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  • 14.80.Pb  (1)
  • Anchihaline  (1)
  • Benthic insects  (1)
  • Springer  (3)
  • American Institute of Physics
  • American Meteorological Society (AMS)
  • 2010-2014
  • 1990-1994  (3)
  • 1955-1959
  • 1950-1954
  • 1940-1944
  • 1935-1939
Collection
Keywords
Publisher
  • Springer  (3)
  • American Institute of Physics
  • American Meteorological Society (AMS)
Years
  • 2010-2014
  • 1990-1994  (3)
  • 1955-1959
  • 1950-1954
  • 1940-1944
    • +
Year
  • 1
    Electronic Resource
    Electronic Resource
    Bhabha to Møller cross section ratios in the energy range 2.15–2.45 MeV (1993)
    Springer
    The European physical journal 345 (1993), S. 79-88 
    Details
    ISSN: 1434-601X
    Keywords: 12.20.Fv ; 13.10.+q ; 14.80.Pb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The cross sections for Bhabha and Møller scattering have been investigated in the energy range 2.1–2.4 MeV using monoenergetic positrons and electrons to search for hypothetical resonances superimposed to the continuum predicted by quantum electro dynamics. Bhabba-to-Mott, Møller-to-Mott and Møller-to-Bhabha cross section ratios were measured. The Bhabha-to-Mott ratios could be determined with statistical errors of typically 1% and remaining systematic errors not exceeding the statistical ones. No resonances in Bhabha scattering were observed. Limits for the intrinsic widths of hypothetical resonances are given. For the first time upper limits are deduced from our data for hypothetical resonances in the Møller scattering cross section in the MeV range. Additionally, Møller-to-Bhabha cross section ratios could be determined with good precision. A good agreement between the experimental and theoretical Møller-to-Bhabha ratios can be stated calling in question the recently predicted existence of series of narrow, unresolvable resonances in the Bhabha scattering cross section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290343
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  • 2
    Electronic Resource
    Electronic Resource
    Biogeographic synthesis of the insular groundwater faunas of the (sub)tropical Atlantic (1994)
    Springer
    Hydrobiologia 287 (1994), S. 105-117 
    Details
    ISSN: 1573-5117
    Keywords: Anchihaline ; Tethys ; subterranean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Anchihaline habitats occur most frequently in subsiding areas. Typically, they are populated by ancestors of marine origin. These ancestral forms have a much wider distribution in the open sea, thus their hypogean descendents occur in phenetically similar populations on various islands. On the contrary, on rising islands, marine ancestors stranded during the uplift and got isolated in brackish or fresh ground waters, giving rise to phenetic and genetic isolates in very restricted areas. They belong to old genera with a large ditribution (amphi-Atlantic or Tethyan) The stygofaunas of both rising and subsiding areas thus originated in the sea, but contrary to the often uttered suggestions, not in the deep-sea. Phenetic resemblance between deep-sea and anchihaline taxa may indicate common ancestry, but then it must be shallow-water ancestry for both, simply because no deep-sea species survived the two oxygen-crises in the early and mid-Tertiary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006900
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  • 3
    Electronic Resource
    Electronic Resource
    Short-term effects of a catastrophic beaver dam collapse on a stream fish community (1991)
    Springer
    Environmental biology of fishes 31 (1991), S. 123-129 
    Details
    ISSN: 1573-5133
    Keywords: Benthic insects ; Colonization dynamics ; Disturbance ; Floods ; Landscape ecology ; Minnesota
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis We examined the short-term effects of the natural catastrophic collapse of a beaver dam on downstream benthic insect density and fish community structure in a headwater tributary of the Mississippi River. The catastrophic collapse of the dam and ensuing flash flood resulted in a dramatic (〈 90%) decrease in benthic insect density in riffle and pool habitats. Sixty days after collapse of the dam, insect densities in riffles were 62% of pre-collapse densities. Insect recolonization of pools was slower than for riffles; 60 days after collapse of the dam insect densities in pools were 8% of pre-collapse levels. Collapse of the beaver dam altered the structure of the downstream fish community by causing a short-term (2–4 days) influx of pond species, resulting in a brief increase in species richness and abundance. Fish species richness and abundance then decreased for 4–60 days to levels below those prior to the collapse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00001012
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