Coleoptera assemblages from the Quaternary deposits of Kizikha river, the southernmost late Pleistocene insects of the West Siberian Plainстатья
Статья опубликована в журнале из списка RSCI Web of Science
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из перечня ВАК
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 20 декабря 2019 г.
Аннотация:Two sites with insect remains were found in an exposure on the bank of
Kizikha river, in the Rubtsovskii District of the Altaiskii Krai of Russia, Kizikha-1 with
radiocarbon age 13455±150 14C BP (SPb-1347), and Kizikha-2 with the age 26094±400
14C BP (SPb-1418). This period is coincides with Sartan stadial and Kargin interstadial
(MIS 2 and MIS 3). This is the southernmost late Pleistocene insect bearing deposit found
in West Siberia. The fragments in both sites are represented mainly by Coleoptera. Beetle
fauna from the site Kizikha-1 is represented by 34 species from 9 families. The majority of
fragments belong to weevils and ground beetles. 28 species from 8 families are found in
Kizikha-2 site, the majority of fragments belong to Carabidae. 7 species found in the sites,
Dyschiriodes rufimanus, Cymindis cf. rostowtzowi (Carabidae), Cidnopus cf. parallelus,
Pristilophus punctatissimus (Elateridae), Hemitrichapion alexsandri (Brentidae), Paophilus
albilaterus and Otiorhynchus sushkini (Curculionidae), are recorded in Pleistocene
deposits for the first time. Sub-fossil insect assemblages of the two sites coincides with the late Pleistocene “Otiorhynchus-type” sub-fossil insect fauna from southeastern part of
West-Siberian Plain (Zinovyev, 2011; Legalov et al., 2016) with characteristics as follows:
dominance of steppe species, presence of halophile species, lack of forest species. Most of
these species are absent in the contemporary regional fauna. The complex of eastern species
and presence of endemics of Altai-Sayan Mountain system is also characteristic to the both
studied sites. Specifics of the deposit assemblages in comparison with the other late
Pleistocene fauna of West Siberian Plain is in high share of meadow species that could be
explained by taphonomic condition of sedimentation or microclimatic conditions caused by
close location to Altai mountains. Analysis of sub-fossil insect fragments showed that open
landscapes with zonal steppe and sparse meadow vegetation near rivers and in depressions
were typical for this area. In comparison to contemporary conditions climate was dry and
cold, but Kizikha-2 (end of MIS 3) was formed in more mild climate conditions than
Kizikha-1 (end of MIS 2). Results gained from Kizikha-1 and Kizikha-2 sites are complementing data on latitudinal-zonal distribution of beetles found in late Pleistocene deposits in West Siberian Plain.