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Wyszukujesz frazę "oligotrophic" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Seasonal changes in phytoplankton on the north-eastern shelf of Kangaroo Island (South Australia) in 2012 and 2013
    Autorzy:
    Balzano, S.
    Ellis, A.V.
    Le Lan, C.
    Leterme, S.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/48218.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phytoplankton
    Bacillariophyceae
    Dinoflagellata
    Cryptophyta
    bacteria
    seasonal change
    picoplankton
    nutrient concentration
    oligotrophic environment
    Kangaroo Island
    South Australia
    Źródło:
    Oceanologia; 2015, 57, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of Eastern Indian Ocean (ODP Site 762B) benthic foraminiferal assemblages to the closure of the Indonesian seaway
    Autorzy:
    Rai, A.K.
    Singh, V.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/48495.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Indian Ocean
    benthic foraminifera
    productivity
    upwelling
    oligotrophic water
    surface water
    Pliocene
    atmospheric circulation
    ocean circulation
    thermohaline circulation
    Źródło:
    Oceanologia; 2012, 54, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutrient flux fuels the summer primary productivity in the oligotrophic waters of the Gulf of Aqaba, Red Sea
    Autorzy:
    Badran, M.I.
    Rasheed, M.
    Manasrah, R.
    Al-Najjar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/47744.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Aqaba Gulf
    biological stress
    diffusion model
    chlorophyll a
    oligotrophic water
    primary productivity
    thermohaline stratification
    nutrient flux
    Red Sea
    Opis:
    The thermohaline characteristics of the Gulf of Aqaba, Red Sea, depict a welldefined seasonal pattern of winter mixing from December to April and summer stratification from May to November. This thermohaline structure is a major controlling factor of the nutrient, chlorophyll a and primary productivity seasonal cycles. The nitrate and chlorophyll a concentration records generated down to 200 m at a vertical resolution of 25 m – weekly during 1994, 1995 and every two weeks from April 1997 through to December 2000 – are employed to assess the nitrogen flux across the summer thermocline of the Gulf of Aqaba. The flux calculations are based on a simple diffusion model that incorporates the physical stress eddy diffusivity factor Kz and a biological stress factor k. Both Kz and k are calculated using the Michaelis-Menten equation and the nitrate concentration gradient. The total nitrate flux of the Gulf of Aqaba during the seven summer months (May–November) is estimated at 0.52 moleN m−2. In relation to established primary productivity values (75.5 gC m−2 (May November)−1) and the generated chlorophyll a records, this yields an f fraction of new to total primary production of 0.50. This relatively high f value is discussed with respect to the geophysical characteristics of the Gulf of Aqaba and similar oceanic basins. The remaining 50% is accounted for by cross-sectional flow from the relatively nutrientrich coral reef coastal habitat and rapid recycling, triggered by high irradiance and water temperature.
    Źródło:
    Oceanologia; 2005, 47, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of phytoplankton along the thermohaline gradient in the North-Eastern Adriatic channel; winter aspect
    Autorzy:
    Vilicic, D.
    Kuzmic, M.
    Bosak, S.
    Silovic, T.
    Hrustic, E.
    Buric, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/47482.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Adriatic Sea
    chlorophyll
    diatom
    dinoflagellate
    distribution
    nutrient
    oligotrophic water
    phytoplankton composition
    picoplankton
    salinity
    temperature
    thermohaline
    transition zone
    water transparency
    Opis:
    The distribution of phytoplankton and its relation to the hydrographic features in the north-eastern Adriatic was investigated in February 2008. The area of interest included a thermohaline gradient in the channel situated between the coast and the islands lying parallel to the coast. The gradient is controlled by the influx of oligotrophic karstic riverine water at the south-eastern end,subma rine springs in the middle part,an d warmer offshore waters at the north-western end of the channel. The change of temperature and salinity in the estuarine transition zone was accompanied by abundant diatoms and dinoflagellates below the halocline,with dominant chain-forming diatoms (Chaetoceros, Bacteriastrum) in abundances reaching 5×105 cells dm−3. The impact of coastal submarine springs detected by infrared remote sensing resulted in the growth of cyanobacteria in the nitrogen-depleted surface waters. The greater contribution of picoplankton, as well as of nanoplanktonic coccolithophorids and cryptophytes,in the outer channel system indicated their preference for oligotrophic conditions. Flow cytometric counts of nanophytoplankton were 10–30 times greater than inverted microscope counts. Cyanobacteria were about five times more abundant than picoeukaryotes. The study demonstrates how different techniques (remote sensing and in situ investigations) can be useful in understanding the biological and hydrographic set-up in the specific oligotrophic eastern Adriatic coastal environment.
    Źródło:
    Oceanologia; 2009, 51, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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