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  • 1
    Electronic Resource
    Electronic Resource
    Alpine newts (Triturus alpestris) as top predators in a high-altitude karst lake: daily food consumption and impact on the copepod Arctodiaptomus alpinus (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 33 (1995), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Population dynamics and feeding ecology of adult and larval alpine newts (Triturus alpestris, Laurenti) were investigated in a high-altitude karts lake to estimate their feeding pressure on the copepod Arctodiaptomus alpinuf (Imhof). Estimates of population size for reproducing adults ranged from 666 to 864 individuals in the lake during July and August. Total abundance of larvae before the onset of ice cover varied considerably between 4400 and 25400 individuals in different years.2. Arctodiaptomus alpinus was an important prey item for adult and larval alpine newts. During the second half of their aquatic period, adult newts moved to deeper water where the copepod reached its highest densities near the sediment. Adults and larvae exhibited no periodic feeding pattern. The feeding rhythm was more synchronized among the larvae than among the adults.3. Daily food consumption, estimated using the Elliott & Persson (1978) model, reached 4–21 mg dry biomass in adults. The daily ration of larvae was about 7% of body dry weight in the temperature range 6-11°C. Compared to published estimates of daily food consumption in salmonid fishes, the feeding pressure of newts appears low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1995.tb00385.x
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution and ecology of rotifer communities in high-altitude alpine sites — a multivariate approach (1995)
    Springer
    Hydrobiologia 313-314 (1995), S. 75-89 
    Details
    ISSN: 1573-5117
    Keywords: rotifer communities ; habitat preference ; species diversity ; Austrian Alps ; minimum variance clustering ; principal component analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution and ecology of benthic, periphytic and planktonic rotifers were investigated in a wide range of alpine waterbodies in Austria. A total of 162 substrate classified samples was taken at 60 sampling sites situated between 1824 m and 2753 m a.s.l. in the Central Alps (predominantly gneiss) and between 1290 m and 1643 m a.s.l. in the Northeastern Calcareous Alps. Multivariate analysis allowed the recognition of distinct sampling site groups. Different groups of taxa were identified on the basis of their total frequencies of occurrence and frequency of co-occurrence. Several species were shown to have distributions restricted to particular groups of habitats. Habitat complexity, as indicated by taxon diversity and density of submersed vegetation, pH, conductivity, and temperature seem to be the principal components affecting community composition and distribution of single species in alpine waterbodies. Highest diversities were measured in limestone solution lakes and acid bog ponds on primary bedrock.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025934
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  • 3
    Electronic Resource
    Electronic Resource
    Encentrum (Parencentrum) walterkostei n. sp., a new dicranophorid rotifer (Rotatoria: Monogononta) from the high alpine zone of the Central Alps (Austria) (1990)
    Springer
    Hydrobiologia 281 (1990), S. 51-56 
    Details
    ISSN: 1573-5117
    Keywords: Encentrum ; Dicranophoridae ; alpine rotifers ; psammon ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new dicranophorid rotifer, Encentrum (Parencentrum) walterkostei n.sp., is described from an oligotrophic alpine lake. The species was abundant in the psammolittoral of the ‘Unterer Schwarzhornsee’, 2543 m above sea level. The main distinguishing taxonomic features of the new species are long, swordshaped toes and only four vitellary nuclei. Its known occurrence in the sandy substrate of only one lake suggests a stenobiontic nature of this apparently oligothermic new species. Taxonomic problems associated with the Encentrum/Dicranophorus group are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006555
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  • 4
    Electronic Resource
    Electronic Resource
    Additional notes on taxonomy and ecology of Anuraeopsis miracleae Koste, 1991 (Rotatoria:Monogononta) from an Austrian alpine lake (1993)
    Springer
    Hydrobiologia 264 (1993), S. 55-60 
    Details
    ISSN: 1573-5117
    Keywords: Anuraeopsis ; nomenclature ; morphology ; ecology ; Weber's organ ; egg-carrying
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Although closely resembling Anuraeopsis fissa, Anuraeopsis miracleae constitutes a well defined species, being more highly adapted to microaerobic, cold environments. Our observations on the Austrian population are compared with information available on specimens from the type locality in Spain. Morphological discrepancies, especially concerning characteristics of Weber's organ and shape of the eggs are described and discussed. General ecological features indicate that the species is not restricted to meromictic or stratified lakes. To agree with the provisions of the International Code of Zoological Nomenclature the original spelling of A. miraclei Koste, 1991 is emended to A. miracleae Koste, 1991.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014664
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  • 5
    Electronic Resource
    Electronic Resource
    Dicranophoridae (Rotifera) from the Alps (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 63-77 
    Details
    ISSN: 1573-5117
    Keywords: Dicranophoridae ; Austria ; alpine water bodies ; taxonomy ; biogeography ; ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rotifera of the family Dicranophoridae Harring, 1913 were recorded from mountainous altitudes of the Austrian Alps. Here, their morphology, distribution and ecology is detailed. The description of Encentrum walterkostei Jersabek is amended by observations on living animals. Of 19 species encountered, all but four are new to the alpine region, nine species are first records for the biogeographic region 'Alps'. Four species are new to science and will be published elsewhere. The majority are cosmopolites or widely distributed taxa, but also species with a more limited range, possibly endemics, seem to exist. Most species can be characterized as being more commonly found in cold environments, some of them are known to be psammobiontic or psammophilic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017017120656
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Dicranophoridae (Rotifera) from the Alps (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 63-77 
    Details
    ISSN: 1573-5117
    Keywords: Dicranophoridae ; Austria ; alpine water bodies ; taxonomy ; biogeography ; ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rotifera of the family Dicranophoridae Harring, 1913 were recorded from mountainous altitudes of the Austrian Alps. Here, their morphology, distribution and ecology is detailed. The description of Encentrum walterkostei Jersabek is amended by observations on living animals. Of 19 species encountered, all but four are new to the alpine region, nine species are first records for the biogeographic region 'Alps'. Four species are new to science and will be published elsewhere. The majority are cosmopolites or widely distributed taxa, but also species with a more limited range, possibly endemics, seem to exist. Most species can be characterized as being more commonly found in cold environments, some of them are known to be psammobiontic or psammophilic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017017120656
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    Paper (German National Licenses)
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