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  • Bosmina  (1)
  • 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
    Evidence of interference of Asterionella formosa with the feeding of Bosmina longirostris: a field study in a south Andes lake (1991)
    Springer
    Hydrobiologia 224 (1991), S. 111-116 
    Details
    ISSN: 1573-5117
    Keywords: plankton ; feeding interference ; Bosmina ; Asterionella ; south Andes lake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intensive sampling of a small temperate lake of the Araucanian region (Argentina), revealed changes in the demography of Bosmina longirostris when the diatom Asterionella formosa density increased (to 54 000 cells ml−1). Bosmina population behaviour in the field was consistent with the idea that large numbers of Asterionella caused its starvation. Individuals were actually colourless and fecundity dropped to zero, as was evident when Asterionella reached 99.4% of total phytoplankton biovolume. Since cyanophytes, as a whole, are scarce in these lakes, we propose that the flagellate/diatom ratio has a direct effect on cladoceran demography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006867
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    Paper (German National Licenses)
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