taxonomic Composition of Beetles in the Dubrovino Assemblage

s figure3Fossil beetle results are presented in Table 2. Photos of fossil insects are presented in Figure 3-Figure 4. A total of 92 beetle species from 15 families were identified from the Dubrovino deposit. The faunal composition was as follows: 74% of the fauna were weevils and carabids (33 and 34 species, s figure4respectively), 6% were pill beetles (Byrrhidae, 5 species), and each of the remaining 12 families were represented by just 1-3 species. The majority of species in the assemblage are typical of late Pleistocene deposits from the southern and central parts of West Siberia (Zinovyev, 2011, Legalov et al., 2016; Zynovyev et al., 2016), but a number of species are recorded here for the first time, namely: Nebria cf. rubrofemorata Shilenkov, 1975; Trechus cf. compactulus Belousov and Kabak, 1996; Pterostichus cf. tomensis (Gebler, 1847); Aphodius multiplex Reitter, 1867; Stephanocleonus favens Faust, 1884; S. isochromus Suvorov, 1912; Lixus paraplecticus (Linnaeus, 1758); Ceutorhynchus ignitus Germar, 1823; Otiorhynchus beatus Faust, 1890; and O. janovskii Korotyaev, 1990.

The majority of fragments (N = 1050, 72%) from the deposit belong to Curculionidae, next numerous (201 fragments, 14%) are Carabidae, and fragments of remaining species share 13%. Otiorhynchus Germar, 1822 specimens are the most numerous (897 fragments, 55%), dominated by two closely related species O. altaicus Stierlin, 1861; and O. ursus Gebler, 1844 (550 fragments, 39%), and also O. obscurus Gyllenhal in Schoenherr, 1834 (84 fragments); and O. politus Gyllenhal in Schoenherr, 1834 (51 fragments). Also abundant are Tournotaris bimaculata (Fabricius, 1787) (Curculionidae) (65 fragments, 5%); and Poecilus (Derus) spp. (Carabidae) (31 fragments, 2%).

Ecological Groups

The ecological preferences of the insects found in the Dubrovino deposit are diverse and represent members of steppe, forest, tundra, meadow, water and saline species-complexes.

The steppe complex is the best-represented, based on the number of species and specimens. Xerophilous and meso-xerophilous beetles typical of steppe habitats, including Poecilus ravus (Lutshnik, 1922); Poecilus fortipes (Chaudoir, 1850); Pterostichus macer (Marsham, 1802); Cymindis arctica Kryzhanovskij and Emetz, 1979; Metadonus distinguendus (Boheman in Schoenherr, 1842); Tychius albolineatus Motschulsky, 1860; Stephanocleonus eruditus Faust, 1890; S. favens; S. fossulatus (Fischer von Waldheim, 1823); S. isochromus; S. leucopterus (Fischer von Waldheim, 1823); Phyllobius femoralis Boheman in Schoenherr, 1842; Otiorhynchus beatus; O. altaicus; O. ursus; O. obscurus; O. unctuosus Germar, 1823. Most of these are known from other late Pleistocene assemblages in the south and central part of the West Siberian Plain that have also yielded cold-dry environmental reconstructions (Zinovyev, 2011; Tshernyshev et al., 2013; Zinovyev et al., 2016; Legalov et al., 2016).

Forest species are represented in the fossil assemblage by only four species, i.e., Notiophilus fasciatus Mäklin, 1855; Pterostichus tomensis; Hylobius excavatus (Laicharting, 1781); and Pissodes insignatus Boheman in Schoenherr, 1843. These are typical of coniferous (taiga) forests and indicate the presence of conifers in the study region at the beginning of MIS 2.

Cold-adapted boreo-arctic species that inhabit tundra and forest-tundra ecotone regions include Diacheila polita (Faldermann, 1835); P. (Cryobius) spp.; Notaris aethiops (Paykull, 1792); Lepyrus nordenskioldi Faust in Sahlberg, 1887; and Hypera ornata (Capiomont, 1868).

Species typical of various meadow habitats are as follows: Trechus compactulus; Olisthopus sturmii (Duftschmid, 1812); Phyllobius virideaeris (Laicharting, 1781); Polydrusus amoenus (Germar, 1823); Otiorhynchus grandineus Germar, 1823; and O. politus.

Quite diverse and abundant complex of species associated with moist habitats includes riparian species from the banks of streams (Nebria rubrofemorata; N. subdilatata Motschulsky, 1844), and species that occur near edge of shallow, standing water [Elaphrus riparius (Linnaeus, 1758); Cymbiodyta marginella (Fabricius, 1792); Cercyon sp.; Tournotaris bimaculatus (Fabricius, 1787); and Notaris aethiops]. Pterostichus mirus (Tschitschérine, 1894); Amara aurichalcea Germar, 1823; and Aegialia abdita Nikritin, 1975 inhabit river valleys, and Helophorus spp. represents the only aquatic beetle found.

The following species are associated with saline habitats: Pogonus iridipennis Nicolai, 1822; Pogonus punctulatus Dejean, 1828; and Centorus rufipes (Gebler, 1833).

Most of the phytophagous species from the assemblage feed plants of different families. Several species are associated with Carex L. (Tournotaris bimaculatus; Notaris aethiops), legumes (Tychius albolineatus; Hypera ornata; Sitona sp.), Brassicaceae (Ceutorhynchus ignitus), Umbelliferae (Lixus paraplecticus), chenopodiacious (Metadonus distinguendus) and Salix L. (Lepyrus spp.; Chlorophanus sibiricus Gyllenhal in Schoenherr, 1834). Two species that feed exclusively on Larix Mill. (Hylobius excavatus and Pissodes insignatus) and several moss-feeding species (Byrrhidae) were found. A significant share of fragments belong to predatory Carabidae (28 species) and Coccinellidae (2 species).

Comparison of the Fossil Species Composition with the Contemporary Fauna of the Region

The recent fauna of the upper Ob River territory is distinctly different from those found in the Dubrovino deposit. Only a quarter of the species occur today in the upper Ob River north of Novosibirsk (Table 2). Actually, these species range in different zones and have a broad ecological tolerance. Most of the species identified from the study site are absent in the upper Ob River region today. These species range to North, South or East from the region (Table 2).

s figure5Eastern species represent the highest proportion (28%) of the fossil assemblages. The recent range of eastern species includes the mountains of South Siberia. Some of them inhabit high elevation landscapes like mountain tundra or taiga (Nebria rubrofemorata; Pterostichus tomensis). Another species are the endemics of the mountain depressions and inhabit mostly steppe landscapes (Figure 5, Figure 6, Figure 7). Northern or boreal species were comparable with the recent ones. These are adapted to cold climatic conditions. Finally, southern species contribute one-fifth of the total species identified. These species are adapted to dry climatic conditions.

Reconstruction of MIS 2 Conditions at the Fossil Site

s figure6The species composition of insects in the Dubrovino deposit allows the reconstruction of a colder and more arid MIS 2 climate with strong steppic influences. The species with modern ranges to the north of the fossil site (Diacheila polita; Pterostichus (Cryobius) spp.; Notaris aethiops; Lepyrus nordenskioldi; and Hypera ornata) are indicators of colder-than-modern climate. The species of the steppe complex with modern ranges to south and sometimes to east from the Dubrovino site are indicators of dry climate. At the same time, the presence of forest-dwelling beetle species, including wood-feeding beetles, indicates the existence of forest vegetation in close proximity to the site. Thus, there may have been steppe landscapes at the site, developed under cold climatic conditions during the Last glaciation (MIS 2).

DISCUSSION

s figure7It is useful to compare the fossil insect fauna identified from the Dubrovino site with fossil assemblages from other sites in the central and southern parts of the West Siberian Plain (Figure 1) (Zinovyev, 2006, 2016; Zinovyev et al., 2016; Dudko et al., 2017; Gurina et al., 2018). The closest assemblage, in terms of chronology and locality, is from the Novaya Surtaika site on the right bank of the Isha River near its confluence with the Katun River in the foothills of the Northern Altai (52°14' N, 85°55' E; 21,389±400 14C BP [SPb-2299] and 18,248±250 14C BP [SPb-2415], or 25,648±603 cal yr BP and 21,918±390 cal yr BP). The Novaya Surtaika fauna includes the cold-adapted beetles, i.e., Diacheila polita; Pterostichus (Cryobius) sp.; Hemitrichapion tschernovi (Ter-Minassian, 1973); and Cymindis vaporariorum (Linnaeus, 1758), characterizing a colder climate than today. In addition, this complex includes beetle species typical of modern subalpine meadows of the humid regions of Atai-Sayan mountains (Notiophilus jakovlevi Tschitschérine, 1903; Pterostichus drescheri (Fischer von Waldheim, 1817); Eutrichapion rhomboidale (Desbrochers des Loges, 1870); Notaris altaicus (Legalov, 1997); Otiorhynchus grandineus; and bark beetle species, i.e., Phloeotribus spinulosus (Rey in Eichhoff, 1883) and Polygraphus poligraphus (Linnaeus, 1758), developing on fir. The species composition of the assemblage allows us to conclude that environmental conditions in the foothills of the Northern Altai during MIS 2 coincide with the modern environments of the Central Altai region, at the elevation ca 1,700 m a.s.l. The presence of forest species indicates that this region served as a refugium for boreal, moisture-loving fauna (Dudko et al., 2017).

The sample from the center of the Kul’egan-2247 profile (60°25' N, 75°50' E; 21,815±225 14C BP [SOAN-6837] or 26,091±553 cal yr BP) relates to the MIS 2 period in the central part of the West Siberian Plain. Cold-adapted, boreo-arctic and arctic beetle species predominate, including Pterostichus costatus (Ménétriés, 1851); P. (Cryobius) spp.; Tachinus cf. arcticus (Motschulsky, 1860); and Curtonotus alpinus (Paykull, 1790). Specimens of Morychus cf. viridis Kuzmina and Korotyaev, 1987 were also found. Steppe species were completely absent. The species composition of the assemblage reflects cold climate conditions in an open landscape much like modern tundra (Zinovyev, 2006).

Similar fossil insect assemblages have been described from the Tyurseda-Khadyta site in South Yamal (67°26' N, 69°57' E; 23,090±295 and 20,970±690 cal yr BP), and dominated by cold-adapted species such as Tachinus cf. arcticus; Curtonotus alpinus; Pterostichus (Cryobius) spp.; Chrysolina cf. septentrionalis (Ménétriès, 1851); Lepyrus nordenskioldi; Notaris aethiops; and Isochnus arcticus (Korotyaev, 1977). The species composition of the Tyurseda-Khadyta assemblage reflects cold climate conditions and moss-dwarf shrub tundra landscapes (Zinovyev, 2016).

Thus, fossil beetle assemblages from the northern and central parts of the plain are all indicative of arctic environments associated with cold climate and tundra-like open landscapes. While in the south, there were likely areas of dry steppe formed under cold dry climate. In the region of the Altai foothills climate was cold but with moisture levels favourable for the development of woody vegetation. The Dubrovino fossil assemblage agrees with the reconstruction of cold climate in the central part of North Eurasia during MIS 2 (Volkova and Mikhailova, 2001).

The species composition of the Dubrovino assemblage is similar to that of the Kalistratikha (52°58' N, 83°37' E; the end of MIS 3: 24,438±350 14C BP [SPb-1416] or 29,222±567 cal yr BP) and Bunkovo (55°04' N, 82°30' E; the end of MIS 2: 11,550±125 14C BP [SOAN-8806] or 13,515±398 cal yr BP) assemblages. Phytophagous beetles, especially the weevils Otiorhynchus altaicus (= O. karkaralensis Bajtenov, 1974) and O. ursus (= O. kasachstanicus Arnoldi, 1964), dominate these assemblages (Zinovyev et al., 2016; Gurina et al., 2018). The meadow complex is poorly represented, dominated by O. politus. Only a single species characterizes the forest complex. These facts indicate the presence of specific tundra-steppe landscapes with interspersed sparse coniferous trees and sparse meadow vegetation in the southern territories of the West Siberian Plain.

The results of Quaternary insect studies from deposits of the Last Glacial Maximum (beginning and middle period of MIS 2) from the territories of Western and Eastern Europe, and North-East Siberia, also indicate cold climatic conditions (Nazarov, 1979, 1984; Ponel, 1995; Kasse et al., 1998; Ponel et al., 2003; Sher et al., 2005).

The time interval ca 23,000-22,000 cal yr BP is considered the coldest period of the late Pleistocene in the Northern Hemisphere. This was the time of maximum glaciation north-west Eurasia and exposed shelves of the Arctic Ocean, extending from the British Islands in the west to the Novosibirsk Islands in the east (Hughes et al., 2016) that caused the formation of glacier-dammed lakes in the lowlands of West Siberia.

The climate was cold and dry due to large volumes of water frozen in continental ice sheets (Arkhipov and Volkova, 1994; Volkova et al., 2002; Simakova, 2006; Markova and Puzachenko, 2008; Simakova and Puzachenko, 2008; Hudges et al., 2016). The widest distribution of open tundra-type landscapes like periglacial forest-tundra, tundra-steppes or cold steppes with typical vertebrate faunas is characteristic of MIS 2 (ca 24,000-21,000 BP) (Simakova and Puzachenko, 2008).

CONCLUSION

A fossil insect assemblage from the Dubrovino site reflects cold and dry climate associated with the development of open landscapes with specific forest-steppe vegetation that differs from any modern environment. This reconstruction is supported by a number of cold- and dry-adapted species that are absent from this region today. Thus, the studied assemblage has no modern analogue, as the fossil assemblage species do not occur together in a single region today. Their modern ranges include localities that are north, south and east of the fossil locality. The characteristics of the fossil assemblage are compatible with the environmental conditions of the last (Sartan) glacial maximum in West Siberia, as reconstructed on the basis of entomological, vertebrate and palaeobotanical data (Arkhipov and Volkova, 1994; Borodin, 1996; Zinovyev, 2008). All these proxies clearly indicate the existence of cold-dry climate in the study region during MIS 2.

ACKNOWLEDGEMENTS

The authors are gratitude to M.A. Kul’kova (Herzen State Pedagogical University, Saint-Petersburg) for dating of the sample; we also thank M.S. Kireev (Novosibirsk) for the help in collecting of samples and V.K. Zinchenko (Novosibirsk) for the identification of some species. We are especially grateful to J. Cooter (Oxford University Museum of Natural History, UK) for his kind help with the final correction of the manuscript. The study was supported by the Russian Foundation for Basic Research (grant No. 16-04-01049-а) and the Federal Fundamental Scientific Research Programme for 2013-2020, grant No. VI.51.1.5 (АААА-А16-116121410121-7).

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