ABSTRACT Siliceous stomatocysts of chrysophyte algae, along with diatom frustules, are well preserved in bottom sediments of various water bodies. Analysis of microfossils from a core sample of the Upper Pleistocene and Holocene sediments from the southern part of Lake Hovsgol revealed 36 different morphotypes of chrysophycean stomatocysts. Some of them were attributed to species of the genera Mallomonas Perty, Chrysosphaerella Lauterborn., Paraphysomonas (Stokes) De Saedeleer, and Dinobryon Ehr.; 20 morphotypes were described as novel. The abundance and diversity of stomatocyst morphotypes in the core sample varied depending on the age of sediments. The results obtained in the study broaden views on the biological diversity of microalgae and confirm that chrysophycean stomatocysts can serve as good environmental indicators in paleolimnological and paleoclimatic reconstructions.
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A. Firsova, S. Vorobyova and Y. Likhoshway, "Chrysophycean Stomatocysts in the Upper Pleistocene and Holocene Sediments from Lake Hovsgol, Northern Mongolia," International Journal of Geosciences, Vol. 3 No. 4, 2012, pp. 664-674. doi: 10.4236/ijg.2012.34067.
 A. P. Fedotov, E. V. Bezrukova, S. S. Vorobyova, O. M. Khlystov, O. V. Levina, I. B. Mizandrontsev, G. F. Mazepova, A. R. Semenov, T. O. Zheleznyakova, S. M. Krapivina, E. P. Chebykin and M. A. Grachev, “Bottom Sediments of Lake Hovsgol as Annals of Holocene and Late Pleistocene Paleoclimates,” Geologia i Geofizika, Vol. 42, No. 1-2, 2001, pp. 384-390.
 A. P. Fedotov, E. P. Chebykin, M. Yu. Semenov, S. S. Vorobyova, E. Yu. Osipov, L. P. Golobokova, T. V. Pogodaeva, Т. О. Zheleznyakova, M. A. Grachev, D. Tomurhuu, Ts. Oyunchimeg, Ts. Narantsetseg, O. Tomurtogoo, P. T. Dolgikh, M. I. Arsenyuk and M. De Batist “Changes in the Volume and Salinity of Lake Khubsugul (Mongolia) in Response to Global Climate Changes in the Upper Pleistocene and the Holocene,” Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 209, No. 1-4, 2004, pp. 245-257. doi:10.1016/j.pa
 A. Yu. Kazansky, A. P. Fedotov, G. G. Matasova, A. A. Yuldashev, G. A. Ziborova, T. O. Zheleznyakova, E. G. Vologina, T. S. Oyuunchimeg, Ts. Narantsetseg and D. Tomurkhu, “Initial Results of Paleomagnetic Studies on Bottom Sediments of Lake Hovsgol: Drilling Data,” Geologia i Geofizika, Vol. 46, No. 4, 2005, pp. 448-451.
 A. A. Prokopenko, G. K. Khursevich, E. V. Bezrukova, M. I. Kuzmin, X. Boes, D. F. Williams, S. V. Fedenya, N. V. Kulagina, P. P. Letunova and A. A. Abzaeva, “Paleoenvironmental Proxy Records from Lake Hovsgol, Mongolia, and a Synthesis of Holocene Climate Change in the Lake Baikal Watershed,” Quaternary Research, Vol. 68, No. 1, 2007, pp. 2-17.
 A. A. Abzaeva, E. V. Bezrukova, V. A. Bychinskii, et al., “Structure of Lake Hovsgol Bottom Sediments: Relationships with Geological and Climatic Factors,” Geologia i Geofizika, Vol. 48, No. 11, 2007, pp. 1117-1143.
 A. A. Prokopenko, G. K. Khursevich, M. I. Kuzmin and T. Kawai, “Productivity Cycles in Lake Hovsgol, NW Mongolia, during the Last 1 Ma and the Age Model of the HDP-04 Drill Core Record,” Quaternary International, Vol. 205, 2009, pp. 111-125.
 G. K. Khursevich and A. A. Prokopenko, “Diatom Record from Lake Hovsgol, Mongolia, during the Last 1 Ma: The Results from the HDP-04 Drill Core,” Quaternary International, Vol. 205, 2009, pp. 84-97.
 N. I. Dorofeyuk and P. E. Tarasov, “Vegetation and Water Levels in Lakes of Northern Mongolia over the Past 12,500 Years According to Data of Palynological and Diatom Analyses,” Stratigraphy and Geological Correlation, Vol. 6, No. 1, 1998, pp. 73-87.
 S. S. Vorobyova, “Diatom Complexes of Lake Hovsgol,” Abstracts of the International Symposium “The Living Diatom Cell” 100 Years A.P. Skabichevsky Memorial, Irkutsk, 17-22 September 2004, pp. 106-107.
 I. V. Makarova, Ed., “Diatomovye Vodorosli SSSR. Isko- paemye i Sovremennye,” Nauka, Sankt-Peterburg otdelenie, Sankt-Peterburg, T. 2, No. 2, 1992.
 M. A. Grachev, Ye. V. Likhoshway, S. S. Vorobyova, O. M. Khlystov, E. V. Bezrukova, E. V. Veinberg, E. L. Goldberg, L. Z. Granina, E. G. Kornakova, F .Lazo, O. V. Levina, P. P. Letunova, P. V. Otinov, V. V. Pirog, A. P. Fedotov, S. A. Yaskevich, V. A. Bobrov, F. V. Sukhorukov, V. I. Rezchikov, M. A. Fedorin, K. V. Zolotarev and V. A. Kravchinskii, “Signals from the Upper Pleistocene Paleoclimates in Lake Baikal Sediments,” Geologia i Geofizika, Vol. 38, No. 5, 1997, pp. 957-980.
 G. Cronberg, “Chrysophycean Cysts and Scales in Lake Sediments: A Review,” In: J. Kristiansen and R. A. Andersen, Eds., Chrysophytes: Aspects and Problems, Cambridge University Press, Cambridge, 1986, pp. 281-315.
 K. E. Duff, B. A. Zeeb and J. P. Smol, “Atlas of Chrysophycean Stomatocysts,” Kluwer Academic Publishers, Dordrecht, 1995.
 A. N. Wilkinson, B. A. Zeeb and J. P. Smol, “Atlas of Chrysophycean Cysts,” Kluwer Academic Publishers, Dordrecht, 2001.
 A. D. Firsova and Ye. V. Likhoshway, “Atlas of Chrysophycean Cysts from Lake Baikal,” Nauka, Novosibirsk, 2006.
 J. P. Smol, “The Ratio of Diatom Frustules to Chrysophycean Statospores: A Useful Paleolimnological Index,” Hydrobiologia, Vol. 123, 1985, pp. 199-204.
 R. N. Belyakova, L. N. Voloshko, O. V. Gavrilova, R. M. Gogorev, I. V. Makarova, Yu. B. Okolodkov and L. A. Rundina, “Algae Responsible for Algal Bloom in Water Bodies of Northwestern Russia,” KMK Scientific Press, Moscow, 2006.
 G. Cronberg, “Сyst Development in Different Species of Mallomonas (Chrysophyseae) Studied by Scanning Electron Microscopy,” Archiv für Hydrobiologie, Vol. 56, 1980, pp. 421-434.
 T. S. Narantsetseg, “Geochemistry of Lake Hovsgol Bottom Sediments and Paleoclimatic Reconstructions,” Extended Abstract of Cand. Sci. (Geol.), Dissertation, Irkutsk, 2007.
 A. D. Firsova, A. E. Kuzmina, I. V. Tomberg, T. G. Potemkina and Ye. V. Likhoshway, “Seasonal Dynamics of Chrysophyte Stomatocyst Formation in the Plankton of Southern Baikal,” Izvestiya Akademii Nauk SSSR Seriya Biologicheskaya, Vol. 5, 2008, pp. 589-596.
 H. J. Carney and C. D. Sandgren, “Chrysophycean Cysts: Indicators of Eutrophication in Recent Sediments of Frains Lake, Michigan, USA,” Hydrobiologia, Vol. 101, 1983, pp. 195-202. doi:10.1007/BF00009875
 E. Magyari, K. Buczko, G. Jakab, M. Braun, Z. Pal, D. Karatson and I. Pap, “Palaeolimnology of the Last Crater Lake in the Eastern Carpathian Mountains: A Multiproxy Study of Holocene Hydrological Changes,” Hydrobiologia, Vol. 631, No. 1, 2009, pp. 29-63.