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May 2006 - present
Publications
Publications (59)
The current state and changes in biological communities of the Russian part of the South-Eastern Baltic Sea during two first decades of twenty-first century is considered. In phytoplankton, some typical cold-water dominants have been lost from the spring complex of species and the productivity of summer phytoplankton has been 4–7 times higher in so...
The long-term study of aquatic communities and hydrochemical parameters of the coastal zone of the western part of the Curonian Lagoon was continued. Depending on season, typical species of diatoms, greens and charophytes and potentially toxic cyanobacteria dominated in phytoplankton. Based on the average seasonal biomass, the coastal zone was char...
The long-term study of aquatic communities and hydrochemical parameters of the coastal zone of the western part of the Curonian Lagoon was continued. Depending on season, typical species of diatoms, greens and charophytes and potentially toxic cyanobacteria dominated in phytoplankton. Based on the average seasonal biomass, the coastal zone was char...
The article describes the state of phyto- and zooplankton, macrophytes and macrozoobenthos in the coastal zone of the Cu- ronian Lagoon during the vegetation period of 2022. Cyanobacte- ria and diatoms dominated in phytoplankton. Average seasonal biomass of phytoplankton corresponded with hypertrophic condi- tions. A sharp change in the composition...
Аннотация. В работе исследуется изменчивость гидрометеорологических характеристик и
компонентов экосистемы восточной части Финского залива в условиях климатических изменений
и антропогенной нагрузки. Выявлены положительные тренды изменчивости температуры воздуха
в регионе за период 1991―2020 гг. Наряду с этим по данным наблюдений 1978―2016 гг. отме...
![The workflow of the developed algorithm, which uses algorithms [26,30].](publication/373692729/figure/fig3/AS:11431281417867417@1746135925556/The-workflow-of-the-developed-algorithm-which-uses-algorithms-26-30_Q320.jpg)
Summer blooms of potentially harmful cyanobacteria are common in the Baltic Sea. Under clear sky conditions, the cyanobacterial blooms are easily detectable from space. We propose a new regional algorithm for cyanobacteria biomass estimation from satellite data in the eastern part of the Gulf of Finland, developed on the basis of field measurements...
In 2021, potentially toxic cyanobacteria Planktothrix agardhii (all dates) and species of the genus Microcystis (July) as well as diatoms Diatoma tenuis, Nitzschia cf. vitrea (April), Actinocyclus normanii (September) dominated in the phytoplankton of the western coastal water area of the Curonian Lagoon; According to the production indicators of p...
The structural parameters of plankton, benthos and macrophytes after large-scale technogenic transformation of the mouth area of the river were studied. Pregolya. A decrease in the species richness and area of growth of macrophytes, a simplification of the structure of communities was noted. The renewal of plant communities in the places of their o...
Samples were collected in the area of the St. Anna Trough in the northern Kara Sea in September 2015 and July-August 2016. Based on salinity and temperature distribution, four areas have been distinguished: the shelf adjacent to the St. Anna Trough, the shelf edge, and the upper and lower parts of the continental slope. The variability of the struc...
Preliminary data on the state of biological communities after the technogenic transformation of the Pregolya riverbed in Kaliningrad are presented. In the summer 2019, significant changes in the species composition and structure of macrophyte communities were revealed: reed communities and several organic pollution-sensitive species disappeared; th...
Приведены результаты мониторинга состояния биоценозов литорали западного побережья Куршского залива в весенне-летний период 2018 г. По показателям фитопланктона (биомасса>10 г/м3) прибрежная зона имела гиперэвтрофный статус, доминировали цианобактерия Planktothrix agardhii (май) и диатомовая Actinocyclus normanii (май, июль). Микроцистины обнаружен...
Four major categories of food items were determined in the gut content of chironomid larvae collected in the Curonian and Vistula Lagoons in the spring–summer period of 2009–2011. These were detritus (range from 88 to 92% of the gut content, by volume), matter of plant (2–7%) and animal origin (0.2–0.5%), and mineral particles (3–7%). Plant matter...
Were found peculiarities of the structure and distribution in the autumn plankton of the South -Eastern part of the Baltic sea (SEB) in October 2015 taking into account hydrological and hydrochemical data. There were no changes registered as to the taxonomic composition of phyto- and zooplankton, including no increase in the number of the stenother...
New data on morphology of eleven pennate diatoms from four orders (Thalassiophysales,
Rhopalodiales, Bacillariales, Surirellales) found in the subpolar meromictic Lake Mogilnoye with the level of salinity up to 4 ‰ and the water temperature at about 10 °С are presented. Halamphora cf. dubiosa and Nitzschia soratensis are recorded for the first time...
Specific features of the structure and distribution of autumn zooplankton in the southeastern Baltic Sea (SEB) in October 2015 have been found taking into account the hydrological and hydrochemical data. No changes have been detected in the taxonomic composition of phyto- and zooplankton, including the increase in the number of stenothermic and ste...
The diatom flora of the relict meromictic Lake Mogilnoye over the past 100 years has been analyzed. An inventory and taxonomic revision of diatom composition were carried out.
Биологические сообщества реки Преголя (бассейн Вислинского залива, Балтийское море). – Е.Е. Ежова, ред. –Калининград: изд-во «Смартбукс», 2013 – 246 с.: ил.
В коллективной монографии обобщены данные гидробиологических исследований АО ИО РАН 1995–2013 гг. в реке Преголе, водосбор которой охватывает почти всю Калининградскую область, а речной сток я...
![HELCOM EUTROPHICATION TARGET VALUES FOR THE GULF OF FINLAND [5, 7]](profile/Alexandra-Ershova-2/publication/330941537/figure/tbl1/AS:969840621780992@1608239431566/HELCOM-EUTROPHICATION-TARGET-VALUES-FOR-THE-GULF-OF-FINLAND-5-7_Q320.jpg)
The environmental status of the Gulf of Finland water environment was analyzed on the basis of data of Russian State Hydrometeorological University complemented by data of international monitoring. Also, the chlorophyll a data from satellite observations were used. Observed values of eutrophication indicators (such as concentrations of winter nutri...
Polychaete Marenzelleria neglecta feed as deposit-feeder in the Vistula Lagoon condition. Hediste diversicolor prefers to consume silt at experimental conditions, feed mostly on macrophytes in biotope with aquatic vegetation and filtered microalgae from near-bottom water layer in other condition. Our data confirm а high level of feeding plasticity...
Seasonal changes of the phytoplankton structural and quantitative indices of the Neman River in the territory of the Kaliningrad Region of the Russia in the area of the expected impact of the Baltic NPP during the period of multipurpose environmental monitoring in May-October 2014-2017 were analyzed for the first times. Phytoplankton was represente...
New data on morphology and taxonomy of 16 pennate diatom species of three orders Naviculales, Lyrellales and Thalassiophysales found in subpolar meromictic Lake Mogilnoye at salinity of up to 4 ‰ and water temperature of about 10 °С are presented. A new species, Navicula sepulchralis Gogorev et E. Lange, sp. nov., is described. Its valves are 38–46...
The article presents the results of shipboard and satellite measurements in the surface layer of the Baltic, Norwegian, and Barents seas during legs from the Baltic to the White Sea in June–August 2014–2016. Special attention is paid to marine phytoplankton blooms of cyanobacteria in the Baltic Sea and coccolithophores in the Barents Sea. No blooms...
Studies have been performed on a transect along 130°30′ E from the Lena River delta (71°60′ N) to the continental slope and adjacent deepwater area (78°22′ N) of the Laptev Sea in September 2015. The structure of phytoplankton communities has distinct latitudinal zoning. The southern part of the shelf (southward of 73°10′ N), the most desalinated b...
The analysis of composition, seasonal and interannual dynamics, and productivity of phytoplankton, zooplankton, and zoobenthos as well as detailed characteristic of aquatic flora of the Pregolya River are given. It is shown that the biota of anthropogenically transformed lower reach recovered partially during the 2000s.
In this section, we describe the past changes in the trophic status of the GOF using the nutrient regime. We used the GOF2014 dataset, covering the years 1996–2013, supplemented by the 2014–2015 trilateral data. Our conclusions are based on the DIN and DIP data collected in the upper 10 m in the wintertime (December–March). For the Russian waters o...
Here, we present the past changes in the eutrophication of the GOF regarding
summertime (June–September) Chl a and phytoplankton surface accumulations. Variations in these factors accompany the changes in nutrient concentrations and their ratios; the remineralized nutrient pool affects the summertime Chl a, and the excess P pool affects the extent...
В восточной части Финского залива из года в год происходят цветения сине-зеленых водорослей (цианобактерий), которые в безоблачную погоду хорошо видны со спутников. Однако проблема количественной оценки наблюдаемых цветений еще требует своего решения. В нашей работе делается попытка разработки регионального алгоритма для оценки биомассы цианобактер...
New data on morphology of 7 pennate diatom species from the order Cymbellales found in subpolar meromictic Lake Mogilnoye, are presented. A new species, Rhoicosphenia murmanica Gogorev et E. Lange, sp. Nov., is described. Its frustules are 13-40 μm long, 3.5-6 μm wide, 4-9 μm high and have 16-20 striae per 10 μm on the convex valve and 14-18 on the...
New data on morphology of nine monoraphid diatom species from the order Achnanthales found in late summer in the uppermost brackish-water layer of the unique subpolar meromictic Lake Mogilnoye at salinity to 4 ‰ and temperature about 10 °С are presented. Four taxa, Cocconeis cf. neothumensis var. marina, Planothidium lanceolatum, P. minutissimum an...
The changes in the concentrations of the mineral nitrogen (nitrates and nitrites) and phosphorus and in the state of the planktic communities in the eastern Gulf of Finland following a large-scale invasion of the polychaete Marenzelleria arctia were analyzed. The bioirrigation and bioturbation of the bottom deposits by polychaetes resulted in a dra...
The winter phytoplankton of the Russian part of the hyper-trophic Curonian La-goon (Baltic Sea) was studied in 2010. Diatoms, cyanobacteria and cryptomonads prevailed in phytoplankton. Diatom Aulacoseira islandica was dominant and espe-cially prevailing in the southern area of the lagoon, i.e. the area influenced by the Deyma River. Cyanobacteria P...
New data on the morphology of 11 species of centric and araphid diatoms from the orders Melosirales, Fragilariales, Tabellariales, Rhabdonematales found during the late summer in uppermost brackish-water layer of a unique subpolar meromictic Lake Mogilnoye at salinity to 4 ‰ and temperature about 10 °С are presented. Three species are firstly recor...
New data on morphology of two Chaetoceros species found in a unique subpolar meromectic lake Mogilnoye are presented. The species Chaetoceros muelleri dominates in upper brackishwater layer and in sediments as resting spores.
В коллективной монографии обобщены данные гидробиологических исследований АО ИО РАН 1995–2013 гг. в реке Преголе, водосбор которой охватывает почти всю Калининградскую область, а речной сток является важнейшим режимообразующим фактором для Вислинского залива Балтийского моря. Проанализированы основные антропогенные и природные факторы, определяющие...
The winter phytoplankton of the Russian part of the hyper-trophic Curonian La-goon (Baltic Sea) was studied in 2010. Diatoms, cyanobacteria and cryptomonads prevailed in phytoplankton. Diatom Aulacoseira islandica was dominant and espe-cially prevailing in the southern area of the lagoon, i.e. the area influenced by the Deyma River. Cyanobacteria P...
Materials of seasonal observations of phytoplankton at two permanent stations in the inner and outer parts of the Neva estuary.
The obtained data demonstrate the changes that took place in the species composition and the quantitative development of phytoplankton
during the past two decades. The authors associate these changes with anthropogenic fac...
Phytoplankton was monitored at 38 stations in the eastern Gulf of Finland, including the Neva Bay, from 1978 to 1990. Temporal and spatial variation in biomass was high in all areas, and the highest phytoplankton biomass was found in the shallow water area outside the bay. The dominant group of algae in most parts of the study area were the green a...
The genetic activity of 2-amino-N6-hydroxyadenine or 2-amino-N-hydroxylaminopurine (AHA) and N6-hydroxyadenine or 6-N-hydroxylaminopurine (HAP) was studied in S. typhimurium, E. coli and Saccharomyces cerevisiae strains. AHA was a more potent mutagen for bacteria and a less potent mutagen for yeast than HAP. The mutagenic activity of analogs was no...
