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    Wyświetlanie 1-4 z 4
    Tytuł:
    Benthic Crustacea and Mollusca distribution in Arctic fjord - case study of patterns in Hornsund, Svalbard
    Autorzy:
    Drewnik, A.
    Weslawski, J.M.
    Wlodarska-Kowalczuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48672.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    species distribution
    benthos
    Mollusca
    Crustacea
    distribution
    Arctic fjord
    environmental factor
    benthic species
    bottom water
    water temperature
    Hornsund Region
    Svalbard
    Opis:
    We present the results of species distribution modeling conducted on macrobenthic occurrence data collected between 2002 and 2014 in Arctic fjord – Hornsund. We focus on species from Mollusca and Crustacea taxa. This study investigates the importance of individual environmental factors for benthic species distribution, with a special emphasis on bottom water temperature. It aims to verify the hypothesis that the distribution of species is controlled by low water temperatures in the fjord and that the inner basins of the fjord serve as potential refugia for Arctic species threatened by the climate change-related intensification of warmer water inflows. Our results confirm the importance of bottom water temperature in regulating the presence of benthic fauna in the Hornsund fjord. The distribution of studied species is clearly related to specific water mass – colder (<1°C) or warmer (>1°C); and the preferred temperature regimes seem to be species specific and unrelated to analyzed groups. This study supports the notion that inner basins of the Hornsund fjord are potential refugia for cold water Arctic fauna, while the outer and central basins provide suitable habitats for fauna that prefer warmer waters.
    Źródło:
    Oceanologia; 2017, 59, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two models for absorption by coloured dissolved organic matter (CDOM)
    Autorzy:
    Schwarz, J.N.
    Kowalczuk, P.
    Kaczmarek, S.
    Cota, G.F.
    Mitchell, B.G.
    Kahru, M.
    Chavez, F.P.
    Cunningham, A.
    McKee, D.
    Gege, P.
    Kishino, M.
    Phinney, D.A.
    Raine, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/47774.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    ocean colour
    coloured dissolved organic matter
    surface water
    coastal water
    spectrophotometric measurement
    ultraviolet absorption
    absorption
    Vistula River
    Opis:
    The standard exponential model for CDOM absorption has been applied to data from diverse waters. Absorption at 440 nm (ag440) ranged between close to zero and 10 m−1, and the slope oft he semilogarithmic absorption spectrum over a minimum range of400 to 440 nm (s440) ranged between <0.01 and 0.04 nm−1. No relationship was found between ag440 or s440 and salinity. Except in the southern Baltic, s440 was found to have a broad distribution (0.0165 ± 0.0035), suggesting that it should be introduced as an additional variable in bio-optical models when ag440 is large. An alternative model for CDOM absorption was applied to available high quality UV-visible absorption spectra from the WisGla river (Poland). This model assumes that the CDOM absorption spectrum comprises distinct Gaussian absorption bands in the UV, similar to those ofb enzene. Five bands were fit to the data. The mean central energy ofal l bands was higher in early summer (E ∼7.2, 6.6, 6.4, 6.2 and 5.5 eV or 172, 188, 194, 200 and 226 nm) than in winter. The higher energy bands were found to decay in both height and width with increasing salinity, while lower energy bands broadened with increasing salinity. s440 was found to be correlated with shape parameters of the bands centred at 6.4 and 5.5 eV. While the exponential model is convenient for optical modelling and remote sensing applications, these results suggest that the Gaussian model offers a deeper understanding ofc hemical interactions affecting CDOM molecular structure.
    Źródło:
    Oceanologia; 2002, 44, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Can seabirds modify carbon burial in fjords?
    Autorzy:
    Weslawski, J.M.
    Urbanski, J.
    Gluchowska, M.
    Grzelak, K.
    Kotwicki, L.
    Kwasniewski, S.
    Legezynska, J.
    Wiktor, J.
    Wlodarska-Kowalczuk, M.
    Zaborska, A.
    Zajaczkowski, M.
    Stempniewicz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/47719.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sea bird
    sediment
    organic matter
    Kongsfjorden
    microplankton
    carbon source
    Svalbard Fjord
    Opis:
    Two high latitude fjords of Spitsbergen (Hornsund 77°N and Kongsfjorden 79°N) are regarded as being highly productive (70 g and 50 gC m−2 year−1) and having organic-rich sediments. Hornsund has more organic matter in its sediments (8%), nearly half of it of terrestrial origin, while most of that in Kongsfjorden (5%) comes from fresh, marine sources (microplankton). Analysis of the carbon sources in both fjords shows that a major difference is the much larger seabird population in Hornsund-dominated with over 100 thousands pairs of plankton feeding little auks in Hornsund versus 2 thousand pairs in Kongsfjorden, and marine food consumption estimated as 5573 tonnes of carbon in Hornsund, versus 3047 tonnes in Kongsfjorden during one month of chick feeding period. Seabird colonies supply rich ornithogenic tundra (595 tonnes of C, as against only 266 tonnes of C in the Kongsfjorden tundra). No much of the terrestrial carbon, flushed out or wind-blown to the fjord, is consumed on the seabed – a state of affairs that is reflected by the low metabolic activity of bacteria and benthos and the lower benthic biomass in Hornsund than in Kongsfjorden.
    Źródło:
    Oceanologia; 2017, 59, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of episodic events in the Baltic Sea – combined in situ and satellite observations
    Autorzy:
    Lysiak-Pastuszak, E.
    Bartoszewicz, M.
    Bradtke, K.
    Darecki, M.
    Drgas, N.
    Kowalczuk, P.
    Krasniewski, W.
    Krezel, A.
    Krzyminski, W.
    Lewandowski, L.
    Mazur-Marzec, H.
    Piliczewski, B.
    Sagan, S.
    Sutryk, K.
    Witek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/48563.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    Ferry Box project
    algal bloom
    hepatotoxin
    satellite image
    coastal water
    oceanic water
    salinity
    temperature
    Opis:
    A project was developed concerning the operational system of surveillance and the recording of episodic events in the Baltic Sea. In situ information was to be combined with multi-sensory satellite imagery to determine the extent of algal blooms, to track their evolution and that of rapid environmental events like hydrological fronts. The main element of the system was an autonomous Ferry Box module on a ferry operating between Gdynia and Karlskrona, automatically measuring temperature, salinity and chlorophyll a fluorescence. At pre-selected locations, discrete water samples were collected, which were subsequently analysed for their phytoplankton content, and algal hepato- and neurotoxins; they were also used in toxicity tests with Artemia franciscana.
    Źródło:
    Oceanologia; 2012, 54, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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