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  • Electronic Resource  (3)
  • 1995-1999  (3)
  • 1985-1989
  • 1996  (3)
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  • Electronic Resource  (3)
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  • 1995-1999  (3)
  • 1985-1989
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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of gut contents of Gomphiocephalus hodgsoni Carpenter (Collembola: Hypogastruridae) at Cape Geology, Antarctica (1996)
    Springer
    Polar biology 16 (1996), S. 463-467 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The diet of the collembolan Gomphiocephalus hodgsoni was investigated by microscopic examination of the contents of 197 faecal pellets and 32 guts collected at Cape Geology, Victoria Land, Antarctica. Animals came from nine contrasting microhabitats, ranging from mineral soils to bryophyte cushions. Thirty-two different types of ingested material were recognised. Detritus, filamentous cyanobacteria, eukaryotic microalgae and fungal hyphae were the most frequent. There were marked contrasts between individuals collected from different microhabitats, which probably reflected food availability. There was some selectivity in that neither living moss tissue nor the macroscopic chlorophyte alga Prasiola crispa was encountered in faeces or guts, despite their being abundant in some microhabitats. A comparison of active and inactive animals showed the latter to have a significantly higher proportion of empty guts and of guts containing fat globules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050076
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Analysis of gut contents ofGomphiocephalus hodgsoni carpenter (collembola: Hypogastruridae) at Cape Geology, Antarctica (1996)
    Springer
    Polar biology 16 (1996), S. 463-467 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The diet of the collembolanGomphiocephalus hodgsoni was investigated by microscopic examination of the contents of 197 faecal pellets and 32 guts collected at Cape Geology, Victoria Land, Antarctica. Animals came from nine contrasting microhabitats, ranging from mineral soils to bryophyte cushions. Thirty-two different types of ingested material were recognised. Detritus, filamentous cyanobacteria, eukaryotic microalgae and fungal hyphae were the most frequent. There were marked contrasts between individuals collected from different microhabitats, which probably reflected food availability. There was some selectivity in that neither living moss tissue nor the macroscopic chlorophyte algaPrasiola crispa was encountered in faeces or guts, despite their being abundant in some microhabitats. A comparison of active and inactive animals showed the latter to have a significantly higher proportion of empty guts and of guts containing fat globules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02329064
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Stability of the extreme point set of a polyhedron (1996)
    Springer
    Journal of optimization theory and applications 90 (1996), S. 357-380 
    Details
    ISSN: 1573-2878
    Keywords: Polyhedral sets ; extreme points ; multivalued maps ; continuity ; stability ; linear programming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper is focused on the stability properties of the extreme point set of a polyhedron. We consider a polyhedral setX(A,b) which is defined by a linear system of equality and inequality constraintsAx≤b, where the matrixA and the right-hand sideb are subject to perturbations. The extreme point setE(X(A,b)) of the polyhedronX(A,b) defines a multivalued map ℳ:(A,b)→E(X(A,b)). In the paper, characterization of continuity and Lipschitz continuity of the map ℳ is obtained. Boundedness of the setX(A,b) is not assumed It is shown that lower Lipschitz continuity is equivalent to the lower semicontinuity of the map ℳ and to the Robinson and Mangasarian-Fromovitz constraint qualifications. Upper Lipschitz continuity is proved to be equivalent to the upper semicontinuity of the map ℳ. It appears that the upper semicontinuity of the map ℳ implies the lower semicontinuity of this map. Some examples of using the conditions obtained are provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02190003
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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