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    Wyświetlanie 1-3 z 3
    Tytuł:
    Ecosystem of the Polish part of the Vistula Lagoon from the perspective of alternative stable states concept, with implications for management issues
    Autorzy:
    Kornijow, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/958165.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    aquatic ecosystem
    Vistula Lagoon
    phytoplankton
    macrophyte
    macroinvertebrate
    zooplankton
    fish
    bird
    nutrient concentration
    coastal management
    Baltic Sea
    Źródło:
    Oceanologia; 2018, 60, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A turning point in the development of phytoplankton in the Vistula Lagoon (Southern Baltic Sea) at the beginning of the 21st century
    Autorzy:
    Kownacka, J.
    Calkiewicz, J.
    Kornijow, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079096.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phytoplankton community
    zooplankton
    multiannual change
    nutrient
    biomass
    Vistula Lagoon
    Southern Baltic Sea
    21st century
    Opis:
    Phytoplankton community structure was studied from 2002 to 2016 in the Vistula Lagoon (southern Baltic Sea) in the context of the 2010 shift in its population, as well as the reason for this shift and its environmental impact. This evident shift was indicated by Multidimensional Scaling at the Bray Curtis similarity level of 31%. Before 2010, the primary components of phytoplankton were Cyanobacteria (up to 98% of the biomass, October 2007) and Chlorophyta (40%, July 2002). After 2010, the contribution of Cyanobacteria considerably decreased, and the proportions of other phyla increased. The total phytoplankton biomass positively correlated with phosphorus, and Cyanobacteria biomass with silica. Evident changes were also observed in the seasonal dynamics of phytoplankton. Before 2010, the highest values of biomass occurred in autumn, and were related to high biomass of Cyanobacteria. Higher biomass has been recently reached in spring, during the dominance of Ochrophyta associated with Chlorophyta, Charophyta, and Cryptophyta. Generalised additive models showed a significant decreasing trend of the total phytoplankton biomass, Cyanobacteria, Chlorophyta, and flagellates, suggesting a decrease in eutrophication. This trend is concurrent with a considerable increase in the ratio of zooplankton to phytoplankton biomass since 2010. The increased ratio, however, did not result from elevated zooplankton biomass, but from the drop in phytoplankton biomass. Therefore, the most probable reason for the decrease in phytoplankton biomass was the simultaneous decrease in the concentration of all nutrients. The potential additional impact of filtration by a new alien bivalve Rangia cuneata G. B. Sowerby I, 1832 is also discussed.
    Źródło:
    Oceanologia; 2020, 62, 4PA; 538-555
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of methods for nocturnal sampling of predatory zooplankters in shallow waters
    Autorzy:
    Linkowski, T.B.
    Kornijow, R.
    Kapowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078998.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    plankton
    zooplankton
    predatory species
    Neomysis integer
    Leptodora kindtii
    Cercopagis pengoi
    shallow water
    Vistula Lagoon
    Opis:
    The aim of the study was to assess the suitability of a plankton net (diameter of 60 cm, mesh size of 500 μm) and a column sampler (length of 200 cm, diameter of 5 cm) for estimating the density of zooplankton predatory species (Neomysis integer, Leptodora kindtii, Cercopagis pengoi). Nocturnal sampling was performed once a month (May—November 2018) in the Vistula Lagoon (southern Baltic) in the range depth of 1.3—3.6 m. Statistical analysis indicated no significant differences between the N. integer and C. pengoi density estimated by the two sampling gears. In the case of L. kindtii, the mean density obtained by the column sampler was higher when analyzing all samples together and/or deep-water samples only (p < 0.02). However, no such differences were found at shallow stations i.e. up to ca. 2 m in depth. It was assumed that the more suitable sampling equipment for estimating zooplankton abundance in a shallow, well-mixed transitional (brackish) basin is the column sampler. This type of gear, so far used mainly for sampling of micro and mesozooplankton, allows the simultaneous nocturnal collection of the entire zooplankton size spectrum, including representatives of large predatory species. The suitability of light traps for qualitative studies of zooplankton species responding positively to light under the high turbidity of the Vistula Lagoon was also investigated. The traps proved to be most useful for N. integer (100% frequency), and much less for L. kindtii (46.2%) and C. pengoi (27.3%).
    Źródło:
    Oceanologia; 2021, 63, 1; 71-79
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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