40. Flцssner D. Die Haplopoda und Cladocera (ohne Bosminidae) Mitteleuropas. - Leiden: Backhuys Publ., 2000. - 428 p.
41. Alonso M. Fauna Iberica. V. 7: Crustacea, Branchiopoda. - Madrid: Museo Nacional de Ciencias Naturales CSIC, 1996. - 486 p. (на исп. яз.)
42. Shannon C.E., Weaver W. The mathematical theory of communication. - Urbana: Univ. Illinois Press, 1963. - 117 p.
43. Pielou E.C. The measurement of diversity in different types of biological collections // J. Theor. Biol. - 1966. - V. 13. - P. 131-144. - doi: 10.1016/0022-5193(66)90013-0.
44. Pantle F., Buck H. Die biologische Ьberwachung der Gewдsser und die Darstellung der Ergebnisse // Gas- und Wasserfach. - 1955. - Bd 96, H. 18. - S. 604-620.
45. Количественные методы экологии и гидробиологии: Сб. науч. тр., посвящ. памяти А.И. Баканова / Отв. ред. чл.-корр. РАН Г.С. Розенберг. - Тольятти: СамНЦ РАН, 2005. - 404 с.
46. Juggins S. C2. Software for ecological and palaeoecological data analysis and visualization. Version 1.5 User guide. - Newcastle upon Tyne, UK: Newcastle University, 2007. - 73 p.
47. Grimm E.C. TGView 2.0.2 (Software). - Illinois, USA: Illinois State Museum. Springfield, 2004.
48. Chengalath R., Bruce W.J., Scruton D.A. Rotifer and crustacean plankton communities of lakes in insular Newfoundland // Verh. Int. Verein. Limnol. - 1984. - V. 22, No 1. - P. 419-430.
49. Nevalainen L. Sexual reproduction in chydorid cladocerans (Anomopoda, Chydoridae) in southern Finland - implication for paleolimnology: Doct. diss. - Helsinki: University of Helsinki, 2008. -55 p.
50. Смирнов Н.Н. Историческая экология пресноводных зооценозов. - М.: Т-во науч. изд. КМК, 2010. - 225 с.
51. Sarmaja-Korjonen K. Headshields of ephippial Chydorus piger Sars (Cladocera, Chydor- idae) females from northern Finnish Lapland: A long period of gamogenesis? // Hydrobi- ologia. - 1999. - V. 390, No 1-3. - P. 11-18. - doi: 10.1023/A:1003507300981.
52. Sarmaja-Korjonen K. Multi-proxy data from Kaksoislammi Lake in Finland: Dramatic changes in the late Holocene cladoceran assemblages // J. Paleolimnol. - 2002. - V. 28, No 3. - P. 287-296. - doi: 10.1023/A:1021611225821.
53. Sarmaja-Korjonen K. Chydorid ephippia as indicators of past environmental changes - a new method // Hydrobiologia. - 2004. - V. 526, No 1. -P. 129-136. - doi: 10.1023/B:HYDR.0000041595.08121.ab
54. Maemets A. Eesti vesikirbuliste (Cladocera) okoloogiast ja fenoloogiast // Hudrobi- oloogilised uurimused. - 1961. - V. 2. - P. 108-158. (на эст. яз.)
55. Sand0y S., Nilssen J.P. A geographical survey of littoral crustacea in Norway and their use in paleolimnology // Hydrobiologia. - 1986. - V. 143, No 1. - P. 277-286. - doi: 10.1007/BF00026671.
56. Frolova L. Subfossil Cladocera (Branchiopoda, Crustacea) in climatic and palaeoenviron- mental investigations in Eastern Siberia (Russia) // 16th Int. Multidiscip. Sci. GeoConf. SGEM 2016: Conf. Proc. - 2016. - Book 4, V. 2. - P. 601-606. - doi: 10.5593/SGEM2016/B42/S19.077.
57. Sladecek V. System of water quality from the biological point of view // Arch. Hydrobiol. Ergebnisse der Limnologie. - 1973. - Bd. 7. - P. 1-218.
58. Frolova L., Nazarova L., Pestryakova L., Herzschuh U. Subfossil Cladocera from surface sediment in thermokarst lakes in northeastern Siberia, Russia, in relation to limnological and climatic variables// J. Paleolimnol. - 2014. - V. 52, No 1. - P. 107-119. - doi: 10.1007/s10933-014-9781-7.
59. Ibragimova A.G., Frolova L.A., Grekov I.M. Results of subfossil Cladocera (Branchiopoda, Crustacea) analyses from bottom deposits of Lake Antyukh-Lambina (Kola Peninsula, Murmansk region) // Res. J. Pharm., Biol. Chem. Sci. - 2016. - V. 7, No 6. - P. 3201-3206.
60. Catalan J., Barbieri M.G., Bartumeus F., BituiikP., Botev I., Brancelj A., Cogalniceanu D., Manca M., Marchetto A., Ognjanova-Rumenova N., Pla S., Rieradevall M., Sorvari S., Stefkova E., StuchUk E., Ventura M. Ecological thresholds in European alpine lakes // Freshwater Biol. - 2009. - V. 54, No 12. - P. 2494-2517. - doi: 10.1111/j.1365- 2427.2009.02286.x.
61. Bledzki L.A., Rybak. J.I. Freshwater Crustacean Zooplankton of Europe: Cladocera & Copepoda (Calanoida, Cyclopoida) Key to species identification, with notes on ecology, distribution, methods and introduction to data analysis. - Springer, 2016. - 936 p.
62. Buczko K., Korponai J., Padisak J., Starratt S.W. (eds.) Palaeolimnological Proxies as Tools of Environmental Reconstruction in Fresh Water. - Springer, 2009. - 327 p.
63. Андроникова И.Н. Структурно-функциональная организация зоопланктона озерных экосистем разных трофических уровней. Автореф. дис. ... д-ра биол. наук. - Л., 1989. - 39 с.
64. Ulrich M., Wetterich S., Rudaya N., Frolova L., Schmidt J., Siegert C., Fedorov A.N., Zielhofer C. Rapid thermokarst evolution during the mid-Holocene in Central Yakutia, Russia. Holocene, 2017, vol. 27, no. 12, pp. 1899-1913. doi: 10.1177/0959683617708454.
65. Frolova L.A. Cladocera from bottom deposits as an indicator of changes in climate and ecological conditions. IOP Conf. Ser.: Earth Environ. Sci., 2017, vol. 107, art. 012084, pp. 1-4. doi: 10.1088/1755-1315/107/1/012084.
66. Demezhko D.Yu. Climate reconstruction of the Late Pleistocene-Holocene in the Urals by geothermal data. Doct. Geol.-Mineral. Sci. Diss. Yekaterinburg, 2001.222 p. (In Russian)
67. Frolova L.A. Cladocerans (Cladocera Latreille, 1829, Branchiopoda, Crustacea) in paleoecological research. In: Metodicheskie podkhody k ispol'zovaniyu biologicheskikh indikatorov v paleoekologii [Methodological Approaches to Using Biological Indicators in Paleoecology]. Nazarova L.B. (Ed.). Kazan, Kazan. Univ., 2011, pp. 52-87. (In Russian)
68. Kosareva L.R., Nurgalieva N.G., Frolova L.A., Gafiatullina L.I., Krylov P.S., Terekhin A.A., Tishin D.V., Batalin G.A., Gareev B.I., Kuzina D.M., Antonenko V.V., Akhmerov R.D. The integrated exploration of Raifa lake sediments and dendrochronological analysis of Raifa forestry pines. ARPNJ. Eng. Appl. Sci., 2017, vol. 12, no. 7, pp. 2192-2206.
69. Akramov Z.M., Kalesnik S.V., Vakhabov M.G., Dalimov N.D., Poslavskaya O.Yu., Smirnov N.V., Khisamov A.V., Tsapenko N.G. Sovetskii Soyuz. Geograficheskoe opisanie v 22 t. [Soviet Union. Geographical Description in 22 Vols. Uzbekistan]. Moscow, Mysl', 1967. 318 p. (In Russian)
70. Frolova L., Frolova A. Implification of ephippium analysis (Cladocera, Branchiopoda, Crustacea) for reconstruction of past environmental changes in Central Yakutia, Russia. 17th Int. Multidiscip. Sci. GeoConf. SGEM 2017: Conf. Proc., 2017, vol. 17, no. 41, pp. 481-486. doi: 10.5593/sgem2017/41/S19.061.
71. Rudaya N., Nazarova L., Nourgaliev D., Palagushkina O., Papin D., Frolova L. Middle-late Holocene environmental history of Kulunda, southern West Siberia: Vegetation, climate and humans. Quat. Sci. Rev., 2012, vol. 48, pp. 32-42. doi: 10.1016/j.quascirev.2012.06.002.
72. Frolova L.A., Ibragimova A. G., Ulrich M., Wetterich S. Reconstruction of the history of a thermokarst lake in the Mid-Holocene based on an analysis of subfossil Cladocera (Siberia, Central Yakutia). Contemp. Probl. Ecol., 2017, vol. 10, no. 4, pp. 423-430. doi: 10.1134/S1995425517040023.
73. Frey D.G. The ecological significance of cladoceran remains in lake sediments. Ecology, 1960, vol. 41, no. 4, pp. 684-699. doi: 10.2307/1931802.
74. Frey D.G. Cladocera analysis. In: Handbook of Holocene Palaeoecology and Palaeohydrology. Berglund B.E. (Ed.). Chichester, Wiley-Interscience, John Wiley & Sons Ltd., 1986, pp. 667-701.
75. Korhola A., Rautio M. Cladocera and other branchiopod crustaceans. In: Tracking Environmental Change Using Lake Sediments. Vol. 4: Zoological Indicators. Dordrecht, Kluwer Acad. Publ., 2001, pp. 125-165.
76. Rautio M., Nevalainen L. Cladocera. In: Encyclopedia of Quaternary Science. Elias S.A. (Ed.). Amsterdam, Elsevier, 2013, pp. 271-280.
77. Hann B.J. Methods in quaternary ecology #6. Cladocera. Geosci. Can., 1989, vol. 16, no. 1, pp. 17-26.
78. Lotter A.F., Birks H.J.B., Hofmann W., Marchetto A. Modern diatom, Cladocera, chironomid, and chrysophyte cyst assemblages as quantitative indicators for the reconstruction of past environmental conditions in the Alps. I. Climate. J. Paleolimnol., 1997, vol. 18, no. 4, pp. 395-420. doi: 10.1023/A:1007982008956.
79. Frolova L.A., Nazarova L.B., Pestryakova L.A., Herzschuh U. Analysis of the effects of climate- dependent factors on the formation of zooplankton communities that inhabit Arctic lakes in the Anabar River basin. Contemp. Probl. Ecol., 2013, vol. 6, no. 1, pp. 1-11. doi: 10.1134/S199542551301006X.
80. Frolova L., Nazarova L., Pestryakova L., Herzschuh U. Subfossil Cladocera from surface sediment in thermokarst lakes in northeastern Siberia, Russia, in relation to limnological and climatic variables. J. Paleolimnol., 2014, vol. 52, no. 1-2, pp. 107-119. doi: 10.1007/s10933-014-9781-7.
81. Frolova L., Ibragimova A., Fedorova I. Stratigraphy of Cladocera in a core from A Yamal Peninsula lake (Arctic Russia). Proc. 16th Int. Multidiscip. Sci. GeoConf. SGEM 2016, 2016, book 4, vol. 2, pp. 579-587. doi: 10.5593/SGEM2016/B42/S19.074.
82. Kuznetsov D.D. Transformation of paleobasins at the territory of the Karelian Isthmus in the Late Pleistocene and Holocene according to the study of lake bottom sediments. Extended Abstract of Cand. Georg. Sci. Diss. St. Petersburg, 2014. 22 p. (In Russian)
83. Subetto D.A. Donnye otlozheniya ozer: paleolimnologicheskie rekonstruktsii [Bottom Sediments of Lakes: Paleolimnological Reconstructions]. St. Petersburg, RGPU im A.I. Gertsena, 2009. 309 p. (In Russian)
84. Davydova, N.N. Late Pleistocene history of Lake Ladoga. In: Istoriya pleistotsenovykh ozer Vos- tochno-Evropeiskoi ravniny [The History of Pleistocene Lakes of the East European Plain]. Kho- mutova V.I. (Ed.). St. Petersburg, 1998, pp. 134-140. (In Russian)
85. Ibragimova A.G., Frolova L.A., Subetto D.A., Belkina N.A., Potakhin M.S. The changes in the composition of Cladocera community in bottom sediments of Lake Maloye Shibrozero (Zaonezhsky Peninsula) as a consequence of shifts of environmental and climatic conditions. IOP Conf. Ser.: Earth Environ. Sci., 2017, vol. 107, art. 012029, pp. 1-9. doi: 10.1088/17551315/107/1/012029.
86. Ibragimova A., Frolova L., Subetto D. Subfosil Cladocera from boreal lake Gahkozero (The Republic of Karelia, Russia) as paleoenvironmental proxies. 17th Int. Multidiscip. Sci. GeoConf. SGEM2017: Conf. Proc, 2017, vol. 17, no. 41, pp. 589-597. doi: 10.5593/SGEM2017/41/S19.07.
87. Gerasimov D.V., Subetto D.A. Belskii S.V. Cultural transformations in the context of environmental changes on the Karelian Isthmus and Northern Ladoga region during the Holocene. In: Khronologiya, periodizatsiya i krosskul'turnye svyazi v kamennom veke [The Chronology, Periodization and Cross-Cultural Communications in the Stone Age]. Vol. 1. Khlopachev G.A. (Ed.). St. Petersburg, Nauka, 2008, pp. 164-172. (In Russian)
88. Syrykh L.S., Nazarova L.B., Subetto D.A. Preliminary data on climate development in the territory of the Karelian Isthmus during the Holocene based on the results of chironomid and lithological analyses. Tr. Karel. Nauch. Tsentra, Ross. Akad. Nauk, Ser. Limnol., 2015, no. 5, pp. 53-59. (In Russian)
89. Saksa A.I. Karelian Isthmus: Natural and historical-geographical landscape formation. Arkheol., Etnogr. Antropol. Evrazii, 2006, no. 2, pp. 35-44. (In Russian)
90. Subetto D.A., Davydova N.N., Sapelko, T.V., Wohlfarth B., Vastegord S., Kuznetsov D.D. The climate of the Northwestern Russia at the turn of the Pleistocene and Holocene. Izv. Ross. Akad. Nauk, Ser. Geogr., 2003, no. 5, pp. 80-91. (In Russian)
91. Trifonova I.S., Afanasiev A.L., Rusanov, A.G., Stanislavskaya E.V. Plant communities of lakes in the central part of the Karelian Isthmus as indicators of their ecological status. Izv. Samar. Nauchn. Tsentra Ross. Akad. Nauk, 2014, vol. 16, no. 1, pp. 1034-1038. (In Russian)
92. Sennikov A.N. Phytogeographical regionalization of the northwestern European part of Russia (Leningrad, Pskov, and Novgorod regions). Biogeogr. Karelii. Tr. Karel. Nauchn. Tsentr Ross. Akad. Nauk, 2005, no. 7, pp. 206-243. (In Russian)
93. Andronikov A.V., Subetto D.A., Lauretta D.S., Andronikova I.E., Drosenko D.A., Kuznetsov D.D., Sapelko T.V., Syrykh L.S. In search for fingerprints of an extraterrestrial event: Trace element characteristics of sediments from the Lake Medvedevskoye (Karelian Isthmus, Russia). Dokl. Earth Sci., 2014, vol. 457, no. 1, pp. 819-823. doi: 10.1134/S1028334X14070022.
94. Subetto D.A., Wohlfarth B., Davydova N.N., Sapelko T.V., Bjorkman L., Solovieva N., Wastegard S., Possnert G., Khomutova V.I. Climate and environment on the Karelian Isthmus , northwestern Russia, 13 000-9000 cal. yrs BP. Boreas, 2002, vol. 31, no. 1, pp. 1-19. doi: 10.1111/j.1502- 3885.2002.tb01051.x.
95. Frey D.G. Littoral and offshore communities of diatoms, cladocerans and dipterous larvae, and their interpretation in paleolimnology. J. Paleolimnol., 1988, vol. 1, no. 3, pp. 179-191. doi: 10.1007/BF00177764.
96. Pestryakova L.A., Nikolaev A.N., Subetto D.A., Frolova L.A., Bobrov A.A., Gorodnichev R.M. Paleoekologiya. Metodologicheskie osnovy paleoekologii [Paleoecology. Methodological Basis for Paleoecology]. Yakutsk, Izd. Dom Sev.-Vost. Fed. Univ., 2016. 84 p. (In Russian)
97. Szeroczynska K., Saimaja-Korjonen K. Atlas of Subfossil Cladocera from Central and Northern Europe. Friends Lower Vistula Soc., 2007. 84 p.
98. Korosi J.B., Smol J.P. An illustrated guide to the identification of cladoceran subfossils from lake sediments in northeastern North America: Part 1 - the Daphniidae, Leptodoridae, Bosminidae, Poly- phemidae, Holopedidae, Sididae, and Macrothricidae. J. Paleolimnol., 2012, vol. 48, no. 3, pp. 571586. doi: 10.1007/s10933-012-9632-3z.
99. Frolova L.A. Cladocera. In: Biologicheskie indicatory v paleobiologicheskikh issledovaniyakh: Atlas [Biological Indicators in Paleobiological Investigations: Atlas]. Nazarova L.B. (Eds.). Kazan, Kazan. Univ., 2013, pp. 44-64. (In Russian)
100. Smirnov N.N. Fauna SSSR. Rakooobraznye [The Fauna of the USSR. Crustaceans].Vol. 1, No. 2: Chydoridae of the World Fauna. Moscow, Lenningrad, Nauka, 1971. 531 p. (In Russian)
101. Kotov A.A., Sinev A.Yu., Glagolev S.M., Smirnov N.N. Cladocerans (Cladocera). In: Opredelitel' zooplanktona i zoobentosa presnykh vod Evropeiskoi Rossii [Identification Key of Zooplankton and Zoobenthos of European Russian Freshwaters]. Vol. 1: Zooplankton. Alekseev V.R., Tsalolikhin S.Ya. (Eds.). Moscow, T-vo. Nauchn. Izd. KMK, 2010. pp. 151-276. (In Russian)
102. Flцssner D. Die Haplopoda und Cladocera (ohne Bosminidae) Mitteleuropas. Leiden, Backhuys Publ., 2000. 428 p. (In Russian)
103. Alonso M. Fauna Iberica. Vol. 7: Crustacea, Branchiopoda. Madrid, Mus. Nac. Cienc. Nat. CSIC, 1996. 486 p. (In Spanish)
104. Shannon C.E., Weaver W. The Mathematical Theory of Communication. Urbana, Univ. Ill. Press, 1963. 117 p.
105. Pielou E.C. The measurement of diversity in different types of biological collections. J. Theor. Biol., 1966, vol. 13, pp. 131-144. doi: 10.1016/0022-5193(66)90013-0.
106. Pantle F., Buck H. Die biologische Ьberwachung der Gewдsser und die Darstellung der Ergebnisse. Gas- Wasserfach, 1955, Bd. 96, H. 18, S. 604-620.
107. Kolichestvennye metody ekologii i gidrobiologii: Sb. nauch. tr. posvyashch. pamyati A.I. Bakanova [Quantitative Methods of Ecology and Hydrobiology: Collection of Scientific Papers Dedicated to the Memory of A.I. Bakanova]. Rosenberg G.S. (Ed.). Tolyatti, SamNTs Ross. Akad. Nauk, 2005. 404 p. (In Russian)
108. Juggins S. C2 Version 1.5 User Guide. Software for Ecological and Palaeoecological Data Analysis and Visualization. Newcastle upon Tyne, Newcastle Univ., 2007.
109. Juggins S. C2. Software for Ecological and Palaeoecological Data Analysis and Visualization. Version 1.5 User Guide. Newcastle upon Tyne, UK: Newcastle Univ., 2007. 73 p.
110. Grimm E.C. TGView 2.0.2 (Software). Ill., USA, State Mus. Springfield, 2004.
111. Chengalath R., Bruce W.J., Scruton D.A. Rotifer and crustacean plankton communities of lakes in insular Newfoundland. Verh. Int. Ver. Limnol., vol. 22, no. 1, pp. 419-430.
112. Nevalainen L. Sexual reproduction in chydorid cladocerans (Anomopoda, Chydoridae) in southern Finland - implication for paleolimnology. Doct. Diss. Helsinki, Univ. of Helsinki, 2008. 55 p.
113. Smimov N.N. Istoricheskaya ekologiya presnovodnykh zootsenozov [Historical Ecology of Freshwater Zoocenoses]. Moscow, T-vo. Nauchn. Izd. KMK, 2010. 225 p. (In Russian)
114. Sarmaja-Korjonen, K. Headshields of ephippial Chydorus piger Sars (Cladocera, Chydoridae) females from northern Finnish Lapland: a long period of gamogenesis? Hydrobiologia, 1999, vol. 390, nos. 1-3, pp. 11-18. doi: 10.1023/A:1003507300981.
115. Sarmaja-Korjonen, K. Multi-proxy data from Kaksoislammi Lake in Finland: Dramatic changes in the late Holocene cladoceran assemblages. J. Paleolimnol., 2002, vol. 28, no. 3, pp. 287-296. doi: 10.1023/A:1021611225821.
116. Sarmaja-Korjonen K. Chydorid ephippia as indicators of past environmental changes - a new method. Hydrobiologia, 2004, vol. 526, no. 1, pp. 129-136. doi: 10.1023/B:HYDR.0000041595.08121.ab.
117. Maemets A. Eesti vesikirbuliste (Cladocera) okoloogiast ja fenoloogiast. Hьdrobioloogilised uuri- mused, 1961, vol. 2, pp. 108-158. (In Estonian)
118. Sand0y S., Nilssen J.P. A geographical survey of littoral crustacea in Norway and their use in paleolimnology. Hydrobiologia, 1986, vol. 143, no. 1, pp. 277-286. doi: 10.1007/BF00026671.
119. Frolova L. Subfossil Cladocera (Branchiopoda, Crustacea) in climatic and palaeoenvironmental investigations in Eastern Siberia (Russia). Proc. 16th Int. Multidiscip. Sci. GeoConf. SGEM 2016, 2016, book 4, vol. 2, pp. 601-606. doi: 10.5593/SGEM2016/B42/S19.077.
120. Sladecek V. System of water quality from the biological point of view. Arch. Hydrobiol. Ergeb. Limnol., 1973. Bd. 7, pp. 1-218.
121. Frolova L., Nazarova L., Pestryakova L., Herzschuh U. Subfossil Cladocera from surface sediment in thermokarst lakes in northeastern Siberia, Russia, in relation to limnological and climatic variables. J. Paleolimnol., 2014, vol. 52, no. 1, pp. 107-119. doi: 10.1007/s10933-014-9781-7.
122. Ibragimova A.G., Frolova L.A., Grekov I.M. Results of subfossil Cladocera (Branchiopoda, Crustacea) analyses from bottom deposits of Lake Antyukh-Lambina (Kola Peninsula, Murmansk region). Res. J. Pharm., Biol. Chem. Sci., 2016, vol. 7, no. 6, pp. 3201-3206.
123. Catalan J., Barbieri M.G., Bartumeus F., Bituslk P., Botev I., Brancelj A., Cogвlniceanu D., Manca M., Marchetto A., Ognjanova-Rumenova N., Pla S., Rieradevall M., Sorvari S., Stefkova E., Stuchllk E., Ventura M. Ecological thresholds in European alpine lakes. Freshwater Biol., 2009, vol. 54, no. 12, pp. 2494-2517. doi: 10.1111/j.1365-2427.2009.02286.x.
124. Bledzki L.A., Rybak. J.I. Freshwater Crustacean Zooplankton of Europe: Cladocera & Copepoda (Calanoida, Cyclopoida) Key to Species Identification, with Notes on Ecology, Distribution, Methods and Introduction to Data Analysis. Springer, 2016. 936 p.
125. Buczkф K., Korponai J., Padisak J., Starratt S.W. (Eds.) Palaeolimnological Proxies as Tools of Environmental Reconstruction in Fresh Water. Springer, 2009. 327 p.
126. Andronikova I.N. Structural and functional organization of zooplankton in lake ecosystems of different trophic levels. Extended Abstract of Doct. Biol. Sci. Diss. Leningrad, 1989. 39 p. (In Russian)
Abstract
Paleoecological and Paleoclimatic Reconstructions for the Karelian Isthmus Based on the Study of Subfossil Cladocerans from Lake Medvedevskoe (Northwest Russia)
L.A. Frolovaa, A.G. Ibragimovaa, D.A. Subetto0, L.B. Nazarovac, L.S. Syrykh daKazan Federal University, Kazan, 420008 Russia 0'Northern Water Problems Institute, Karelian Scientific Center, Russian Academy of Sciences,
Petrozavodsk, 185003 Russia cUniversity of Potsdam, Potsdam, 14469 Germany dHerzen State Pedagogical University of Russia, St. Petersburg,
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.
Keywords: paleoclimatic reconstructions, subfossil Cladocera, Lake Medvedevskoe, Karelian Isthmus
Figure Captions
Fig. 1. The physico-geographical location of Lake Medvedevskoe.
Fig. 2. The stratigraphic distribution of the main cladoceran taxa in the sediment core from Lake Medvedevskoe.