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Natalya Timofeeva

Natalya Timofeeva
Institute for Biology of Inland Waters, Russian Academy of Sciences · laboratory of algology

PhD (Biol.)

About

30
Publications
781
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55
Citations
Citations since 2016
21 Research Items
46 Citations
20162017201820192020202120220246810
20162017201820192020202120220246810
20162017201820192020202120220246810
20162017201820192020202120220246810

Publications

Publications (30)
Article
Full-text available
The first data on the content of plant pigments is presented for the cores of bottom sediments sampled in large shallow lakes Vozhe and Lacha located in the upper reaches of the Onega River. In the 1-m core of olive silts, the total concentration of chlorophyll a and pheopigments varied within 35–236 (94.2 ± 3.3) in Lake Vozhe and 58–118 (83.8 ± 1....
Article
This article presents new data of spectrophotometric determination of pigment concentrations in phytoplankton, epiphyton and bottom sediments of the shallow highly productive Lake Nero based on survey materials in summer 2017. The average concentrations of chlorophyll a were 73.5±6.1 μg/L in phytoplankton and 40.7±21.4 mg/m2 of substrate in epiphyt...
Article
Full-text available
This study analyzes the data of spectrophotometric determination of plant pigments in the bottom sediments of Lake Nero based on bottom survey data of 2017. A low variability (Cv = 27–31%) in concentrations of chlorophyll a and phaeopigments over the bottom area and vertically in the sapropel cores is established. The values of pigment concentratio...
Article
Full-text available
The physicochemical characteristics of bottom sediments in inland water bodies in the Central and Southern Vietnam are presented for the first time, including particle-size distribution, organic matter content, bulk density, and natural moisture content. The main types of sediments in rivers, lakes, reservoirs, abandoned quarries, and ponds were de...
Article
Full-text available
The spatial, seasonal, and interannual variability of content of sedimentary pigments and biomass of macrozoobenthos in the Rybinsk Reservoir (Russia) are analyzed on the basis of studies performed in 2009-2015. Specific features of the macrozoobenthos distribution depending on the characteristics of biotopes , including the content of sedimentary...
Article
Full-text available
Data on the content of plant pigments in the bottom sediments (BSs) of the water bodies of Central and South Vietnam are given for the first time. The average concentration of chlorophyll a and phaeopig-ments (Chl + Ph) in total reaches up to 3.9 μg/g dry matter in rivers, 5.6 in ponds, 13.8 in sand quarries, 56.8 in reservoirs, and 245 in lakes. M...
Article
The effect of nickel chloride concentrations in the range of 1–1000 mg/L on seed germination and the development of organs and pigment system in seedlings of the helophyte common water-plantain Alisma plantago-aquatica L. and hygrohelophyte greater water-parsnip Sium latifolium L. has been studied. It is shown that nickel chloride has practically n...
Article
The effect of copper and nickel ions at concentrations of 1, 10, 25, 50, and 100 mg/L on morphometric and pigment indicators of the seedlings of narrowleaf water-plantain Alisma gramineum and seashore dock Rumex maritimus was studied. It was found that the pigment characteristics were more sensitive to nickel and copper than the morphometric charac...
Chapter
The aim of research was to estimate the role of phytoplankton as a major contributor to primary production in formation of productivity of benthic biotopes in a large man- made water body (the Rybinsk Reservoir on the Volga River, Russia). The main approach was a comparison of phytoplankton primary production and chlorophyll concentrations in water...
Article
The results of studies of the vertical distribution of SP (the sum of chlorophill a and pheopigments) and the rate of silting of the Rybinsk Reservoir since its filling in 1941 up to 2009 are studied. The range of pigment concentrations (7–232 μg/g of dry residue) in core sample layers includes the values typical of all types of trophic conditions...
Article
Research was made to substantiate the use of sedimentary pigmentsfor monitoring of a trophic state of a large reservoir characterizedextremely mosaic structure of bottom sediments and rare stratification.Spectrophotometric method was used to measure the concentrations ofsedimentary pigments (chlorophyll a, pheopigments, total carotenoids) inthe sur...
Article
Results of spectrophotometric determination of plant pigments (chlorophylls, phaeo-pigments, and carotenoids) in the upper 3-cm layer of the littoral and sublittoral lake bottom sediments are presented for the depths corresponding to water transparency of 0.2, 0.5; 1, 2, and 3. Pigment characteristics are analyzed for the conditions, theoretically...
Article
Samples characterizing the horizontal distribution of bottom deposits of different types in the Upper Volga reservoirs were used to study the statistical relationship between the indicators of the potential and actual trophy of water bodies. These indicators are the amount of biogenic elements (the total nitrogen and phosphorus) and phyto-pigments...
Article
The trophic state of the Ivankovo Reservoir is evaluated based on the characteristics of phytoplankton development and silt accumulation. Data on the space and time distribution of plant pigments in silt deposits are examined. Correlation between plant pigments and the main characteristics of silts are established. The ratio of chlorophyll content...
Article
Data on the distribution of vegetable pigments in bottom deposits and water mass is presented to characterize the ecological zones of the reservoir. The concentrations of pigments in the channel deposits are shown to increase from the reservoir head toward the dam in accordance with the difference in phytoplankton production in the zone of backwate...
Article
25.08.09 г. Сравнительный анализ содержания растительных пигментов в донных отложениях Горьков-ского и Чебоксарского водохранилищ. – Сигарева Л.Е., Тимофеева Н.А., Законнов В.В. – Изучено распределение растительных пигментов и типологические характеристики донных отложений по про-дольному профилю и поперечным разрезам крупных последовательно распол...

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