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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zykov V.V., Rogozin D.Y., Kalugin I.A., Dar'in A.V., Degermendzhi A.G.
Заглавие : Carotenoids in bottom sediments of lake Shira as a paleoindicator for reconstruction of Lake States in Khakassiya, Russia
Место публикации : Contemporary Problems of Ecology. - 2012. - Vol. 5, Is. 4. - С. 434-442. - ISSN 19954255 (ISSN) , DOI 10.1134/S199542551204018X
Ключевые слова (''Своб.индексиров.''): anaerobiosis--bottom sediments--holomixis--meromixis--okenone--bacterium--bioindicator--biomarker--carotenoid--holocene--lacustrine deposit--meromixis--molecular analysis--paleoclimate--photoautotrophy--reconstruction--khakassia--lake shira--russian federation
Аннотация: The concentrations of carotenoids buried in the bottom sediments of Lake Shira (Siberia, Khakassiya) have analyzed for the period of the last 2300 years. The bottom sediments were found to contain carotenoids, which are molecular markers of the corresponding groups of Phototrophic organisms. The bottom sediments of Lake Shira were shown to be a promising object for climate reconstructions of the Late Holocene in southern Siberia. В© 2012 Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rogozin D. Y., Tarnovsky M. O., Belolipetskii V. M., Zykov V. V., Zadereev E. S., Tolomeev A. P., Drobotov A. V., Barkhatov Y. V., Gaevsky N. A., Gorbaneva T. B., Kolmakova A. A., Degermendzhi A. G.
Заглавие : Disturbance of meromixis in saline Lake Shira (Siberia, Russia): Possible reasons and ecosystem response
Колич.характеристики :12 с
Коллективы : Russian Foundation for Basic Research [16-05-00091]; Russian Federation [NSh-9249.2016.5]
Место публикации : Limnologica: ELSEVIER GMBH, URBAN & FISCHER VERLAG, 2017. - Vol. 66. - С. 12-23. - ISSN 0075-9511, DOI 10.1016/j.limno.2017.06.004. - ISSN 1873-5851(eISSN)
Примечания : Cited References:43. - We acknowledge the financial support by the Russian Foundation for Basic Research, grant No 16-05-00091. The research was partially supported by the Council on grants from the President of the Russian Federation for support of leading scientific schools (grant NSh-9249.2016.5). Many thanks to colleagues from analytical laboratory of Institute of Biophysics SB RAS for sulphide determination. We thank the employees of Middle Siberian Department of Russian Hydro Meteorological Service in Krasnoyarsk for providing the data on weather and Lake Shira level. We are grateful to Dr. Martin Schmid and two anonymous reviewers for valuable comments which helped us to improve the article considerably.
Предметные рубрики: SHUNET SOUTH SIBERIA
MEROMICTIC LAKE
VERTICAL STRATIFICATION
WINTER
Ключевые слова (''Своб.индексиров.''): meromixis--mixolimnion--stratification--stability--mixing--food chain--purple sulfur bacteria
Аннотация: Saline Lake Shira (Southern Siberia, Russia) was meromictic through the observation period 2002-2015. During the under-ice periods of 2015 and 2016, complete mixing of the water column was recorded for the first time, and hydrogen sulphide temporarily disappeared from the water column of the lake; i.e. in those years the lake turned to holomixis. In the summer of 2015, a sharp increase in chlorophyll a, organic carbon, zooplankton, and phytoflagellates was observed in the lake, which was probably due to the release of nutrients from the monimolimnion. Purple sulfur bacteria completely disappeared from the lake after the first mixing in 2015, and did not reappear despite the restoration of meromixis in 2017. Thus, it was demonstrated that purple sulfur bacteria are sensitive to the weakening of the stratification of Lake Shira. Based on the data of the seasonal monitoring of temperature and salinity profiles over the period 2002-2017, it was presumed that the main cause of deep mixing in 2015 was the weakening of the salinity gradient due to strong wind impact and early ice retreat in the spring of 2014. In addition, it was shown that in previous years a significant contribution to the maintenance of meromixis was made by an additional influx of fresh water, which caused a rise in the lake level in the period 2002-2007. Thus, we identified a relationship between the stratification regime of the lake and the change in its level, which provides valuable information both for the forecast of Water quality and for reconstruction of the Holocene climate humidity in this region of Southern Siberia from the sediment cores of Lake Shira.
WOS,
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