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  • food resources  (2)
  • Southern Andes  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Summer population of Hexarthra bulgarica in a high elevation lake of south Andes (1993)
    Springer
    Hydrobiologia 259 (1993), S. 33-37 
    Details
    ISSN: 1573-5117
    Keywords: Hexarthra bulgarica ; high-elevation lake ; copepod predation ; Southern Andes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A Hexarthra bulgarica population was studied over one summer in a high-elevation lake of the southern Andes. A brief description of specimens is included. The zooplankton is composed of this species and the calanoid copepod Pseudoboeckella gibbosa. The lake lacks vertebrate predators. Analysis of Pseudoboeckella guts showed that its omnivorous diet included Hexarthra. A biogeographical comparison is made between this and other American high-elevation lakes. It is concluded that the Hexarthra population is controlled by predation and by extreme abiotic conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005962
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of abiotic and biotic factors on morphological variation of Keratella cochlearis (Gosse) in a small Andean lake (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 289-294 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; Keratella cochlearis ; morphological variation ; food resources
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Morphological variation of Keratella cochlearis was studied during a spring-summer period in a small Andean lake. Morphometry was studied in relation to temperature, food resources, cladoceran competitors and invertebrate predators. Three different morphs were recorded. We observed lack of allometric growth of the posterior spine. Absence of allometric growth could be related with the low density of a predaceous water mite and the small size of the cladocerans present in the lake. Fluctuations in lorica length and width were negatively correlated with temperature and algal biovolume. We discuss the benefits of this morphological response of Keratella in relation to environmental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017003029568
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of abiotic and biotic factors on morphological variation of Keratella cochlearis (Gosse) in a small Andean lake (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 289-294 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; Keratella cochlearis ; morphological variation ; food resources
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Morphological variation of Keratella cochlearis was studied during a spring-summer period in a small Andean lake. Morphometry was studied in relation to temperature, food resources, cladoceran competitors and invertebrate predators. Three different morphs were recorded. We observed lack of allometric growth of the posterior spine. Absence of allometric growth could be related with the low density of a predaceous water mite and the small size of the cladocerans present in the lake. Fluctuations in lorica length and width were negatively correlated with temperature and algal biovolume. We discuss the benefits of this morphological response of Keratella in relation to environmental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017003029568
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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