@article{SyrykhNazarovaHerzschuhetal.2017, author = {Syrykh, Lydmila S. and Nazarova, Larisa B. and Herzschuh, Ulrike and Subetto, D. A. and Grekov, I. M.}, title = {Reconstruction of palaeoecological and palaeoclimatic conditions of the Holocene in the south of the Taimyr according to an analysis of lake sediments}, series = {Contemporary Problems of Ecology}, volume = {10}, journal = {Contemporary Problems of Ecology}, publisher = {Pleiades Publ.}, address = {New York}, issn = {1995-4255}, doi = {10.1134/S1995425517040114}, pages = {363 -- 369}, year = {2017}, abstract = {A sediment core from Khatanga-12 Lake (Taimyr Peninsula, Krasnoyarsk krai) has been studied. The 131.5-cm-long core covers ca. 7100 years of sedimentation. Chironomid analysis, a qualitative reconstruction of the paleoenvironment in the region, and a quantitative reconstruction of variations of the mean July air temperature and in the water depth of the lake have been performed using Northern Russia chironomid-inferred mean July temperature models (Nazarova et al., 2008, 2011, 2015). Khatanga-12 Lake was formed during the Middle Holocene warming as a result of thermokarst processes. The development of the lake ecosystem at different stages of its development was influenced by climatic and cryolithogenic factors. The Middle Holocene warming, which occurred around 7100-6250 cal. years BP, activated thermokarst processes and resulted in the formation of the lake basin. Later, between 6250 and 4500 cal. years BP, a period of cooling took place, as is proved by chironomid analysis. The bottom sediments of the lake during this period were formed by erosion processes on the lake shores. The reconstructed conditions were close to the modern after 2500 cal. years BP.}, language = {en} } @article{FrolovaIbragimovaSubettoetal.2017, author = {Frolova, Larissa A. and Ibragimova, A. G. and Subetto, D. A. and Nazarova, Larisa B. and Syrykh, Lydmila S.}, title = {Paleoecological and paleoclimatic reconstructions for the Karelian Isthmus based on the study of subfossil cladocerans from Lake Medvedevskoe (Northwest Russia)}, series = {Uč{\"e}nye Zapiski Kazanskogo Universiteta. Seri{\^a} Estestvennye Nauki}, volume = {160}, journal = {Uč{\"e}nye Zapiski Kazanskogo Universiteta. Seri{\^a} Estestvennye Nauki}, number = {1}, publisher = {Kazan Federal University}, address = {Kazan}, issn = {2542-064X}, pages = {93 -- 110}, year = {2017}, abstract = {The purpose of our study is to reconstruct the climatic and environmental changes that took place over the Holocene in Northwest Russia. The results of the palaeobiological analysis of cladoceran community of Lake Medvedevskoe (Karelian Isthmus, located between the Gulf of Finland of the Baltic Sea and Lake Ladoga, Northwest Russia) have been discussed. In the sediments of Lake Medvedevskoe, we have identified 38 cladoceran taxa that belong to 7 families: Bosminidae, Holopedidae, Chydoridae, Daphnidae, Polyphemidae, Macrotricidae, and Sididae. It has been revealed that Bosmina (Eubosmina) longispina and Alonella nana are the most common for subfossil Cladocera community of the lake. Palearctic and Holarctic species are dominant. Both pelagic and littoral taxa are well represented in the lake. The down-core changes in cladoceran community allowed to identify five statistically significant zones. It has been discovered that the taxonomic richness of biological communities is low at the bottom of the core with the dominance of typical northern species and increases towards the sediment surface alongside with the rise of organic content in sediments. Based on the shifts in the taxonomic composition of cladoceran community, we have concluded upon the trophic status of the lake and climate changes. The obtained data have been compared with the results of the chironomid analysis that was performed earlier.}, language = {en} } @article{NazarovaSubettoSyrykhetal.2018, author = {Nazarova, Larisa B. and Subetto, D. A. and Syrykh, Lydmila S. and Grekov, I. M. and Leontev, P. A.}, title = {Reconstructions of Paleoecological and Paleoclimatic Conditions of the Late Pleistocene and Holocene according to the Results of Chironomid Analysis of Sediments from Medvedevskoe Lake (Karelian Isthmus)}, series = {Doklady Earth Sciences}, volume = {480}, journal = {Doklady Earth Sciences}, number = {2}, publisher = {Pleiades Publ.}, address = {New York}, issn = {1028-334X}, doi = {10.1134/S1028334X18060144}, pages = {710 -- 714}, year = {2018}, abstract = {The use of chironomids (Diptera: Chironomidae) as indicators of changes in natural and climatic settings allows one to reconstruct paleoclimatic and paleoenvironmental conditions. Based on the results of lithological and chironomid analyses, the loss on ignition (LOI) values, as well as the results of radiocarbon dating (C-14 AMS), new data on the paleoclimate in the Karelian Isthmus, in particular the quantitative reconstruction of the mean July temperature (T (July), A degrees C) in the Late Pleistocene and Holocene and the evolution of the ecosystem of Medvedevskoe Lake have been obtained.}, language = {en} } @article{NazarovaRazjigaevaDiekmannetal.2019, author = {Nazarova, Larisa B. and Razjigaeva, N. G. and Diekmann, Bernhard and Grebennikova, T. A. and Ganzey, L. A. and Belyanina, N. I. and Arslanov, K. A. and Kaistrenko, V. M. and Gorbunov, A. O. and Kharlamov, A. A. and Golovatyuk, L. V. and Syrykh, Lydmila S. and Subetto, D. A. and Lisitsyn, A. P.}, title = {Reconstruction of Holocene Environmental Changes in North-Western Pacific in Relation to Paleorecord from Shikotan Island}, series = {Doklady earth sciences}, volume = {486}, journal = {Doklady earth sciences}, number = {1}, publisher = {Pleiades Publ.}, address = {New York}, issn = {1028-334X}, doi = {10.1134/S1028334X19050143}, pages = {494 -- 497}, year = {2019}, abstract = {Results of a paleolimnological investigation of a well-dated lake sediment section from Shikotan Island (Southern Kurils) showed that from ca 8.0 to 5.8 cal ka BP a warm and humid period corresponding to middle Holocene optimum took place. Cooling thereafter corresponds to Neoglacial. A reconstructed from ca 0.9 to ca 0.58 cal ka BP warm period can correspond to a Medieval Warm Period. Cooling after 0.58cal ka BP can be correlated with the LIA. Marine regression stages were identified at ca 6.2-5.9, 5.5-5.1 and 1.07-0.36 cal ka BP. The general chronology of major climatic events of Holocene in the island is in accordance with the climate records from the North Pacific region. Revealed spatial differences in timing and magnitude of the Late Holocene climatic episodes (LIA, MWP) in the region needs further investigations.}, language = {en} }