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  • Articles  (4)
  • Biology  (4)
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  • Articles  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Sub-ice algal assemblages of the Barents Sea: Species composition, chemical composition, and growth rates (1992)
    Springer
    Polar biology 12 (1992), S. 485-496 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ice algae of the Barents Sea were studied from 1986 to 1988. With a few exceptions, the ice algal assemblages were dominated by pennate diatoms. From March to early June there was a transition from a mixed population of both centric and pennate diatoms at the start into a well developed Nitzschia frigida assemblage. Nutrier ts in ice-covered regions were high in spring, and high N/C and protein/carbohydrate ratios indicated no nutrient deficiency in the ice algae. The N/P ratios were lower than 15, but comparable to ratios of three ice algae species grown in culture at -0.5 °C and various light conditions. The Si/N ratios were lower than corresponding ratios from the Canadian Arctic and the Antarctic. The chemical composition revealed that silicate limited growth cannot be excluded. The cells were heavily shade-adapted the entire spring season, with high Chl/C ratios (0.045–0.084), comparable to the cultures growing at low irradiances. The growth rates in the cultures peaked at 50 μmol m-2s-1 with maximum rates of 0.6–0.8 div. day-1, both for 12 and 24 h day lengths. The low growth rates for the May assemblages (max 0.20 div. day-1) indicated strong light limitation by self-shading. Adaptation experiments showed that some ice algae are highly adaptable, while others are not able to adjust to new irradiances. Their growth rates are inhibited by high irradiances and this may affect the distribution in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238187
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photoadaptation in marine Arctic diatoms (1989)
    Springer
    Polar biology 9 (1989), S. 479-486 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Photoadaptation in some marine Arctic diatoms has been studied. Thalassiosira antarctica, Nitzschia delicatissima and Chaetoceros furcellatus were grown at-0.5°C and various irradiances and continuous light. Growth and cellular chlorophyll were followed during transitional phase after the algae had been transferred from one irradiance to another. Adaptation time for cellular chlorophyll was linearly related to the gradient in irradiance, and adaptation to transfer from high to low light was faster than from low to high light. Adaptation time was found to be species dependent, and Arctic diatoms growing at low temperature seemed to adapt as fast as temperate species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261029
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photoadaptation of sea-ice microalgae in the Barents Sea (1991)
    Springer
    Polar biology 11 (1991), S. 179-184 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Variations in under-ice scalar irradiance, P vs I parameters and the CHLa C−1 ratio of natural assemblages of sea-ice microalgae from the Barents Sea growing at -1.8°C in May and September 1988 are described, including one diurnal station. CHLa C−1 ratios of 0.031–0.071 mg mg−1 indicate shade adaptated assemblages both in May and September. Values for αB (photosynthetic efficiency) were generally low, e.g. 0.0025–0.0078 mg C (mg CHLa)−1 h−1 (μmol m−2 s−1)−1, and should be typical for self-shaded algae in mats or aggregates of about 4 mm thickness. Provided no self shading and the typical spectral distribution of light under ice without algae, αB would, however, be about 2.5 times higher. Photoinhibition of the photosynthetic response was negligible. Maximum carbon uptake P m B was 0.15–0.24 and 0.032–0.088 mg C (mg CHLa)−1 h−1 in May and September, respectively. Diurnal variations were small, particularly for P m B . Calculations of the maximum specific gross growth rate yielded an upper limit of 0.20–0.24 and 0.01–0.04 d−1 for assemblages in May and September, respectively; the latter may have been in a resting stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00240206
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Phytoplankton of the Barents Sea - the end of a growth season (1997)
    Springer
    Polar biology 17 (1997), S. 235-241 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Few phytoplankton investigations have been carried out at the end of the growth season, particularly in the Arctic. In the present study, we monitored the phytoplankton distribution in relation to environmental conditions in the Barents Sea in September 1988 and October 1987. An ice-edge bloom was found in September at 80° N in a stratified meltwater layer, lasting until new ice formation and southward advection of the ice cover commenced in the middle of the month. Phytoplankton populations in the marginal ice zone at this time were not nutrient limited, but biomass was probably reduced due to grazing by small copepods. Lower chl/C and chl/N ratios in the phytoplankton above the pycnocline than below in September indicated light-adapted populations. In October the particulate matter was rich in carbon, but had low chlorophyll content, indicating high levels of detritus. The hydrographic conditions in October differed greatly from those observed in September. The combination of freezing and mixing resulted in higher salinity and nutrient concentrations, and caused a homogeneous distribution, as well as reduction, of the phytoplankton stocks in the upper water column. During late October, low incoming radiation, combined with deep vertical mixing, resulted in light-limiting conditions for the algae, eventually stopping photosynthesis and terminating the growth season in the northern Barents Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050127
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    Paper (German National Licenses)
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