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    Wyświetlanie 1-7 z 7
    Tytuł:
    Planktonic Ciliates of the Neva Estuary (Baltic Sea): Community Structure and Spatial Distribution
    Autorzy:
    Mironova, Ekaterina
    Telesh, Irena
    Skarlato, Sergei
    Powiązania:
    https://bibliotekanauki.pl/articles/763523.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Ciliates, mixotrophs, plankton, Neva Estuary, Baltic Sea
    Opis:
    Ciliate communities in open waters of the meso-eutrophic Neva Estuary (the Baltic Sea) were studied in summer 2010. Abundance and biomass of ciliates were surprisingly low (0.03–1.9 ind ml–1 and 0.04–2.4 × 10–3 μg C ml–1), especially in samples with high detritus content. During this study we detected four ciliate species which are new for the Baltic Sea. Mixotrophic ciliates dominated at the majority of stations (28–67% of overall ciliate numbers). Their contribution was significantly higher in the outfall area and northern part of the Neva Estuary (Resort District), where total density of ciliates was low. Medium-sized ciliates (30–60 μm) were the most diverse and abundant (average contribution 59% of total abundance). The two parts of the estuary, separated from each other by a storm-surge barrier, differed slightly in their community structure (p < 0.05) but did not significantly differ in ciliate numbers and biomass values.
    Źródło:
    Acta Protozoologica; 2013, 52, 1
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Expansion of the North American amphipod Gammarus tigrinus Sexton, 1939 to the Neva Estuary (Easternmost Baltic Sea)
    Autorzy:
    Berezina, N.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48222.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    amphipod
    expansion
    American amphipod
    history
    Gammarus tigrinus
    Baltic Sea
    Neva Estuary
    Opis:
    The North American gammaridean amphipod, Gammarus tigrinus, was found in the easternmost part of the Baltic Sea (Neva Estuary) near a new oil terminal. This species may well have been transported to the Neva Estuary with ballast waters from the Finnish area of the Gulf of Finland, where it was recorded recently. In 2005, the mid-summer density of G. tigrinus was 27 indiv. m−2. By 2006 this species had spread 100 km to the east from the first site, colonizing the northern coastal zone of the estuary. Its density reached 99–126 indiv. m−2. Fecund females and juveniles contributed about 50% to the entire population density, which testifies to the successful reproduction and establishment of G. tigrinus in the Neva Estuary. There is a high risk of further expansions of G. tigrinus from the new area to the various lakes of Eastern Europe via inland canal-river systems, which may lead to unforeseeable changes in aquatic communities.
    Źródło:
    Oceanologia; 2007, 49, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of environmental variables on midsummer dinoflagellate community in the Neva Estuary (Baltic Sea)
    Autorzy:
    Golubkov, M.
    Nikulina, V.
    Golubkov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/48841.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    dinoflagellate
    phytoplankton
    eutrophication
    environmental variability
    climate change
    Neva Estuary
    Baltic Sea
    Źródło:
    Oceanologia; 2019, 61, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal dynamics of phytoplankton in the inner Neva Estuary in the 1980s and 1990s
    Autorzy:
    Nikulina, V.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/47983.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    species composition
    biomass
    Neva River
    alga
    blue-green alga
    Oscillatoria
    phytoplankton
    Neva Estuary
    seasonal dynamics
    Opis:
    The phytoplankton in the inner Neva Estuary is described from data obtained from 1996 to 2000.T he seasonal dynamics of the phytoplankton biomass are characterized by a bimodal curve with a summer maximum.T he average seasonal biomass was approximately 3 mg l−1, the maximum biomass was 8–11 mg l−1. The species composition and quantitative parameters were compared to those observed in the 1980s.A notable, nearly 1.5–2 fold, increase in the biomass in the summer–autumn period and the predominance of Oscillatoria species among the blue-green algae were observed.A decline in the nutrient load in the water body at the end of the 1990s appeared to be insufficient to bring about a decrease in the proportion of Oscillatoria algae in the total species composition or a decline in the biomass of the entire phytoplankton community. In 2000 a certain change in the structural composition of the phytoplankton complex was noted.S pecies that had been predominant in the 1980s and had lost their advantage in the early 1990s, regained their earlier status.
    Źródło:
    Oceanologia; 2003, 45, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Species-level associations of phytoplankton with environmental variability in the Neva Estuary (Baltic Sea)
    Autorzy:
    Golubkov, M.
    Nikulina, V.
    Golubkov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079009.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phytoplankton
    environmental variability
    climate change
    eutrophication
    algal bloom
    harmful alga
    long-term observation
    Neva Estuary
    Opis:
    Changes in phytoplankton communities due to anthropogenic nutrient load and climate change often lead to eutrophication and harmful algal blooms that can affect biogeochemical cycling. However, little is known about the specific responses of various species to environmental variables. 17-year long data on the midsummer phytoplankton biomass in the Neva Estuary were analyzed to show the changes in the composition of phytoplankton in relation to water depth, transparence, salinity, temperature, concentrations of total phosphorus and chlorophyll a, and plankton primary production. One hundred seventy-four species and forms from eight taxonomic classes were found in phytoplankton. Fifteen species were potentially harmful. The most diverse and abundant groups were cyanobacteria, green algae and diatoms. Canonical Correspondence Analysis showed that the biomass of various species from each phytoplankton group correlated differently with environmental factors. However, within each group, there were some predominant trends in the correlative response to changes in environmental variables. The biomass of cyanobacteria was high in the middle and lower reaches of the estuary and, in general, positively correlated with water salinity. The biomass of most species of green algae and diatoms correlated negatively with it. These algae showed a positive trend in biomass in the upper and middle reaches of the estuary during the last decades that may be explained by changes in weather conditions. Taking into account that climate models predict future increases in precipitation and temperature in the northern Baltic, the future expansion of freshwater phytoplankton species in estuaries of the northern Baltic Sea is very likely.
    Źródło:
    Oceanologia; 2021, 63, 1; 149-162
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High resolution 3D-ecosystem model for the Neva Bay and Estuary - model validation and future scenarios
    Autorzy:
    Korpinen, P.
    Kiirikki, M.
    Rantanen, P.
    Inkala, A.
    Sarkkula, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48047.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    biomass
    water protection
    St.Petersburg
    chlorophyll a
    phosphorus precipitation
    municipal waste water
    ecosystem
    phytoplankton
    nutrient dynamics
    Neva Estuary
    Neva Bay
    Opis:
    We have used a simple 3D-ecosystem model to describe nutrient dynamics and biomass production in the Neva Bay off St.Petersburg. The River Neva is responsible for carrying the waste waters of St. Petersburg to the Gulf of Finland. Literature values of chlorophyll-a concentrations and satellite images have been used for model validation. The results indicate that our model can reproduce both the temporal and spatial variation in the phytoplankton biomass with reasonable accuracy. The model was used to analyse scenarios describing the ecological effects of planned water protection measures. More efficient phosphorus purification was found to be the most effective measure for improving the water quality off St.Petersburg.
    Źródło:
    Oceanologia; 2003, 45, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional response of midsummer planktonic and benthic communities in the Neva Estuary (Eastern Gulf of Finland) to anthropogenic stress
    Autorzy:
    Golubkov, S.M.
    Alimov, A.F.
    Telesh, I.V.
    Anokhina, L.E.
    Maximov, A.A.
    Nikulina, V.N.
    Pavel'eva, E.B.
    Panov, V.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/48595.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    coastal zone
    primary production
    Finland Gulf
    benthic community
    planktonic community
    anthropogenic stress
    functional response
    eutrophication
    Neva Estuary
    Opis:
    Long-termhydrobiological research has shown that the functioning of the ecosystem of the Neva Estuary, one of the largest Baltic estuaries, has changed greatly since the beginning of the 20th century. Ineffective local water management in St.Petersburg during the last twenty years has stimulated the development of a natural ‘biological plug’ in the salt barrier zone in the inner part of the estuary and has altered the ecosystem’s functioning. These changes include an increase in primary production, in the primary production : organic matter decomposition ratio, and in pelagic-benthic coupling. It has also given rise to filamentous algae blooms and intensive secondary pollution in the coastal zone of the Neva Estuary. The primary production of phytoplankton in the inner part of the estuary has reached 2.3 gC m−2, that of the filamentous algae Cladophora glomerata 5.5 gC m−2; these figures are much higher than in other regions of the Gulf of Finland.
    Źródło:
    Oceanologia; 2003, 45, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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