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Two types of plots characterizing the undisturbed structure of the biotopic spectrum of diatom algae are recognized. The first of them has a hyperbolic form and the second is a sigmoid curve (normal distribution). It was shown that, under adverse external impact, both types of plots change their shape and the extent of their distortion reflects the general level of anthropogenic load on this water body or its part. The proposed method of graphical comparison was developed for lakes of Kola Peninsula. Later it was successfully used in the biomonitoring of watercourses of the Volga–Akhtuba interfluve area (Astrakhan Province) and in paleoenvironmental reconstruction for Galichskoe Lake (Kostroma Province). 相似文献
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Zayonchek A. V. Brekke H. Sokolov S. Yu. Ermakov A. V. Efimov V. N. Zaraiskaya Yu. A. Akhmedzyanov V. R. Kalinin N. D. Kokhan A. V. Moroz E. A. Ol’shanetskii D. M. Razumovskii A. A. Yampol’skii K. P. 《Doklady Earth Sciences》2010,430(2):265-270
Doklady Earth Sciences - 相似文献
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L. V. Razumovskii 《Water Resources》2008,35(5):570-582
Diatomic complexes from bottom sediments of Lake Galichskoe (Kostroma Province) were analyzed. Samples of most recent sediments that formed during the past decades were studied. For the first time a large lake was studied by using a single reconstruction method based on the three major hydrological characteristics: the temperature, cation-anion balance, and nutrient concentration. The taxonomic composition of diatomic complexes was identified by the above-mentioned hydrological-environment parameters with account of the bioindication significance. A method developed by the author was used for graphic correlation of the structure of diatomic complexes. Cyclic variations were identified in the temperature regime of the lake in recent decades. The duration of cycles appears to be comparable with the 11-year cycle of solar activity. Correlation was found to exist in the dynamics of variations in all parameters involved in the analysis. Confirmation is given to the preliminary suggestions regarding the high rate of sedimentation at the last phase of the lake structure passing into the category of bog ecosystems. 相似文献
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A. V. Zayonchek A. O. Mazarovich V. Yu. Lavrushin S. Yu. Sokolov M. D. Khutorskoi A. S. Abramova R. Kh. Aliulov V. R. Akhmedzyanov Yu. A. Zaraiskaya A. V. Ermakov V. N. Efimov E. A. Moroz A. A. Peive D. A. Prokhorov E. P. Radionova Yu. N. Raznitsyn A. A. Razumovskii A. A. Chernykh K. P. Yampol’skii 《Doklady Earth Sciences》2009,427(1):740-745
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L. V. Razumovskii 《Water Resources》2008,35(1):97-107
Diatom community from Upper Holocene sediments of Lake Boroe (the Valdai Hills) was analyzed with the aim to test a new methodological strategy for obtaining additional data on the development history of lakes. The species composition of diatom complexes was examined with allowance made for the indication significance of each taxon. Variations in the numerical values of the parameters of the aquatic environment are reconstructed, including temperature, saprobity index, pH. The calculation and reconstruction of those parameters were carried out by using a unified procedure for the optimization of their comparison. 相似文献
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Nikiforov S. L. Ananiev R. A. Dmitrevsky N. N. Libina N. V. Sorokhtin N. O. Sukhikh E. A. Razumovskii A. A. Toropov G. A. 《Oceanology》2021,61(4):511-516
Oceanology - Sedimentary waves are represented by a series of wavelike accumulative features with various degrees of morphological expression. These morphological forms are superimposed on the... 相似文献
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Skolotnev S. G. Sanfilippo A. Peyve A. A. Nestola Y. Sokolov S. Yu. Petracchini L. Dobrolybova K. O. Basch V. Pertsev A. N. Ferrando C. Ivanenko A. N. Sani C. Razumovskii A. A. Muccini F. Bich A. S. Palmiotto C. Brusilovsky Y. V. Bonatti E. Sholukhov K. N. Cuffaro M. Veklich I. A. Ligi M. Dobrolybov V. N. 《Doklady Earth Sciences》2021,497(1):191-194
Doklady Earth Sciences - The geological and geophysical data obtained during the 50th cruise of R/V Akademik Nikolaj Strakhov on the Charlie Gibbs megatransform system structure... 相似文献
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T. I. Moiseenko L. V. Razumovskii N. A. Gashkina A. V. Shevchenko V. L. Razumovskii A. S. Mashukov V. Yu. Khoroshavin 《Water Resources》2012,39(5):576-589
The results of studying four mountain lakes in different climatic zones (in regions of the Kola North and the Western Caucasus) are given. Original methods of paleoecological reconstruction developed by the authors have been used to characterize the main trends and rates in environmental changes at historical scale (by geochemical composition and diatom complexes in bottom sediment layers). Similar processes of modern water enrichment by metals (especially, Cd and Pb) have been determined in the examined lakes. Trends in changes in acid-base balance in The Kola North lakes since the late XIX century have been identified, reflecting the effect of transboundary transport of acid-forming substances from industrial Europe. Studies of diatom complexes in Caucasian lakes showed a rise in the mean annual temperature of lake water during the XX century supposedly by 1.5°C. 相似文献