Reconstruction of the History of the Thermokarst Lake During the Middle Holocene Based on the Analysis of Subfossil Cladocera (Siberia, Central Yakutia)
L. A. FROLOVA1, A. G. IBRAGIMOVA1, M. ULRICH2, S. WETTERICH3
1Kazan Federal University, 420008, Kazan, Kremlevskaya str., 18
2Leipzig University, 04103, Leipzig, Johannisallee, 19a
3Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473, Potsdam, Telegrafenberg, A43
Keywords: голоцен, субфоссильные Cladocera, термокарстовое озеро, Лено-Алданское междуречье, Центральная Якутия, Holocene subfossil Cladocera, thermokarst lake, Lena-Aldan interfluve, Central Yakutia
Abstract
The paper presents results of the cladoceran analysis of a 382 cm long lake sediment core, collected from a pingo in the alas Khara Bulgunnyakh in Central Yakutia. According to the Cladocera analysis the formation of the lake coincided with the Holocene climatic optimum ~6600 cal. yrs BP. Using cluster analysis we identified four statistically significant ecological zones that are based on changes in species composition of the subfossil cladoceran communities. The period of optimal conditions for Cladoceran is characterized by complex community structures and numerous cladoceran remains in sediments, which accumulated between 6500 and 6000 cal. yrs BP. The development of the thermokarst water body was rapid and its existence was short, amounting at a total of ~800 years.
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