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

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 14 C 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).

Coleoptera assemblages from the Quaternary deposits of Kizikha river, the southernmost late Pleistocene insects of the West Siberian Plain

“…Present day distribution areas of the remaining species are shifted to northern, eastern or southern directions ( Table 5). The same changes of the distribution range configuration are typical to species found in other late Pleistocene insect assemblages from the southern part of West Siberian Plain, and shows that climatic conditions at the end of Pleistocene were significantly different as compared to the present time (Zinovyev et al, 2016;Gurina et al, 2018Gurina et al, , 2019.…”

“…In addition, Carabidae domination is typical to Holocene assemblages of southeastern part of West-Siberian Plain (Gurina et al, 2016;Gurina, 2019). In spite of atypical taxa ratio in Kizikha-2 site the most part of the species are recorded previously in late Pleistocene fauna of south-east part of West Siberia (Zinovyev et al, 2016;Gurina et al, 2018Gurina et al, , 2019.…”

“…The species composition of sub-fossil insects from the sites Kizikha-1 and Kizikha-2 are extremely different. Only three species occur in sub-fossil assemblages of both sites, two species, Otiorhynchus altaicus (= O. karkaralensis Bajtenov, 1974) and O. ursus (= O. kasachstanicus Arnoldi, 1964), are common residents of sub-fossil assemblages in southern and central parts of West-Siberian Plain Zinovyev et al, 2016;Gurina et al, 2018Gurina et al, , 2019.…”

“…More than 130 sites with insect remains of different ages from Pleistocene to Holocene are known from this territory (Zinovyev, 2008(Zinovyev, , 2011Sheinkman et al, 2016;Rusakov et al, 2019). In a course of the expedition trips 2012-2014 in southern part of West Siberian Plain insect remains were found on banks of rivers Ob, Chik, Suzun, Chumysh, Alei, Ustianka and Kizikha (Tsepelev et al, 2013;Tshernyshev et al, 2013;Gurina et al, 2016Gurina et al, , 2018Gurina et al, , 2019Zinovyev et al, 2016). These studies increase our knowledge about late Pleistocene entomofauna of West Siberian Plain and indicating patterns of changes in insect assemblages along latitudinal -zonal gradient.…”

“…Полученные данные из местонахождений Кизиха-1 и Кизиха-2 дополнили известные ранее сведения по широтно-зональному распределению позднеплейстоценовых жесткокрылых Западно-Сибирской равнины. Как цитировать эту статью: Gurina A.A., Dudko R.Yu., Prosvirov A.S., Tshernyshev S.E., Legalov A.A., Zinovyev E.V. 2019.…”