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  • 1
    Call number: 13/M 02.0566 ; AWI G9-02-0178
    In: Ecological studies
    Type of Medium: Monograph available for loan
    Pages: XIX, 427 S.
    ISBN: 3540422684
    Series Statement: Ecological studies 154
    Classification: D.5.
    Language: English
    Location: Reading room
    Location: Reading room
    Branch Library: GFZ Library
    Branch Library: AWI Library
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  • 2
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Knowledge of the environmental controls of carbon dioxide fluxes is essential for understanding the dynamics of carbon exchange between ecosystems and atmosphere. In this study we investigated soil respiration and moss photosynthesis as well as their contribution to the net carbon dioxide flux of two different wet tundra systems. During two summers, in situ carbon dioxide fluxes were measured in a tussock tundra and in a low-centre polygonal tundra on Taimyr Peninsula, central Siberia. Measurements were carried out by means of a multichannel gas exchange system. Results show pronounced differences in soil respiration rates as related to microscale topography, mainly due to differences of soil water table and soil temperatures. Modelling of soil respiration for individual microsites revealed differences of process performance with respect to both factors. The wet microsites showed the highest potential regarding an increase of soil respiration rates in warmer and drier climate change scenarios. Another important process compensating the CO2 release from the soil was the photosynthesis of the moss layer, assimilating as much as 51% to 98% of the daily amount of carbon dioxide released from wet tundra soils. This result demonstrates the importance of mosses in the context of tundra ecosystem processes. The magnitude of net system fluxes of the whole system at the depression of the polygonal tundra was strongly influenced by changes in soil water table. Consequently, any changes of the hydrology, as anticipated in the context of global change, would effectively alter the carbon balance of wet tundra systems.
    Type of Medium: Electronic Resource
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  • 3
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    Oxford Univ. Pr.
    In:  In: Oxford Bibliographies in Ecology. Oxford Univ. Pr., New York, USA, ..
    Publication Date: 2014-02-18
    Description: The polar regions have gained the attention of scientists and the general public alike, especially since explorers first visited these remote and inhospitable places, characterized by the most extreme climatic conditions on Earth, and reported their fascination about them. Scientific research, in the modern sense, however, started little more than one hundred years ago, with Fridtjof Nansen’s seminal Fram expedition to the Arctic Ocean (1893–1896). The early studies that followed the “heroic phase” of the exploration of the polar regions addressed a wide variety of topics, ranging from broad landscape descriptions to very detailed analyses of individual species, adaptations, or metabolic pathways. Much work was done on ecological aspects of the polar environments and their differentiation into geographical and biotic regions. The exploitation of the surprisingly great wealth of natural resources the polar regions house, such as the rich whale populations and, later, the abundant Antarctic krill in the Southern Ocean, were an important driving force behind many ecological investigations. In the recent past, the study of the impacts of climate change, which are particularly severe in both polar regions, came increasingly into focus of researchers. Scientific fieldwork in polar regions is difficult and costly, and since the early days, ecological research has largely been conducted within the framework of multidisciplinary, often international projects. Over the last three decades, international cooperation in polar research has greatly increased, most often under the wings of the Scientific Committee on Antarctic Research (SCAR) and the International Arctic Science Committee (IASC).
    Type: Book chapter , NonPeerReviewed
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  • 4
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    Institut für Polarökologie Kiel
    In:  Mitteilungen zur Kieler Polarforschung, 12 . pp. 6-11.
    Publication Date: 2017-03-17
    Type: Article , NonPeerReviewed
    Format: text
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  • 5
    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
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  • 6
    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
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Polar biology 5 (1986), S. 199-206 
    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
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  • 8
    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
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  • 9
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    Institut für Polarökologie Kiel
    In:  Mitteilungen zur Kieler Polarforschung, 16 . pp. 16-19.
    Publication Date: 2017-03-14
    Type: Article , NonPeerReviewed
    Format: text
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  • 10
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    Institut für Polarökologie Kiel
    In:  Mitteilungen zur Kieler Polarforschung, 17 . pp. 18-21.
    Publication Date: 2017-03-23
    Type: Article , NonPeerReviewed
    Format: text
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