Mikhail Makarov

• Doctor of biological Sciences
• Research Director at Murmansk Marine Biological Institute

The authors have conducted laboratory experiments to study the ability of the Barents Sea brown alga Fucus vesiculosus L. to adsorb technogenic radionuclides from seawater of various salinity (8, 18 and 35 psu). They have obtained new data on the role of macroalgae communities in the geodynamics of radionuclides in the coastal zone of the seas. Fuc...

Influence of main environmental factors (temperature, intensity of photosynthetically active radiation and tidal cycle) on the contents of free amino acids (FAAs) in Fucus vesiculosus in the Barents Sea during the day was investigated. An undular change in the content of FAAs occurs during the day, associated with the phases of the tidal cycle. Tem...

Четвертого августа 2022 г. трагически погиб во время отбора проб водорослей в Баренцевом море замечательный человек, высококвалифициро- ванный водолаз-аквалангист и коллектор биоло- гического материала Дмитрий Васильевич Тома- новский

Arctic ecosystems are the most sensitive and vulnerable to anthropogenic impact, namely, the influence of petroleum products. The aim is to identify the effect of diesel fuel (DF) on the composition of free amino acids (FAA) in Acrosiphonia arcta in Barents Sea. The impact of DF concentrations of 20 - 3000 maximal permitted concentration (MPC) was...

The physiological and biochemical state of brown alga Fucus vesiculosus from the Barents Sea was studied while maintained in low salinity seawater (10 and 20 PSU) during a 14-day experiment. At both salinity levels, a decrease in respiratory rate and catalase activity and a significant increase in free amino acids content compared to control condit...

During the tidal cycle, Fucus vesiculosus L. lost moisture (up to 30% of wet weight) and was characterized by a sinusoidal pattern in photosynthetic activity. Three peaks in the photosynthesis capacity were observed at the beginning and middle of low tide and at the beginning of high tide. There were no structural changes in the photosynthetic appa...

Article present the main results of the investigations deal withthe program of the Presidium Russian Academy of Science “Bioresourcesof the Arctic seas of Russia: current state, the effectof natural changes and anthropogenic impacts, scientific foundations and perspectives for use”and linked researches.

The viability and physiological state of brown macroalgae Fucus vesiculosus and its associated epiphytic bacteria exposed to diesel water-accommodated fraction (WAF), as well as the capacity of this association to deplete petroleum hydrocarbons (HCs) were experimentally tested. After a 6-day exposure treatment, the algal-surface associated bacteria...

There are shown the results of the researche of the probable role of marine algae-macrophytes in cleaning the coastal waters from oil products. The results of researches demonstrate a high ability of sorption of algae Fucus vesiculosus and Ulvaria obscura to oil products: decreasing the containment of oil products in water, in parallel its accumula...

A comparative study of the photosynthetic rate, catalase activity, photosynthetic pigments content and water content in thalli of Fucus vesiculosus L. and Fucus serratus L., during a tidal cycle, was carried out. The aforementioned species grow in various horizons of the Barents Sea littoral, so, during the study period, at low tide, bladder wrack...

The increase in anthropogenic pressure on ecosystems necessitated the implementation of measures aimed at purifying the environment and restoring disturbed biocoenoses. To remediate the marine environment from heavy metals, radionuclides, oil products, it has been proposed to use plantations-biofilters, the biological components of which are seawee...

The scheme of sanitary algae plantation was depicted and successfully aprobated in the Barents and the White seas. The plantation is based on symbiotic association of brown algae: Fucus vesiculosus, Saccharina latissima and hydrocarbon oxydizing bacteria. The analysis of speed of growth and other physiological features of plantation. Biochemical an...

Findings of Ulva lactuca L. on the Murman Сoast of the Barents Sea are described for the period 2009–2017. This species has not been found in this area for more than 50 years. The occurrence of U. lactuca on the Murman Coast appears to be related to the recent warming of waters in the region.

The physiological parameters (growth rate, specific area, photosynthesis rate, metabolic activity of cells, contents of photosynthetic pigments, dry matter, and soluble phlorotannins) of the intertidal brown seaweeds Fucus serratus and F. distichus cultivated in the Barents Sea for oil biofiltration purposes were investigated. The possibility of th...

Investigation of species composition of epiphytes and phytophages, thalus morphology, growth rate, intensity of photosynthesis, composition and ratio of photosynthetic pigments, metabolic activity of cells of brown seaweed Fucus vesiculosus, placed on depths from 0 to 15 m, was carried out. Results of the study have shown that in the absence of int...

Investigation of the size and structure (the ratio between light-harvesting pigments: chlorophyll (Chl) a, Chl с, and fucoxanthin) of the light-harvesting complex (xanthosome) of the Barents Sea brown seaweed Fucus vesiculosus L. has been carried out. It has been shown that adaptation to light intensity, which varies throughout the year, occurs by...

An experimental study was undertaken to reveal the influence of the hydrostatic pressure on the early developmental stages of Laminaria saccharina, including the motile zoospores, the embryospores, and sprouting spores. The pressure did not affect the moving patterns and sinking rate of the zoospores. The sprouting spores were the most vulnerable a...

According to modern ideas, vertical zonation of alga growth is determined by a complex of factors. The upper boundary is determined by the abiotic factors (illumination, temperature, drying, and amount of nutrients); the lower boundary, by the biotic factors (interspecific competition) [1]. A great number of studies are devoted to assessment of the...

Without Abstract

The effect of a prolonged absence of light on the photosynthetic pigment content and cell ultrastructure in Fucus vesiculosus L. and F. serratus L. from the Barents Sea was investigated during a 30-day experiment in summer and under natural conditions in winter (at the end of the polar night). With decreasing irradiance, the accumulation of photosy...

During 43 days of natural and laboratory experiments, it was demonstrated that changes in pigment concentrations occur during polar night in Ascophyllum nodosum (L.) Le Jol, Fucus vesiculosus L., and F. serratus L. from the Barents Sea. An insignificant increase in the amount chlorophyll and fucoxanthin was noted in the species inhabiting the upper...

Thallomes F. vesiculosus L. and F. serratus L. were placed in containers with different light permeability (<5% and >65%) submerged in the sea at a depth of 1 m from the surface. The changes of concentrations and ratios for algae photosynthetic pigments were compared with the similar data for plants in native conditions in summer (polar day) and wi...

The ability of marine macrophytes to survive in Arctic regions with extreme environmental conditions (long-term exposure to negative temperature, changes in illuminance ranging from polar night to polar day, etc.) has always been a subject of considerable interest of researchers. It was found recently that photoperiod played a decisive role in chan...

The sporogenic tissue, motile zoospores and non-motile embryospores of Laminaria saccharina were exposed to the different levels of the ultraviolet-B radiation (UV-B) (0.1-1.2 W m-2) over 12-24 h. At an irradiance of 1.2 W m-2 spore release began after 4 h exposure of the sporogenic tissue to UV-B. There were also many non-motile spores and the fra...

Nine species of macroalgae collected on the East Murman coast of the Barents Sea were examined: Laminaria saccharina, Alaria esculenta, Saccorhiza dermatodea, Fucus distichus, Fucus serratus, Fucus vesiculosus (Phaeophyta), Palmaria palmata, Porphyra umbilicalis (Rhodophyta) and Ulvaria obscura (Chlorophyta). The samples were kept in three culturin...

Measurements of changes in the area of the thallus were carried out for 15 widespread macroalgae from the Barents Sea. The experiments lasted 10 to 14 days and the area was estimated with an image analysis system. The experiments were conducted under both in-situ conditions in the sea and controlled laboratory conditions (10 °C, 5-10 W m-2, light-d...

The qualitative and quantitative composition of the kelp communities and the age and size structure of populations of Laminaria digitata, L. saccharina, and Alaria esculenta have been studied in southeastern Franz Joseph Land. The community is characterized by poor species composition, low population density, and small biomass of the algae. The kel...

The species composition and biomass of kelp community as well as the age and size structure of Laminaria digitata, L. saccharina, Alaria esculenta in the southeastern part of the Franz Josef Land were studied. Small number of species, low densities and biomasses of laminarians occurred in this high arctic region. Long-lived plants were common in th...