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  • 1
    Monograph available for loan
    Monograph available for loan
    Oxford : Oxford University Press
    Call number: AWI G2-14-0056
    Description / Table of Contents: Contents: 1 An introduction to Antarctic lakes. - 1.1 Introduction. - 1.2 History of Antarctic limnology and logistics. - 1.3 Climatic conditions in Antarctica. - 1.4 Glaciological history of Antarctica. - 1.5 Diversity of lakes. - 1.6 Lake types and geochemical conditions. - 1.6.1 Salinity. - 1.6.2 Redox conditions. - 1.6.3 Nutrient and organic carbon supply. - 1.6.4 Geochemical indicators of lake history. - 1.7 Geomorphology of Antarctic lakes. - 1.8 Antarctic lake biota. - 1.8.1 Archaea and Bacteria. - 1.8.2 Viruses. - 1.8.3 Protozoa. - 1.8.4 Algae. - 1.8.5 Rotifers. - 1.8.6 Crustaceans. - 1.8.7 Other invertebrates. - 1.9 Habitats in Antarctic lakes. - 2 Freshwater lakes. - 2.1 Introduction. - 2.2 Formation of freshwater lakes. - 2.3 Temperature and stratification. - 2.4 Water chernistry. - 2.5 The planktonic biota of freshwater lakes. - 2.5.1 Heterotrophic bacteria. - 2.5.2 Viruses. - 2.5.3 Protozoa. - 2.5.4 The phytoplankton. - 2.5.5 The zooplankton. - 2.6 Carbon cycling in the planktonic environment. - 2.6.1 Primary production. - 2.6.2 Bacterial production. - 2.6.3 Heterotrophic grazing. - 2.7 The benthic communities. - 2.7.1 Phototrophic benthic communities. - 2.7.2 Heterotrophic benthic communities. - 2.7.3 Carbon cycling in the benthos. - 3 Saline lakes. - 3.1 Introduction. - 3.2 Distribution of saline lakes in Antarctica. - 3.3 Formation of saline lakes. - 3.4 Patterns of stratification and temperature. - 3.5 Water chemistry. - 3.6 The planktonic biota of saline lakes. - 3.6.1 Heterotrophic Bacteria and Archaea. - 3.6.2 Photosynthetic bacteria. - 3.6.3 Viruses. - 3.6.4 Protozoa. - 3.6.5 Algae. - 3.6.6 Zooplankton. - 3.7 Carbon cycling in the plankton. - 3.7.1 Primary production. - 3.7.2 Bacterial production. - 3.7.3 Heterotrophic grazing and carbon cycling. - 3.8 The biota of saline Iake ice covers. - 3.9 The benthic community. - 3.10 Carbon cycling in the benthos. - 3.11 A unique Antarctic Iake - Lake Vida. - 4 Epishelf lakes. - 4.1 Introduction. - 4.2 Formation and physico/chemical characteristics of epishelf lakes. - 4.2.1 Geomorphology. - 4.2.2 Physico/chemical characteristics. - 4.3 The planktonic biota of epishelf lakes. - 4.4 Carbon cycling in the plankton of epishelf lakes. - 4.5 The benthic communities of epishelf lakes. - 5 Lakes and ponds on glaciers and ice shelves. - 5.1 Introduction. - 5.2 Supraglacial lakes. - 5.2.1 Types of cryolakes. - 5.2.2 The physical/chemical environment and biology of cryolakes. - 5.3 Ice shelf ponds and lakes. - 6 Subglacial lakes. - 6.1 Introduction. - 6.2 Distribution and physiographic characteristics of subglacial lakes in Antarctica. - 6.3 Detailed studies of subglacial lakes. - 6.3.1 Lake Vostok. - 6.3.2 Lake Ellsworth. - 6.3.3 Lake Whillans. - 6.3.4 Hodgson Lake. - 6.4 Formation of subglacial lakes and hydrological conditions. - 6.5 Geochemical conditions in subglacial lakes. - 6.6 The biota of subglacial lakes. - 7 Conclusions and future directions. - 7.1 Antarctic lakes in a global context. - 7.2 Inter-annual variations and Ionger-term trends. - 7.3 The gaps in the data - the way forward. - 7.4 Future directions. - Glossary. - References. - Index.
    Description / Table of Contents: The Antarctic continent carries the greatest diversity of Iake environments on the planet: freshwater and saline lakes, tidal freshwater epishelf lakes, lakes on ice shelves and glacier surfaces, and over three hundred subglacial lakes; extraordinary ecosystems that have been separated from the atmosphere for up to millions of years. This book provides a unique and cutting edge synthesis of Antarctic limnology, drawing together current knowledge on geomorphology, morphometry, chemistry, community structure and function. lt emphasises throughout the value of these near-pristine ecosystems as barometers of climate change, showing how responsive and vulnerable they are to the indirect impacts of anthropogenic activity. Antarctic Lakes begins with an introduction to their physical, chemical, and biological characteristics, providing a basis for understanding the subsequent detailed chapters on different Iake types, and ends with a chapter considering the application of new technologies to polar limnology as well as identifying future research directions. This accessible text is suitable for both senior undergraduate and graduate students taking courses in Antarctic and polar limnology, and will also be of broad interest to researchers working in the areas of polar science, microbial ecology (and extremophiles), climatology, glaciology, and astrobiology.
    Type of Medium: Monograph available for loan
    Pages: ix, 215 S. : Ill., graph. Darst., Kt.
    Edition: 1st ed.
    Branch Library: AWI Library
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  • 2
    Publication Date: 2013-04-01
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
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  • 3
    Publication Date: 2013-06-26
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
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  • 4
    ISSN: 1573-5117
    Keywords: anoxia ; benthos ; copepod ; diapause ; migration ; stratification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The spatial and temporal distribution of the benthic cyclopoid copepods, Acanthocyclops viridis, Acanthocyclops bicuspidatus, Eucyclops agilis, Paracyclops fimbriatus and Macrocyclops albidus in a small eutrophic lake Esthwaite Water, Cumbria was investigated in 1982 and 1983. The behavioural and physiological mechanisms by which these organisms cope with the conditions of hypoxia and anoxia prevalent during seasonal stratification of the lake waters was considered. During stratification all of these species, with the exception of resting stage A. bicuspidatus, disappeared from the profundal zone and were limited to the shallower margins of the lake. None of these copepod species entered the plankton and established planktonic populations, none appeared capable of sustained anaerobic respiration, although all can withstand some degree of hypoxia, and only A. bicuspidatus appeared capable of entering resting stages. The data suggest that in eutrophic lakes species normally found in the profundus deal with anoxia by lateral migration to shallow waters where oxygen is available.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-5117
    Keywords: Chlorophyll a ; ciliate ; epilimnion ; flagellate ; protozooplankton ; oxygen ; sarcodine ; water column
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The temporal and spatial distribution of planktonic protozoa of Esthwaite, a eutrophic lake, was investigated at 7–10 day intervals between February to October 1988. Sarcodine protozoa were of little significance, the plankton was dominated by ciliates and flagellates. Ciliate density peaked in late May to early June with densities reaching 9.2 × 103 1-1. There was considerable variation in spatial distribution and greatest species diversity occurred in March/April. After the establishment of summer stratification the planktonic ciliates were confined to water of 〉25% oxygen saturation in the water column. Oligotrichs, particularly the genus Strombidium and tintinnids, and peritrichs dominated the ciliate assemblages. There was no correlation between chlorophyll a concentrations and ciliate numbers, but a correlation was apparent between ciliate numbers and flagellate density. There were significant differences between the protozooplankton communities at the different sampling sites in the lake.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 203 (1990), S. 111-119 
    ISSN: 1573-5117
    Keywords: ciliate ; protozooplankton ; oxygen ; epilimnion ; hypolimnion ; benthos ; migration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The seasonal distribution of benthic species in the water column above and below the thermocline in a small eutrophic lake is described. During summer stratification populations of Spirostomum spp, Loxodes spp., Plagiopyla and Deltopylum become established in the plankton on or below the oxycline/thermocline. At shallow sites no migration occurred and populations of the migratory species in the benthos were sparse, with the exception of Plagiopyla which occurred in high densities in the sediment. Two distinct planktonic populations are established during stratification: an epilimnetic community of obligate planktonic ciliates and a hypolimnetic community of benthic migrants.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-5117
    Keywords: anoxia ; behaviour ; copepod ; hypoxia ; migration ; respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of four benthic cyclopoid copepods, Acanthocyclops viridis (Megacyclops viridis) (Jurine, 1820), Macrocyclops albidus (Jurine), Eucyclops agilis (Koch, Sars) (Eucyclops serrulatus) (Fischer, 1851) and Paracyclops fimbriatus (Fischer), to hypoxia and anoxia was investigated. All of these species died within six hours when confronted by totally anoxic conditions, but all survived four days at oxygen saturation levels as low as 25%. Males succumbed to the effects of anoxia more rapidly than the larger females of each species, and larger species survived for shorter periods than smaller species. In artificially stratified columns, where the lower layer was anoxic, all four species displayed an upward migratory response towards oxygenated conditions. Where the artificial hypolimnion was hypoxic, however, the migratory response was not observed. The results suggest that some benthic copepods cope with seasonal anoxia in eutrophic stratified lakes by migration rather than the various physiological adaptations shown by planktonic and semi-planktonic species.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-5117
    Keywords: anoxia ; behaviour ; copepod ; hypoxia ; migration ; respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of four benthic cyclopoid copepods,Acanthocyclops viridis (Megacyclops viridis) (Jurine, 1820),Macrocyclops albidus (Jurine),Eucyclops agilis (Koch, Sars) (Eucyclops serrulatus) (Fischer, 1851) andParacyclops fimbriatus (Fischer), to hypoxia and anoxia was investigated. All of these species died within six hours when confronted by totally anoxic conditions, but all survived four days at oxygen saturation levels as low as 25%. Males succumbed to the effects of anoxia more rapidly than the larger females of each species, and larger species survived for shorter periods than smaller species. In artificially stratified columns, where the lower layer was anoxic, all four species displayed an upward migratory response towards oxygenated conditions. Where the artificial hypolimnion was hypoxic, however, the migratory response was not observed. The results suggest that some benthic copepods cope with seasonal anoxia in eutrophic stratified lakes by migration rather than the various physiological adaptations shown by planktonic and semi-planktonic species.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-5117
    Keywords: bacterivore ; nematode ; sewage treatment ; spatial distribution ; seasonal distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The spatial and temporal distribution of nematodes in two low rate percolating filter bed sewage treatment plants at Carnforth and Caton, Lancashire, were investigated. Nematodes were abundant reaching densities up to 900 cm−2 of media surface. Numbers decreased down the bed and species composition displayed spatial differences with bed depth. Eight orders of nematode were represented, members of the sub-family Diplogasterinae and Rhabditinae were particularly common. A seasonal pattern of abundance was clearly apparent; two peaks occurred, one in May and a second during the winter months. Lowest numbers corresponded with periods of highest temperature. The demise of the nematodes in the spring was related to the sloughing of the surface film on the media.
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 1988-02-01
    Print ISSN: 0262-6667
    Electronic ISSN: 2150-3435
    Topics: Geography
    Published by Informa UK Limited
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