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  • Articles: DFG German National Licenses  (6)
  • taxonomy  (3)
  • population growth  (2)
  • Africa  (1)
Source
  • Articles: DFG German National Licenses  (6)
Material
Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Demography and population growth of Asplanchna girodi (Rotifera) as a function of prey (Anuraeopsis fissa) density (1995)
    Springer
    Hydrobiologia 306 (1995), S. 97-107 
    Details
    ISSN: 1573-5117
    Keywords: prey-predator interaction ; population growth ; mortality ; rotifers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory studies on population growth and life table demography of Asplanchna girodi were conducted at 25±1 °c using Anuraeopsis fissa as prey at four (250, 500, 1000 and 2000 ind ml−1) densities. A prey density of 100 ind ml−1 per predator per day did not support A. girodi, while at the highest prey concentration, A. girodi reached a peak of 115±7 ind ml−1. The age distribution of A. girodi indicated that non-adults constituted about 2/3rd of the population at all prey concentrations. A decrease in prey availability resulted in increased mortality of non-adults. At the highest prey density, the rate of population increase (r) was 1.51 d−1. The significance of estimating mortality in population growth studies is discussed. Life table demography of A. girodi was also studied using the same prey at the same concentrations. None of the survivorship parameters (e.g. mean lifespan and mean survivorship) showed a significant relation to prey density. Net reproductive rate and generation time (but not rate of population increase) were affected by prey abundance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016827
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Workshop on taxonomy and biogeography (1980)
    Springer
    Hydrobiologia 73 (1980), S. 205-206 
    Details
    ISSN: 1573-5117
    Keywords: species concept ; taxonomy ; global distribution ; passive dispersal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019448
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Feeding preference and population growth of Asplanchna brightwelli (Rotifera) offered two non-evasive prey rotifers (1997)
    Springer
    Hydrobiologia 361 (1997), S. 77-88 
    Details
    ISSN: 1573-5117
    Keywords: Rotifer ; biomass ; predation ; population growth ; handlingtime
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Population growth rates of the predatory rotifer Asplanchna brightwelli were determined at 25 °C using a large (Brachionus calyciflorus) and a small (Anuraeopsis fissa) rotifer prey species in three concentrations (0.5, 0.1 and 2.0 μg dry weight ml-1) and in five combinations. The prey ingestion time by the predator was also measured. For B. calyciflorus the ingestion time (22.97–8.95 s) was more than six times that of A. fissa (3.68 ± 0.93). Regardless of prey type, the population growth of Asplanchna increased with increasing food density. There was a direct correlation between densities of amictic and mictic fernales. The maximum rate of population growth (1.01 ± 0.10 d-1) was higher at high density of A. fissa prey than that at the same density of B. calyciflorus. Progressive increase of A. fissa density in the offered food combination resulted in a corresponding increase of the predator's number. Gut content analysis of A. brightwelli revealed that the number of prey ingested increased with increasing prey densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003189312452
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On the taxonomy of the Brachionidae: description of Plationus n. gen. (Rotifera, Monogononta) (1993)
    Springer
    Hydrobiologia 268 (1993), S. 1-8 
    Details
    ISSN: 1573-5117
    Keywords: taxonomy ; S.E.M. ; Rotifera ; Plationus n. gen.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Based on S.E.M. studies of trophi, the generic diagnosis of Brachionus Pallas and Platyias Harring is refined. Plationus n. gen. is erected to accommodate the former B. patulus-group. Platyias latiscapularis is elevated to full specific rank.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005736
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Discovery of groundwater-inhabiting Chydoridae (Crustacea: Cladocera), with the description of two new species (1983)
    Springer
    Hydrobiologia 106 (1983), S. 97-106 
    Details
    ISSN: 1573-5117
    Keywords: Cladocera ; Chydoridae ; taxonomy ; groundwater ; France
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The groundwater along the Couze (= river) Pavin in Auvergne, France, yielded four chydorid Cladocera, among which two are known but rare species, while two are new species. One of the new species, Alona phreatica, has reduced eye and ocellus-sizes, but no other adaptations to a groundwater-mode of life are apparent. The likelihood that more phreatic species exist in other parts of Europe and elsewhere is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006741
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Faunal composition and biogeography of the calanoid copepods of West-Darfur, Sudan, with the description of Tropodiaptomus asimi n. sp. (1989)
    Springer
    Hydrobiologia 179 (1989), S. 195-203 
    Details
    ISSN: 1573-5117
    Keywords: Diaptomids ; Tropodiaptomus ; Sudan ; Africa ; biogeography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Four calanoid species found in Darfur, Western Sudan, all belong to previously known Nile Valley elements, but had not been reported from its Western sector. One species is morphologically characterized and given a new name. Another had been found on the East African Plateau and in the Chad basin only. It is now recorded from an intermediate locality as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006632
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    Paper (German National Licenses)
    Fulltext
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