Late Holocene malacofauna-based paleoenvironmental reconstruction for the Bazaikha River and Tartat River valleys (Krasnoyark Depression, Central Siberia)

• Published in: IOP Conference Series: Earth and Environmental Science
• Main Authors: Makarchuk, D E, Yamskikh, G Yu, Lebedeva, N V, Brungardt, V O, Bochka, V V
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2020
• Subjects: Morse; morse; Siberia
• Online Access: http://dx.doi.org/10.1088/1755-1315/438/1/012015; https://iopscience.iop.org/article/10.1088/1755-1315/438/1/012015/pdf; https://iopscience.iop.org/article/10.1088/1755-1315/438/1/012015

Abstract The results of malacofauna-based palaeoenvironment reconstructions for the Late Holocene in the valleys of Bazaikha and Tartat rivers (Krasnoyarsk depression) are presented. Palynological analyses of the flood-plain deposits and radiocarbon dating complemented malacofaunal analysis. Biodiversity of malacofauna is represented by 7 freshwater species and 15 land species. Species belonging to the Valloniidae Morse, 1864 and Lymnaeidae Rafinesque, 1815 families are dominant in the fossil assemblages. The finding of Gastrocopta theeli shell in the Late Holocene deposits of the Bazaikha section is the first one in the territory of Krasnoyarsk depression. This finding supports the relic, spotted character of the geographic range of this species. Emploting malacofauna proxies and the Eleneva Cave reference section palynological record enabled reconstructing Late Holocene palaeoenvironmental conditions in the area. Malacofauna in the valleys of Bazaikha and Tartat rivers developed under the conditions of gradual increase in heat availability and decreasing annual precipitation and warm-period precipitation during the last 2500 years. A reduction of malacofauna diversity 950 years ago was caused by a change in the precipitation regime.