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  • 1
    Electronic Resource
    Electronic Resource
    Distribution of particulate amino acids in the Bransfield Strait (1986)
    Springer
    Polar biology 5 (1986), S. 199-206 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The depth distribution and composition of residual amino acids was determined in December 1980 in the Bransfield Strait. The major components were aspartic and glutamic acids together with alanine, glycine and serine. Non-protein amino acids were not found in significant amounts. On the average, the amino acids accounted for 25% of the total organic carbon and 50% of the organic nitrogen. Amino acid nitrogen/chlorophyll ratios indicated that in most euphotic zone samples phytoplankton in good physiological condition was present whereas heavily degraded material was found in deeper water layers. Statistical treatment and cluster analysis show distinct differences between euphotic and aphotic zone samples which could be used to characterize phytoplankton communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446087
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution of bacterial numbers and biomass in soils and on plants from King George Island (Arctowski Station, Maritime Antarctica) (1995)
    Springer
    Polar biology 15 (1995), S. 115-124 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bacterial numbers and biomass associated with soils and plants from King George Island, Maritime Antarctica, were analysed by epifluorescence microscopy. Sampling was carried out during austral summer 1992/1993 at different sites in the vicinity of Arctewski Station. The sites were located at areas with different plant cover. Soil samples were taken to a depth of 50 cm. All microscopic analyses were carried out in the laboratory immediately after sampling. The bacterial community showed great variations related to soil organic matter and plant cover. Highest values of number and biomass of bacteria were found in the surface layers as well as on leaves of Deschampsia antarctica and Colobanthus quitensis. Lichen (Usnea antarctica, U. aurantiaco-atra) were much less covered with bacteria. Mean cell volume of bacteria can be regarded as an important descriptor of the bacterial community. Changes in this parameter can be related to environmental factors. Fungi and yeasts were seldom observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241049
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of carbohydrates and leucine on growth of bacteria from Antarctic soils (Casey Station, Wilkes Land) (1993)
    Springer
    Polar biology 13 (1993), S. 297-306 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Growth rates of natural bacterial communities from Antarctic soils are analysed by an epifiuorescence microscopic method using data of microcolonies (colony number and colony areas). Incubations are performed on polycarbonate filters which are put on cellulose pads soaked with soil extracts, different concentrations of naturally occuring carbohydrates, polyols, and leucine. Concentrations of individual substrates were in the range of naturally occuring levels. The results showed that the growth of bacterial microcolonies could best be stimulated with glucose, sucrose, maltose, sorbitol, and mannitol. Leucine stimulated growth to a lower extent than glucose. Data on bacterial biomass production calculated from this approach are discussed in relation to those from tracer techniques carried out with 14C-labelled glucose from earlier experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238356
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of microclimatic conditions on potential photosynthesis ofUsnea sphacelata: A model (1989)
    Springer
    Ecological research 4 (1989), S. 297-307 
    Details
    ISSN: 1440-1703
    Keywords: Antarctica ; Lichen activity ; Microclimate ; Modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract At a boulder on a hill near Casey Station, Wilkes Land, sensors for light, temperature and humidity were installed facing the four cardinal directions. The measurements lasted for about two months of the summer season 1985/86. The data recording was carried out at intervals of 6 minutes for all probes by automatic recording instruments. Data analysis was carried out with special regard to the biological effects of the parameters analyzed. These data of the microclimatic features taken from its original place of growth were used to a regression model of potential photosynthetic activity ofUsnea sphacelata, which is a characteristic species of this area. Although the individual time courses of the above mentioned parameters show long periods of favourable conditions for possible growth and metabolic processes, the combined analysis of these variables considering threshold values for metabolism shortens these time spans drastically. Thus, cross relationships within the physical descriptors and their effects on the actual values of photosynthesis as well as respiration become evident. They are illustrated by the results of models on photosynthesis and respiration ofU. sphacelata regarding the different cardinal directions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02348450
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    Paper (German National Licenses)
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